{"id":18991,"date":"2025-07-07T10:18:14","date_gmt":"2025-07-07T09:18:14","guid":{"rendered":"https:\/\/www.hawkins.biz\/?post_type=insight&#038;p=18991"},"modified":"2025-08-07T11:00:17","modified_gmt":"2025-08-07T10:00:17","slug":"failure-investigation-of-frp-composite-parts","status":"publish","type":"insight","link":"https:\/\/www.hawkins.biz\/insight\/failure-investigation-of-frp-composite-parts\/","title":{"rendered":"Failure Investigation of FRP Composite Parts"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"18991\" class=\"elementor elementor-18991\" data-elementor-post-type=\"insight\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-d865d26 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"84869\" data-id=\"d865d26\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-57003cb\" data-eae-slider=\"58218\" data-id=\"57003cb\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a7e512f elementor-widget elementor-widget-text-editor\" data-id=\"a7e512f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A Fibre Reinforced Polymer (FRP) composite, is a composite material wherein a polymer is reinforced with fibres. An FRP composite is made of two or more materials, one that forms a continuous phase (i.e. resin matrix) and a secondary material that acts as reinforcement (i.e. continuous or short fibres). it is necessary to have the reinforcing material fully encapsulated by the matrix. As such, an engineering composite is considered a heterogeneous material, i.e. constructed of two or more distinct constituents\/phases.<\/p><p>Their excellent properties have seen them become an appealing engineering material due to their high strength-to-weight ratios, high modulus (only slightly changing shape under elastic load), magnetism and corrosion resistance. The fibres used include carbon fibre, glass fibre, boron fibre, and aramid fibres, which can be either continuous or short fibres. The resin matrices used are mainly thermosetting resin and thermoplastic resin.<\/p><p>A single layer of fibres embedded with resin is called a lamina, and a composite part is made of stacking many of these laminas on top of one another, in different directions\/orientations. Generally speaking, fibres are aligned in the direction of the load in the structure. Consequently, FRP composite structures are highly tailored structures whereby the fibre direction and the number of laminas at each location of the structure, can impart specific strength and stiffness requirements. This tailored approach and the high strength of fibres compared to some homogeneous materials (e,g. steel), provides significant weight-saving benefits for the composite structures.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a00e282 elementor-widget elementor-widget-text-editor\" data-id=\"a00e282\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><span style=\"color: #0a527a;\">Composite Manufacturing Methods<\/span><\/h4><p>There are several different methods for manufacturing composite parts, however, they tend to fall into one of two groups:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-afdb9a3 elementor-align-left elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"afdb9a3\" data-element_type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Use of dry fibres and addition of the resin in the process of manufacturing<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Use of pre-impregnated fibres (prepreg)<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-953765e elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"953765e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The manufacturing cost for methods using dry fibres is normally lower than those using prepreg. However, parts made from prepreg normally have a higher fibre volume fraction (i.e. the number of fibres in a defined volume of composite).<\/p>\n<p>Some of the methods using dry fibres and resin include;<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fb91eb8 elementor-align-left elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"fb91eb8\" data-element_type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Wet layup<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Vacuum infusion<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Resin transfer moulding (RTM)<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Vacuum-assisted RTM<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Braiding<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7d6fb99 elementor-widget elementor-widget-text-editor\" data-id=\"7d6fb99\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Examples of prepreg methods incude;<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7d3d0e2 elementor-align-left elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"7d3d0e2\" data-element_type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Filament winding<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Tape placement<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-91041ba elementor-widget elementor-widget-text-editor\" data-id=\"91041ba\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>After producing the shape required for the part (or getting as close as possible to it) the resin matrix needs to be cured. Curing results in the solidification of the resin, which enables it to keep its shape after being removed from the mould. The curing process is a chemical reaction involving the cross-linking of polymer molecules, which ultimately solidifies the polymer. The crosslinking speed has a direct relation to the energy provided to the resin, hence most of the parts are subjected to heat to cure the resin in a reasonable length of time.<\/p><p>The layered structure of composites also means that the quality of the part can be heavily influenced by the manufacturing process and machinery used. Any wrap or wrinkle in fibres and\/or misalignment in the fibres before the structure is cured will reduce the load bearing capacity of the structure. The introduction of contaminants, such as dust particles, between the layers at the time of manufacturing may also compromise the mechanical integrity of the composite, resulting in a defective structure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d6422fc elementor-widget elementor-widget-text-editor\" data-id=\"d6422fc\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-5b051e9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5b051e9\" data-element_type=\"section\"><div class=\"elementor-container elementor-column-gap-default\"><div class=\"has_eae_slider elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-68e6efb\" data-id=\"68e6efb\" data-element_type=\"column\"><div class=\"elementor-widget-wrap elementor-element-populated\"><div class=\"elementor-element elementor-element-925c64b elementor-widget elementor-widget-text-editor\" data-id=\"925c64b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\"><div class=\"elementor-widget-container\"><h4><span style=\"color: #0a527a;\">Composite Failure Modes<\/span><\/h4><p>Composite materials derive many of their advantages from their anisotropy (different directions of fibre within the matrix structure). However, this feature also gives rise to complicated three-dimensional states of stress at cut-outs, notches and cracks. Another factor that makes the description of composite failure difficult is their heterogeneity. In other words, the composite is made of individual ply, which themselves are composed of different fibres and matrix. Thus, when a global failure occurs, the propagation of any damage occurs via a mechanism that is only similar to a crack in the global sense. Some of the failures seen in composites are;<\/p><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f9faa18 elementor-align-left elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"f9faa18\" data-element_type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Matrix cracking<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Fibre breakage<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Debonding<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Transverse-ply cracking<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"8.305\" height=\"15.142\" viewBox=\"0 0 8.305 15.142\"><path id=\"Path_185\" data-name=\"Path 185\" d=\"M0,0,5.536,7.572,0,15.143H2.768L8.3,7.572,2.768,0Z\" transform=\"translate(0 0)\" fill=\"#007aa3\" opacity=\"0.998\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Interface cracking<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-e653e27 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"89571\" data-id=\"e653e27\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-cf762b0\" data-eae-slider=\"62937\" data-id=\"cf762b0\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fcb4ff5 elementor-widget elementor-widget-text-editor\" data-id=\"fcb4ff5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In composite failures, it is rare to come across one single failure mode, and in most cases, the failure is a combination of the modes listed above. In addition, due to the layered structure of FRP composites, the failure may not be visible on the surface of the part, or the visible damage may be much smaller than the actual fault inside the structure. A good example is impact damage. In these cases, the surface may present a very small indentation, sometimes barely visible to the naked eye. However, the delamination produced beneath the surface would be larger in size and depth by several orders of magnitude.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4391760 elementor-widget elementor-widget-image\" data-id=\"4391760\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"517\" src=\"https:\/\/www.hawkins.biz\/wp-content\/uploads\/2025\/01\/Picture2.png\" class=\"attachment-large size-large wp-image-35902\" alt=\"amir hajdaei image\" srcset=\"https:\/\/www.hawkins.biz\/wp-content\/uploads\/2025\/01\/Picture2.png 1017w, https:\/\/www.hawkins.biz\/wp-content\/uploads\/2025\/01\/Picture2-300x194.png 300w, https:\/\/www.hawkins.biz\/wp-content\/uploads\/2025\/01\/Picture2-768x496.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Catastrophic failure of a pressurised water tank<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9ce3e2d elementor-widget elementor-widget-text-editor\" data-id=\"9ce3e2d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-5b051e9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5b051e9\" data-element_type=\"section\"><div class=\"elementor-container elementor-column-gap-default\"><div class=\"has_eae_slider elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-68e6efb\" data-id=\"68e6efb\" data-element_type=\"column\"><div class=\"elementor-widget-wrap elementor-element-populated\"><div class=\"elementor-element elementor-element-925c64b elementor-widget elementor-widget-text-editor\" data-id=\"925c64b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\"><div class=\"elementor-widget-container\"><h4><span style=\"color: #0a527a;\">Composite Failure Investigation<\/span><\/h4><p>To conduct failure analysis on composite materials, not only do we need to consider the heterogeneity and directional nature of the material itself, but also their compatibility with the environment the part was working in. For example, some polymers degrade because of exposure to UV and become brittle over time. This in turn will ease crack propagation in the structure and may also further expose the fibres to the environment.<\/p><p>Design details of composite structures such as the location of the cut-outs and holes, ply drops and corners, play a vital role in defining the areas of stress concentration and those that are susceptible to damage initiation.<\/p><p>Other details such as the manufacturing method, installation\/service history and geographical location of the component, are all important factors that need to be considered and understood thoroughly before a determination of the failure can be reached.<\/p><p>As with any forensic investigation, the preservation of evidence is critical, and the failed part containing any fracture surfaces must be retained and kept safe until it can be examined. The most vital source of information, as with the failure analysis of any engineering material, is the area in which the crack initiated and propagated.<\/p><p>Composites are relatively brittle materials and contact between fracture surfaces after failure can result in losing important forensic detail due to abrasion, and therefore special attention needs to be given to ensuring the integrity of the fracture surfaces post-failure.<\/p><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2371922 elementor-widget elementor-widget-text-editor\" data-id=\"2371922\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-5b051e9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5b051e9\" data-element_type=\"section\"><div class=\"elementor-container elementor-column-gap-default\"><div class=\"has_eae_slider elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-68e6efb\" data-id=\"68e6efb\" data-element_type=\"column\"><div class=\"elementor-widget-wrap elementor-element-populated\"><div class=\"elementor-element elementor-element-925c64b elementor-widget elementor-widget-text-editor\" data-id=\"925c64b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\"><div class=\"elementor-widget-container\"><h4><span style=\"color: #0a527a;\">About the Author<\/span><\/h4><p>Materials engineer, <a href=\"https:\/\/www.hawkins.biz\/experts\/amir-hajdaei\/\">Dr Amir Hajdaei<\/a> has extensive experience in dealing with a wide range of materials including metals and <a href=\"https:\/\/www.hawkins.biz\/expertise\/materials-chemistry-biology\/glass-ceramics\/\">ceramics<\/a> and has an in-depth knowledge of fibre reinforced<a href=\"https:\/\/www.hawkins.biz\/expertise\/materials-chemistry-biology\/composites\/\"> composites<\/a> and <a href=\"https:\/\/www.hawkins.biz\/expertise\/materials-chemistry-biology\/plastics-polymers\/\">polymers<\/a>.<\/p><p>After completing his PhD at the University of Manchester, Amir worked as a principal composite engineer, testing composite materials and parts for wind, oil and gas and aerospace industries. This made use of his knowledge of the mechanical properties of fibre reinforced composites and specialism in\u00a0<span style=\"background-color: initial;\">time-dependent properties, such as fatigue and creep\/stress rupture.<\/span><\/p><p>With over fifteen years of experience working on fibre reinforced composites, polymers and adhesive bonded joints, Amir has a thorough understanding of composite manufacturing methods, as well as composites and polymer failure mechanisms.<\/p><p>If you have a materials failure that you would like Amir, or any of our other materials engineers to investigate,<a href=\"https:\/\/www.hawkins.biz\/contact\/\"> get in touch.<\/a><\/p><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a932c4e elementor-widget elementor-widget-spacer\" data-id=\"a932c4e\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>In this article, Amir will discuss what a Fibre Reinforced Polymer is, how they are made and how their failures can lead to catastrophic loss.<\/p>\n","protected":false},"featured_media":13872,"parent":0,"template":"","insight_category":[],"experties":[68],"class_list":["post-18991","insight","type-insight","status-publish","has-post-thumbnail","hentry","experties-materials-chemistry-biology"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FRP Composite Failures: Causes &amp; Forensic Insights<\/title>\n<meta name=\"description\" content=\"Learn how forensic experts investigate failures in Fibre Reinforced Polymer (FRP) parts, exploring causes from design flaws to material defects.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hawkins.biz\/insight\/failure-investigation-of-frp-composite-parts\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FRP Composite Failures: Causes &amp; Forensic Insights\" \/>\n<meta property=\"og:description\" content=\"Learn how forensic experts investigate failures in Fibre Reinforced Polymer (FRP) parts, exploring causes from design flaws to material defects.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.hawkins.biz\/insight\/failure-investigation-of-frp-composite-parts\/\" \/>\n<meta property=\"og:site_name\" content=\"Hawkins Forensic Investigation\" \/>\n<meta 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