High Strength Aluminum Alloy Slab Sampling Study The Evolution Of Residual Stress Field Of The Cutting Process

High strength and high toughness aluminum alloy material is widely used in aerospace structural components and weapons manufacturing. Heat treatment methods, such as solid solution and quenching, have greatly enhanced its mechanical strength, which also leave a large internal residual stress in it. The presence of residual stress, making serious deformation of parts during processing or even crack, greatly affects the processing efficiency. Therefore, growing attention has been paid to the study of the emergence and evolution of quenching residual stress in aluminum alloy. At present,the internal residual stress testing methods are mostly destructive testing. In the process of obtaining sample,its residual stress state has changed.So whether it can represent the original stress field in the aluminum alloy plate need to be studied.Starting from this point of view, simulation and experimental study were done as follows:First, based on elasticity theory and finite element method, the finite element models of cutting processing of thick aluminum alloy plate of different thickness were constructed. The results were analyzed contrastively, several rules were obtained. The distance to the incision, in which the stresses change tempestuously, called "characteristic distance" is related to the thickness of the plate.Second, the surface stresses before and after EDM wire cutting were tested by X-ray diffraction method, which was used to verify the results of the simulation. Further studies have shown that the ability to maintain its original stress of the plate increased with the increment of its thickness and there was not a simple linear relationship between the "characteristic distance" and the thickness of the plate.Third, the stresses of samples of different sizes were tested in the method of, to do research on the influence caused by the sample size on the accuracy and stability of the ILRM.All the research context mentioned above will have important referential value for the study on the evolution of the stress fields of the thick aluminum alloy plate during machining processing, will have some guiding significance to sampling for ILRM and also will have a certain theoretical and practical significance on controlling the deformation during the component processing.