A novel material testing concept is developed in order to provide tensile and compressive properties within a single mechanical test. A new specimen geometry is designed for testing in a universal testing machine. Under tensile load, both a homogeneous tensile stress condition as well as a homogeneous compressive stress condition occur in the specimen. Measurements accompanying the experimental test with digital image correlation provide tensile and compressive Poisson’s ratio as well as tensile modulus. These properties are input parameters for subsequent finite element simulations. The compressive modulus is determined by iteratively adjusting finite element simulations in order to couple experimental and simulated results. For validating the concept, experimental tests are carried out on polyoxymethylene. While the tensile Poisson’s ratio of the new concept shows the best agreement with the reference value, the compressive modulus is approximately 15% higher. Further work should focus on an appropriate material model in order to reduce the deviation.

开发了一种新颖的材料测试概念，以便在单次机械测试中提供拉伸和压缩性能。设计了一种新的试样几何形状，用于在万能试验机中进行测试。在拉伸载荷下，样品中同时出现均匀的拉伸应力条件和均匀的压缩应力条件。伴随数字图像相关实验测试的测量提供了拉伸和压缩泊松比以及拉伸模量。这些属性是后续有限元模拟的输入参数。压缩模量是通过迭代调整有限元模拟来确定的，以便将实验结果与模拟结果结合起来。为了验证这一概念，对聚甲醛进行了实验测试。虽然新概念的拉伸泊松比与参考值最一致，但压缩模量高出约 15%。进一步的工作应集中在适当的材料模型上，以减少偏差。