基于FEM的承受附加载荷的法兰连接安全评价

在考虑垫片力学性能的非线性和非保守的基础上,提出了承受附加载荷高温螺栓法兰连接结构的有限元分析方法。运用APDL和UIDL,开发了基于ANSYS环境的法兰连接结构强度和紧密性分析模块,实现了连接系统的参数化建模及程序化计算。提出了基于紧密性的承受附加载荷螺栓法兰连接的安全评价方法,并以某铂重整装置接管法兰连接为对象,验证了有限元分析和安全评价方法的可行性,确定了该连接的安全操作条件。     

A generalized self-consistent model for interfacial debonding behavior of fiber reinforced rubber matrix sealing composites

This paper presents an experimental and numerical study of short-fiber-reinforced rubber matrix sealing composites(SFRC). The transverse tensile stress-strain curves of SFRC are obtained by experiments. Based on the generalized self-consistent method, a representative volume element(RVE) model is established, and the cohesive zone model is employed to investigate the interfacial failure behavior. The effect of interphase properties on the interfacial debonding behavior of SFRC is numerically investigated. The results indicate that an interphase thickness of 0.3 μm and an interphase elastic modulus of about 502 MPa are optimal to restrain the initiation of the interfacial debonding. The interfacial debonding of SFRC mainly occurs between the matrix/interphase interface,which agrees well with results by scanning electron microscope(SEM).