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首页> 外文期刊>International Journal of Mechanical Sciences >An improved ordinary state-based peridynamic model for cohesive crack growth in quasi-brittle materials
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An improved ordinary state-based peridynamic model for cohesive crack growth in quasi-brittle materials

机译：用于准脆性材料的粘性裂纹裂纹增长改进的普通状态性逆向模型

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摘要

Ordinary state-based peridynamics (OSBPD) is a well-established peridynamic (PD) model, but its applications are restricted in brittle fracture because the failure models proposed in OSBPD are mainly to describe brittle fracture rather than quasi-brittle fracture. This work attempts to propose a damage model to overcome this limitation for the investigation of damage and crack propagation in quasi-brittle materials. To this aim, a PD version of the cohesive zone model (CZM) is established in OSBPD for the fracture analysis of quasi-brittle materials. A degradation curve is proposed in the damage model to represent the cohesive effect in fracture process zone (FPZ), which is similar to the tension softening curve in CZM. The damage model can be uniquely determined once the tensile strength, the elastic modulus, the specific fracture energy, and tension softening constitutive law are given. Moreover, several representative examples of mode-I and mixed mode concrete fractures are simulated using OSBPD to validate the proposed damage model. The predicted load-displacement curves and crack paths in all the cases are in good agreement with the experimental results or other numerical results. In addition, a reloading approach is proposed to obtain the descending part of load-displacement curve when the load-controlled loading procedure is adopted.
机译：普通状态性表现（OSBPD）是一款良好的白动力学（PD）模型，但其应用受到脆性断裂的限制，因为OSBPD中提出的故障模型主要是描述脆性骨折而不是准脆性骨折。这项工作试图提出损害模型来克服对准脆性材料中损伤和裂纹繁殖的调查的限制。为此目的，在OSBPD中建立了一种凝聚区模型（CZM）的PD版本，用于准脆性材料的断裂分析。在损伤模型中提出了降解曲线，以表示裂缝过程区（FPZ）中的内聚效果，其类似于CZM中的张力软化曲线。一旦给出了抗拉强度，弹性模量，特定断裂能和张力软化方向性术术术后，可以唯一地确定损坏模型。此外，使用OSBPD模拟模式-I和混合模式混凝土骨折的几个代表性实例，以验证所提出的损坏模型。在所有情况下预测的负载 - 位移曲线和裂纹路径与实验结果或其他数值结果非常吻合。另外，当采用负载控制的加载过程时，提出了一种重新加载方法以获得负载 - 位移曲线的下降部分。

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