Uniaxial tension tests were performed on the Kevlar-filled EPDM rubber sheet. The short Kevlar fibers are found to align approximately in a single direction. Tensile specimens are thus cut along two different directions, one along the fiber alignment direction (designated as the H specimens) and the other perpendicular to the general fiber direction (the V specimens). The non-contact, optical technique of digital image correlation (DIC) is used to map out the displacement field over the sample surface and the stretches in the loading and the lateral directions are determined from the local displacement measurement. We find that the mechanical response of the Kevlar-filled EPDM rubber sheet along the Kevlar fiber direction is markedly different from that perpendicular to the fiber direction. The Kevlar-filled EPDM rubber sheet has a much higher tensile strength in the Kevlar fiber direction but with less ductility, while the tensile strength is lower in the direction perpendicular to the Kevlar fiber but the ductility is much larger. Failure mechanisms are proposed based on the observation of features of the teared surfaces, and the mechanical parameters that may be related to the mechanical failure are speculated on as well. A non-uniform deformation field develops within the gage section of the specimen and the pattern of the non-uniform deformation is found to correlate with the Kevlar fiber orientation and distribution. In addition, tensile specimens subject to cyclic loadings are tested in the two fiber orientations and the so-called Mullins effect is observed and recorded.

对 Kevlar 填充的 EPDM 橡胶板进行单轴拉伸试验。发现短的 Kevlar 纤维大致在一个方向上排列。因此，拉伸试样沿两个不同的方向切割，一个沿纤维排列方向（指定为 H 试样），另一个垂直于一般纤维方向（V 试样）。数字图像相关 (DIC) 的非接触式光学技术用于绘制样品表面上的位移场，加载和横向方向的拉伸由局部位移测量确定。我们发现 Kevlar 填充的 EPDM 橡胶板沿 Kevlar 纤维方向的机械响应与垂直于纤维方向的机械响应明显不同。芳纶填充EPDM橡胶板在芳纶纤维方向的抗拉强度高得多，但延展性较差，而在与芳纶纤维垂直的方向抗拉强度较低，但延展性大得多。基于对撕裂面特征的观察提出了失效机制，并推测了可能与机械失效相关的力学参数。非均匀变形场在试样的应变片截面内形成，并且发现非均匀变形的模式与 Kevlar 纤维取向和分布相关。此外，在两种纤维取向下测试承受循环载荷的拉伸试样，并观察和记录所谓的穆林斯效应。