论文标题
经过准静态接触载荷的花岗岩的损坏模型
A damage model for granite subjected to quasi-static contact loading
论文作者
论文摘要
采用各向异性损伤模型，以模拟准静态球形凹痕载荷下的Bohus花岗岩的断裂模式。所选的损伤描述被添加到具有可变扩张角的先前使用的Drucker-prager可塑性模型中。实施了所得的本构模型，以模拟在凹痕下直至材料的负载能力下的Bohus花岗岩的行为。最初的碎片对应于力 - 渗透曲线中的第一个小负载 - 可能是由于高径向拉伸应力状态在接触边界处或接近接触边界所致。将数值模拟的预测断裂模式和力 - 渗透均与实验数据进行了比较，并发现了良好的一致性。材料的拉伸强度的变异性通过利用Weibull统计数据包括在选定的损伤模型中。在这项工作中，建议您可以自己使用凹痕测试结果来校准小尺寸尺度上的拉伸强度的统计分布，例如在压痕应用中。
An anisotropic damage model is employed in order to simulate the fracture pattern of Bohus granite under quasi-static spherical indentation loading. The chosen damage description is added to the previously employed Drucker-Prager plasticity model with variable dilation angle. The resulting constitutive model is implemented to simulate the behavior of Bohus granite under indentation up to the load capacity of the material. The initial fragmentation, corresponding to the first small load-drop in the force-penetration curve, is likely due to the high radial tensile stress state at or close to the contact boundary. Both predicted fracture pattern and force-penetration results from the numerical simulation are compared to experimental data and a good agreement is found. The variability in tensile strength of the material is included in the chosen damage model by taking advantage of Weibull statistics. In this work, it is suggested that indentation test results by themselves may be used to calibrate the statistical distribution of tensile strength at small size scales such as in indentation applications.
