Residual Stress Field Analysis For Aluminum Alloy Cylinder Structure With Rib

The aluminum alloy structure widely applies to the traffic, the railroad, the ships, aerospace and the manufacturing engineering field. In its welding manufacture process, because its thermal-expansion coefficient is big, the elasticity coefficient is small, welding residual stress and bigger welding residual deformation will be inevitably generated. At the same time, regarding aluminum alloy cylinder structure reinforced by rib with discontinuous fillet, the welding residual stress condition is extremely complex after welding. Therefore, the study on the residual stress of the aluminum alloy structure with discontinuous fillet has the important theory significance and the realistic value.Based on the heat-elastic-plastic theory, this thesis carried on the three dimensional numerical analysis to the 5A06 aluminum alloy structure with discontinuous fillet by used of the finite element analysis software ANSYS. We studied in the dynamic welding stress evolution and the distribution rule of aluminum alloy structure with discontinuous welding process thoroughly. This main work and the achievement of this thesis have following several aspects.First, this thesis analyzed the characteristic of aluminum alloy cylinder structure reinforced by rib, took a part structure replace an entirety, considered the material thermo-physical performance and the mechanical property relied on to the temperature change, and built a finite element model. The results demonstrated that this model can fully reflect the characteristic the research object, simulated the whole welding process. A realistic conclusion was achieved from the modeling result.This finite element analysis built a thermal resource model and used a circle program to achieve a moving heat load in welding process. The heat input was successfully resolved, analysis process was consistent with the real welding situation.Finally, on the foundation of above works, the analysis results achieved the temperature field, instantaneous stress field and residual stress field in different moments. The FEA results were consistent with the theory and practice. All above analysis demonstrated that the simulation method of this test was efficient and provided a reference to process technology of aluminum alloy welded structure.