信息来源：暂无发布日期: 2015-03-31浏览次数:

                                  Zhibin Zhu^1,2,a, Xiaoxiang Yang³, Li-jing Chen³,
                                    Naichang Lin^2,3, Zhituo Wang¹, Zhefang Wang^{1
                    1}College of Chemistry and Chemical Engineering, Fuzho University, Fuzhou 350108,China;
                              ²Xiamen Special Equipment Inspection Institute, Xiamen 361004,China；
                ³College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108,China
                                                ^aemail:zhuzb2001@163.com

Keywords: polyethylene pipe; viscoelastic; Prony series; 1/4 node singular element; stress intensity factor
Abstract. Based on the viscoelastic material property of polyethylene pipe, software ANSYS was used to simulate and analyze the mechanical property of polyethylene pipe butt fusion joints with circumferential surface crack defects. The viscoelastic material creep parameters were characterized as Prony series and 1/4 node singular element was selected for meshing along the boundaries of the
crack, then the stress intensity factor of polyethylene pipe butt fusion joints with circumferential surface crack was calculated under the uniform internal pressure. Through the finite element simulation, the result showed that polyethylene pipe were most likely to fracture failure when crack initiated. Thus the viscoelasticity of materials can be ignored when analyzing the stress intensity factor of circumferential surface cracks of polyethylene pipe. the maininfluencing factor of the circumferential crack defects was the ratio of the crack depth to the thickness of polyethylene pipe.