Indentation tests are widely used to characterize the material properties of heterogeneous materials. So far there is no explicit analysis of the spatially distributed material properties for short fiber-reinforced composites on the mesoscale as well as a determination of the effective cross-section that is characterized by the obtained measurement results. Hence, the primary objective of this study is the characterization of short fiber-reinforced composites on the mesoscale. Furthermore, it is of interest to determine the corresponding area for which the obtained material parameters are valid. For the experimental investigation of local material properties of short fiber-reinforced composites, the Young’s modulus is obtained by indentation tests. The measured values of the Young’s modulus are compared to results gained by numerical simulation. The numerical model represents an actual microstructure derived from a micrograph of the used material. The analysis of the short fiber-reinforced material by indentation tests reveals the layered structure of the specimen induced by the injection molding process and the oriented material properties of the reinforced material are observed. In addition, the experimentally obtained values for Young’s modulus meet the results of a corresponding numerical analysis. Finally, it is shown, that the area characterized by the indentation test is 25 times larger than the actual projected area of the indentation tip. This leads to the conclusion that indentation tests are an appropriate tool to characterize short fiber-reinforced material on the mesoscale.

压痕测试广泛用于表征异质材料的材料特性。到目前为止，还没有在中尺度上对短纤维增强复合材料的空间分布材料特性进行明确分析，也没有确定由获得的测量结果表征的有效截面。因此，本研究的主要目标是在中尺度上表征短纤维增强复合材料。此外，确定获得的材料参数有效的相应区域也很有趣。对于短纤维增强复合材料局部材料特性的实验研究，杨氏模量是通过压痕测试获得的。杨氏模量的测量值与通过数值模拟获得的结果进行比较。数值模型表示从所用材料的显微照片得出的实际微观结构。通过压痕试验对短纤维增强材料的分析揭示了由注射成型过程引起的试样的层状结构，并观察了增强材料的取向材料特性。此外，杨氏模量的实验获得值符合相应数值分析的结果。最后，它表明，压痕测试表征的面积比压痕尖端的实际投影面积大 25 倍。由此得出的结论是，压痕测试是在中尺度上表征短纤维增强材料的合适工具。通过压痕试验对短纤维增强材料的分析揭示了由注射成型过程引起的试样的层状结构，并观察了增强材料的取向材料特性。此外，杨氏模量的实验获得值符合相应数值分析的结果。最后，它表明，压痕测试表征的面积比压痕尖端的实际投影面积大 25 倍。由此得出的结论是，压痕测试是在中尺度上表征短纤维增强材料的合适工具。通过压痕试验对短纤维增强材料的分析揭示了由注射成型过程引起的试样的层状结构，并观察了增强材料的取向材料特性。此外，杨氏模量的实验获得值符合相应数值分析的结果。最后，它表明，压痕测试表征的面积比压痕尖端的实际投影面积大 25 倍。由此得出的结论是，压痕测试是在中尺度上表征短纤维增强材料的合适工具。