4.7 Article

Influences of stress triaxiality and local fiber orientation on the failure strain for injection-molded carbon fiber reinforced polyamide-6

Journal

ENGINEERING FRACTURE MECHANICS
Volume 250, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.107784

Keywords

Thermoplastic polymer; Polyamide-6; Stress Triaxiality; Failure strain; Failure criterion

Categories

Funding

  1. Material Component Technology Development Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20004983]
  2. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2019R1I1A1A01062323]
  3. Korea Evaluation Institute of Industrial Technology (KEIT) [20004983] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  4. National Research Foundation of Korea [2019R1I1A1A01062323] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this study, a function correlating failure strain and stress triaxiality was developed through combined experimental and finite element analysis, providing a viable failure criterion for complex components made of short fiber-reinforced polymers during the design stage where direct testing is not possible.
In this paper, the influence of the stress triaxiality on the failure strain of short fiber-reinforced composite, manufactured by the injection molding process, is investigated by tensile tests on notched ASTM-D638 specimen and ASTM E1820-01 U-Shape specimens made of a polyamide-6 thermoplastic polymer reinforced with 20% of short carbon fibers (PA6-20CF). From the combined experimental and FEA investigations, a function correlating the failure strain and the stress triaxiality has been developed can be utilized as a failure criterion for complex components made of short fibers reinforced polymers during the design stage, where no direct testing is a viable option.

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