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.

在本文中，通过拉伸试验对由缺口制成的ASTM-D638试样和ASTM E1820-01 U形试样进行了拉伸试验，研究了应力三轴性对通过注射成型工艺制造的短纤维增强复合材料的破坏应变的影响。用20％的短碳纤维（PA6-20CF）增强的聚酰胺6热塑性聚合物。从实验和有限元分析的综合研究中，可以将与破坏应变和应力三轴性相关的函数开发为在设计阶段由短纤维增强聚合物制成的复杂组件的破坏准则，在这种情况下，没有直接测试是可行的选择。