This paper presents a robust methodology aimed at assessing the fracture toughness of materials undergoing quasi-static or dynamic loads leading to crack propagation. The proposed implementation relies on the J-Integral concept and it identically operates with data fields obtained by Finite Element modeling or fields experimentally obtained by Digital Image Correlation technique. The capability of the methodology to extract information is put into practice by simulating a FEM-based Single-Edge Notched test specimen undergoing different loading scenarios, from a simple quasi-static linear load increase up to a very aggressive loading pulse that leads to crack propagation and total failure. To do that, the simulated specimen is modeled by an isotropic damageable and pressure-dependent material model that represents a sample made of epoxy resin. The configuration parameters of the J-integral calculation algorithms and the simulation tests are subjected to an extensive parameter study to evaluate the reliability of the calculated static and dynamic energy release rate, with and without crack propagation. From this analysis, a detailed correlation between the instantaneous evolution of the fracture energy and the stress field at every material point is presented and discussed. The proposed method makes it possible to readily track the sequence of propagation and arrest of dynamic cracks.

本文提出了一种鲁棒的方法，旨在评估承受准静态或动态载荷导致裂纹扩展的材料的断裂韧性。所提出的实现依赖于J-Integral概念，并且与通过有限元建模获得的数据字段或通过数字图像相关技术实验获得的字段完全相同。通过模拟承受不同载荷情况的基于FEM的单边缺口试样，将方法提取信息的能力付诸实践，从简单的准静态线性载荷增加到非常剧烈的载荷脉冲（导致裂纹扩展）和完全失败。为此，要通过模拟各向同性的可破坏且压力相关的材料模型对模拟样品进行建模，该材料模型代表环氧树脂制成的样品。对J积分计算算法的配置参数和模拟测试进行了广泛的参数研究，以评估在有无裂纹扩展的情况下所计算的静态和动态能量释放率的可靠性。通过该分析，提出并讨论了断裂能的瞬时演变与每个材料点处的应力场之间的详细关系。所提出的方法使得可以容易地跟踪动态裂纹的扩展和停止的顺序。给出并讨论了在每个材料点处的断裂能的瞬时演变与应力场之间的详细关系。所提出的方法使得可以容易地跟踪动态裂纹的扩展和停止的顺序。给出并讨论了在每个材料点处的断裂能的瞬时演变与应力场之间的详细关系。所提出的方法使得可以容易地跟踪动态裂纹的扩展和停止的顺序。