Residual Stress Field Analysis For Aluminum Alloy Cylinder Structure Reinforced By Rib With Discontinuous Fillet

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, will inevitably generate welding residual stress and bigger welding residual deformation. At the same time, regarding aluminum alloy cylinder structure reinforced by rib with discontinuous fillet, the welding residual stress condition is extremely complex after welds. Therefore, study on the residual stress of the aluminum alloy structure with discontinuous fillet has the important theory significance and the realistic value.Based on heat- elastic-plastic theory, this article carried on the three dimensional numerical analysis to the 5A06 aluminum alloy structure with discontinuous fillet used 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 article have following several aspects.First of all, take a representative part of overall structure, this article established the temperature field and the stress strain field of aluminum alloy structure with discontinuous fillet in three dimensional finite element analysis models, and considered the material thermo physical performance and the mechanical property relied on to the temperature changes. This can be as an effective reference for processing technique of aluminum alloy structure.Furthermore, in view of the structure in real product, we get rid of two parts of aluminum blocks, which lies in the bottom and top of the computation model. And we analyses the residual stress distribution after getting rid of blocks. Finally results indicate that the aluminum alloy near the block re- distributes residual stress. The weld residual stress of other parts did not have big change.Finally, we expanded the computation model on axial expands three times for final analysis. Then we simulated the residual stress field distribution of the structure welds after expansion. The result indicates that the structure residual stress distribution is similar to the original computation models. It does not have the obvious change. It also indicates that simulation strategy of part of the structure is available.