{"id":11913,"date":"2026-03-17T15:35:14","date_gmt":"2026-03-17T14:35:14","guid":{"rendered":"https:\/\/ikv-aachen.de\/student-research-theses\/development-of-a-material-specific-multiaxial-failure-criterion-for-short-fiber-reinforced-thermoplastics\/"},"modified":"2026-03-18T10:50:55","modified_gmt":"2026-03-18T09:50:55","slug":"development-of-a-material-specific-multiaxial-failure-criterion-for-short-fiber-reinforced-thermoplastics","status":"publish","type":"cpt_ikv_srt","link":"https:\/\/ikv-aachen.de\/en\/student-research-theses\/development-of-a-material-specific-multiaxial-failure-criterion-for-short-fiber-reinforced-thermoplastics\/","title":{"rendered":"Development of a material-specific multiaxial failure criterion for short-fiber-reinforced thermoplastics"},"content":{"rendered":"<style type=\"text\/css\">\n    #single-header-block_d1f8fbba33152bf296141ff92f12e258 .swiperThumbsNavi .swiper-slide {\n        opacity: 0.4;\n    }\n\n    #single-header-block_d1f8fbba33152bf296141ff92f12e258 .swiperThumbsNavi .swiper-slide-thumb-active {\n        opacity: 1;\n    }\n<\/style>\n    <section id=\"single-header-block_d1f8fbba33152bf296141ff92f12e258\" class=\"block-single-header theGridWrapper \">\n        <div class=\"theGrid12\">\n            <div class=\" col-start-2 col-span-10 md:col-start-3  md:col-span-8\">\n                <h2 class=\"font-serif font-semibold text-blue text-sm w-4\/5\">\n                    Bachelor&#8217;s thesis or master&#8217;s thesis                <\/h2>\n                                                    <div class=\"skewToMiddle\">\n                        <div class=\"relative  text-blue text-sm font after:border-2  after:border-blue rounded-xl bg-green-lighter  p-base -rotate-6 my-xl  after:block after:absolute after:w-full after:h-full after: after:-z-10 after:rounded-xl after:rotate-1  after:box-content  after:-top-2xs after:-left-2xs after:bg-blend-multiply  leading-snug \">\n                            <div class=\"skewToMiddleInner\">\n                                Develop a multiaxial failure criterion for short-fiber-reinforced thermoplastics using novel injection molding and testing methods                            <\/div>\n                        <\/div>\n                    <\/div>\n                            <\/div>\n        <\/div>\n    <\/section>\n\n\n<figure class=\" relative flex flex-col gap-2xs mb-xs md:mb-l xl:mb-xl\"><img decoding=\"async\"  class=\" w-full  \"  src=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/03\/Stuwi-Entwicklung-eines-werkstoffgerechten-multiaxialen-Versagenskriteriums-fuer-kurzfaserverstaerkte-Thermoplaste-2.jpg\" srcset=\"https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/03\/Stuwi-Entwicklung-eines-werkstoffgerechten-multiaxialen-Versagenskriteriums-fuer-kurzfaserverstaerkte-Thermoplaste-2-748x499.jpg 748w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/03\/Stuwi-Entwicklung-eines-werkstoffgerechten-multiaxialen-Versagenskriteriums-fuer-kurzfaserverstaerkte-Thermoplaste-2-1536x1024.jpg 1536w, https:\/\/ikv-aachen.de\/wp-content\/uploads\/2026\/03\/Stuwi-Entwicklung-eines-werkstoffgerechten-multiaxialen-Versagenskriteriums-fuer-kurzfaserverstaerkte-Thermoplaste-2-768x512.jpg 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" width=\"1536\" height=\"1024\" alt=\"Stuwi-Entwicklung eines werkstoffgerechten multiaxialen Versagenskriteriums f\u00fcr kurzfaserverst\u00e4rkte Thermoplaste\" loading=\"lazy\" \/><span class=\" text-copyright order-3 justify-end text-right w-full  w-full \">&copy; IKV<\/span><figcaption class=\" w-full  text-figcaption justify-end text-right \">A novel injection moulding tool enables the production of highly oriented tubular test specimens made from fibre-reinforced thermoplastics (top right). \nThis allows material characterisation in tensile-compression-torsion testing (left) to be carried out in a manner appropriate to the material. \nThe strain on the specimen surface is recorded using video extensometry (bottom right).<\/figcaption><\/figure>\n\n\n<h3 class=\"wp-block-heading\">Topic of the work:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Short-fiber-reinforced thermoplastics are characterized by excellent processing properties. Fiber reinforcement can significantly increase mechanical properties such as stiffness and strength, resulting in great potential to increasingly replace metals as a construction material in structural applications. In these fields of application, combined stresses often occur, which change the relevant strength parameters. The theories established to describe strength were mainly derived in the 1970s and are based on the manufacturing and production processes available for this class of materials at the time. However, current investigations show that these approaches can only approximate the strength behavior under combined stresses. As a result, high safety factors are often applied when designing components, so that part of the material potential remains unused. Recent developments in the working group enable a material-specific experimental investigation of the strength behavior of short-fiber-reinforced thermoplastics under combined stresses and thus create the basis for improved design practice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The work is related to this research project:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The work takes up an open scientific question that deals with the failure mechanisms of short-fiber-reinforced plastics under combined stresses. In particular, the varying fiber orientation over the component thickness currently makes it difficult to reliably predict the failure behavior. This results in either premature component failure or material-intensive oversizing. The aim of the work is to investigate the failure experimentally and to create the basis for improved dimensioning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Objective:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Based on preliminary developments, a prototype of an injection mould was developed that will make it possible in future to achieve a homogeneous, highly oriented fiber orientation distribution in tube specimens close to series production. The prototype of a test method was also designed in line with this, with which any uniaxial and multiaxial stress states can be set. The aim of your work is to transfer these two new processes into an integrated manufacturing and testing concept. For this purpose, pipe test specimens are first produced by injection molding and the homogeneous, highly oriented fiber orientation is ensured by specific process adjustments. This is followed by uniaxial material testing for the targeted induction of normal and shear stresses using the new test method. The resulting stress state is checked and the test system is technically adapted if necessary. Finally, combined tests are carried out to determine the multiaxial strengths.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Your task:<\/h3>\n\n\n<style type=\"text\/css\">#table-from-csv-block_65fc0287863e273cb4353a9de9ab5ce5 table:not(thead) td:before { content: attr(data-col-name); }\n<\/style><section id=\"table-from-csv-block_65fc0287863e273cb4353a9de9ab5ce5\" class=\"block-table-from-csv theGridWrapper  text-sm   \">\n\n<table class='w-full gap-xs hyphens-none text-wrap '>\n\n<thead class='font-semibold font-serif hidden text-blue  lg:table-row-group'>\n\t<tr class=' flex flex-col mt-xs lg:border-t border-dashed first:border-none lg:border-white lg:table-row tableToNormal   '>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Bachelor's thesis, you will work on the following tasks ' >For a Bachelor&#039;s thesis, you will work on the following tasks <\/td>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Master's thesis, you will work on the following tasks' >For a Master&#039;s thesis, you will work on the following tasks<\/td>\n<\/tr>\n<\/thead><tbody>\n\t<tr class=' flex flex-col mt-xs lg:border-t border-dashed first:border-none lg:border-white lg:table-row tableToNormal     odd:bg-green-lighter even:bg-green-lightest py-xs '>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Bachelor's thesis, you will work on the following tasks ' >Familiarization with the new injection moulding and testing process <\/td>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Master's thesis, you will work on the following tasks' >Familiarization with the new injection moulding and testing process<\/td>\n\t<\/tr>\n\t<tr class=' flex flex-col mt-xs lg:border-t border-dashed first:border-none lg:border-white lg:table-row tableToNormal     odd:bg-green-lighter even:bg-green-lightest py-xs '>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Bachelor's thesis, you will work on the following tasks ' >Production of tubular test specimens using the injection molding process <\/td>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Master's thesis, you will work on the following tasks' >Production of tubular test specimens while ensuring the high orientation of the fibers on the process side<\/td>\n\t<\/tr>\n\t<tr class=' flex flex-col mt-xs lg:border-t border-dashed first:border-none lg:border-white lg:table-row tableToNormal     odd:bg-green-lighter even:bg-green-lightest py-xs '>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Bachelor's thesis, you will work on the following tasks ' >Uniaxial testing of pipe specimens in the tension-compression-torsion test <\/td>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Master's thesis, you will work on the following tasks' >Uniaxial testing of pipe specimens in the tension-compression-torsion test<\/td>\n\t<\/tr>\n\t<tr class=' flex flex-col mt-xs lg:border-t border-dashed first:border-none lg:border-white lg:table-row tableToNormal     odd:bg-green-lighter even:bg-green-lightest py-xs '>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Bachelor's thesis, you will work on the following tasks ' >Evaluation and interpretation of test data <\/td>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Master's thesis, you will work on the following tasks' >Multiaxial testing with the new test concept and strain measurement in the test area using video extensometry<\/td>\n\t<\/tr>\n\t<tr class=' flex flex-col mt-xs lg:border-t border-dashed first:border-none lg:border-white lg:table-row tableToNormal     odd:bg-green-lighter even:bg-green-lightest py-xs '>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Bachelor's thesis, you will work on the following tasks ' >  <\/td>\n\t\t<td class='grid grid-cols-2 gap-xs lg:table-cell before:block lg:before:hidden first:pl-2xs last:pr-2xs   before:text-right before:font-semibold before:font-serif align-top  py-3xs ' data-col-name='For a Master's thesis, you will work on the following tasks' >Evaluation and interpretation of the test data and identification of the fracture pattern<\/td>\n\t<\/tr>\n\n<\/tbody>\n<\/table>\n\n<\/section>\n\n\n<h3 class=\"wp-block-heading\">Your profile:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Natural science or engineering degree (e.g. general mechanical engineering, industrial engineering, materials science, applied polymer science)<\/li>\n\n\n\n<li>Independent and quality-conscious way of working<\/li>\n\n\n\n<li>Interest in experimental work and scientific data analysis<\/li>\n\n\n\n<li>Ideally initial experience in the field of mechanical testing<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">These are your benefits:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Learn scientific work in a motivated team with intensive supervision<\/li>\n\n\n\n<li>Participate in the co-development of a new testing methodology and support its transfer to near-series testing with high industrial relevance<\/li>\n\n\n\n<li>Build on existing prior experience and expand it in a targeted manner in an experimental environment under intensive supervision<\/li>\n\n\n\n<li>Learn the systematic collection, evaluation and interpretation of experimental measurement data<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Has this vacancy piqued your interest? Then get in touch with me by e-mail or phone and send me your application documents.<br> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Develop a multiaxial failure criterion for short-fiber-reinforced thermoplastics using novel injection molding and testing methods<\/p>\n","protected":false},"featured_media":11912,"parent":0,"template":"","srtk":[807,808],"research_fields":[809,841],"esl":[683],"class_list":["post-11913","cpt_ikv_srt","type-cpt_ikv_srt","status-publish","has-post-thumbnail","hentry","srtk-bachelor-thesis","srtk-master-thesis","research_fields-fiber-reinforced-plastics","research_fields-analysis-and-testing-of-plastics","esl-experimental"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Development of a material-specific multiaxial failure criterion for short-fiber-reinforced thermoplastics | IKV-Aachen<\/title>\n<meta name=\"description\" content=\"Develop a 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