Reproducing Kernel Particle Method for Non-Linear Fracture Analysis

To study the non-linear fracture, a non-linear constitutive model for piezoelectric ceramics was proposed, in which the polarization switching and saturation were taken into account. Based on the model, the non-linear fracture analysis was implemented using reproducing kernel particle method （RKPM）. Using local J-integral as a fracture criterion, a relation curve of fracture loads against electric fields was obtained. Qualitatively, the curve is in agreement with the experimental observations reported in literature. The reproducing equation, the shape function of RKPM, and the transformation method to impose essential boundary conditions for meshless methods were also introduced. The computation was implemented using object-oriented programming method.     

杂交/混合有限元分析及其微机实施

本文介绍作者利用VICTOR-9000微机进行杂交/混合有限元弹性、塑性—粘塑性分析工作的一些情况。文内包括二维弹性平面应力集中问题,大开孔平板单向受拉时的塑性扩展问题和厚壁圆筒在均匀内压作用下弹塑性变形等三个算例。文内还附有两个程序(可用于弹性、塑性—粘塑性单变量位移协调元及多变量杂交/混合有限元分析)的说明和框图。     

浅埋偏压隧道施工技术

通过对某铁路纵目沟隧道西安端浅埋偏压段的处理,介绍了地面注浆加固、超前管棚及锁脚钢管的施工工艺,分析各影响因素与拱顶沉降与地表下沉的关系,优化了施工方案。