|A peridynamic study on quasi-static deformation and failure
|中文关键词: 准静态 变形 破坏 数值模拟 近场动力学
|英文关键词:quasi-static deformation failure numerical simulation peridynamics
| An improved bond-based material model for the elastic deformation and quasi-static fracture analysis of materials and structures has been proposed within the framework of the peridynamic (PD) theory.This model enables accurately analyzing quasi-static elastic behavior of materials and structures under external loads by implementing a local damping into the peridynamic equations of motion and employing a quasi-static step loading method.The effects of the magnitude of the local damping on the accuracy and efficiency of elastic calculation has also been investigated.Meanwhile,the complex failure phenomena such as spontaneous crack propagation can be predicted as a capability inherited from the peridynamic theory.Thus the whole mechanical response of materials and structures,from elastic deformation to crack initiation and propagation until ultimate breaking,can be analyzed with the identical model.In the proposed model,another important feature lies in the micromodulus of the pair-wise bond,which is described as a continuous function of the distance between two particles within the material horizon,and which is demonstrated to be more accurate compared to the previous PD models using a fixed stiffness constant to describe the interaction of particles.The qualitative and quantitative validities of the model have been established through numerical examples.
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