In this work, the crack growth of carbon black-filled ethylene propylene diene monomer rubber was analysed by experimental investigations and numerical simulations. The investigated sample is loaded cyclically under displacement-controlled test condition. The sample had a defined initial crack length. Due to the cyclic loading, the crack grows further due to excess critical energy flux. A uniform pattern was drawn on the surface of the investigated specimen, therefore the crack propagation per cycle can be determined. The cyclic loads were recorded with a camera. The time of initiation of crack propagation was determined by analysing the recorded pictures and the energy flux was determined based on global evaluation of the dissipation potential and the local evaluation of J-Integral.

At the virgin cycle, the energy flux has the largest value, which decreases with increasing number of cycles. This behaviour is due to the stress-softening effect of elastomers. The local energy flux was determined near the crack tip by using the J-Integral. The experimentally and numerically determined energy fluxes show similar decreasing tendencies and have different values. These differences are due to the fact that in the evaluation of the energy flux based on the global energy balance during crack growth, the separation potential and the dissipated potential in the whole sample cannot be separated from each other.

在这项工作中，通过实验研究和数值模拟分析了炭黑填充的三元乙丙橡胶的裂纹扩展。研究的样品在位移控制的测试条件下循环加载。样品具有定义的初始裂纹长度。由于循环加载，裂纹会由于过量的临界能量通量而进一步增长。在研究样品的表面绘制了均匀的图案，因此可以确定每个循环的裂纹扩展。循环载荷用照相机记录。通过分析记录的图片确定裂纹扩展的开始时间，并根据耗散势的全局评估和 J-Integral 的局部评估确定能量通量。

在原始循环中，能量通量具有最大值，随着循环次数的增加而减小。这种行为是由于弹性体的应力软化效应。通过使用 J 积分确定裂纹尖端附近的局部能量通量。实验和数值确定的能量通量显示出类似的下降趋势并具有不同的值。这些差异是由于在基于裂纹扩展过程中全局能量平衡的能量通量评估中，整个样品中的分离电位和耗散电位无法相互分离。