基于极限载荷与断裂强度的5A06铝合金焊接缺 陷安全性评定的数值方法研究.pdf

Material Sciences 材料科学, 2017, 7(9), 791-804 Published Online December 2017 in Hans. /journal/ms /10.12677/ms.2017.79103 Numerical Method Study on Safety Assessment of Welding Defects of 5A06 Aluminum Alloy Based on Ultimate Load and Fracture Strength 1 1* 2 2 1 Hongzhou Yan , Xiangguo Zeng , Maobing Shuai , Yubin Li , Huayan Chen 1 College of Architecture and Environment, Sichuan University, Chengdu Sichuan 2 China Academy of Engineering Physics, Mianyang Sichuan rd th th Received: Dec. 3 , 2017; accepted: Dec. 19 , 2017; published: Dec. 29 , 2017 Abstract In this paper, a numerical method for assessment the safety of 5A06 aluminum alloy strip with welded defects is established. First, the quantitative relationship between the limit stress and the length of the crack is established by the limit load analysis method, and then the failure assess- ment curve (FAC) can be obtained. For the 130 mm thick 5A06 Aluminum Alloy butt welding plate, welding residual stress distribution and residual stress intensity factor are obtained by SINTAP, and the stress intensity factor of the working load is calculated by the virtual crack closure tech- nique (VCCT method), then the 5A06 Aluminum Alloy failure assessment diagram (FAD) is estab- lished. The numerical method proposed in this paper can be used to evaluate the safety of the bearing capacity under the condition of a given defect. On the contrary, under the given external load conditions, the limitation of the defect can be determined. Keywords Numerical Simulation, 5A06 Aluminum, Butt-Welded Plate Crack,