Modified h factor of center cracked panel specimen based on three-dimensional finite element simulation
The structural integrity assessment, which is established based on the fracture mechanics method and the principle of fitness for service, has been widely used in the world. J integral engineering calculation method proposed by EPRI (American Electric Power Research Institute) is quite mature and hence the failure assessment curve has been set up. Due to the limit of calculation condition at that time, EPRI has built a variety of full plastic h factors of various crack configuration according to an array of two-dimensional(2-D)finite element analysis(FEA), which has been widely used in engineering assessment. Currently, three-dimensional (3-D) FEA has been widely applied to reckon J integral. In this paper, elasto-plastic finite element solution for different thickness center cracked panel (CCP) specimen made from titanium alloy TA2 has been calculated with ABAQUS code to obtain the stress field, J integral value and its relationship with the thickness. The research results show that along the thickness direction, stress level of crack front on the intermediate layer is higher than that at other layer and it will first enter the plastic zone, namely, the middle layer is more likely to rupture. In the direction of thickness, J integral value is different for the position on the surface and that on the intermediate layer. When the CCP specimen is thinner, the result is close to plane stress. With the increase of thickness, J integral curve gradually shift, which comes close to plane strain. Finally, full plastic h factor is calculated depending on J integral from CCP three-dimensional finite element model with different thickness and crack length, then modified h factor is acquired and compared with h factor from EPRI
Three-dimensional finite element TA2 CCP specimen J integral h factor
Hui Liu Changyu Zhou Qiao Dai
School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China
国际会议
2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012
济南
英文
101-106
2012-10-31（万方平台首次上网日期，不代表论文的发表时间）