Aiming at the uniaxial tensile tests for 304 stainless steel sheet with the variables of the thickness,it obtains the true stress strain curve.The experiment result shows that with the decrease of the thickness of the style,the flow stress of thin plate increases,its size shows "the thinner the strong" effect.Comparing the influence of surface grain on the stress and strain with the test data,it analyzes the surface layer thickness and grain size effect to the stress strain curve,and establishes the dimension parameters of surface layer model for performance in the process of sheet metal,proposes the reasonable interpretation of size effect.%针对304不锈钢薄板进行了不同板厚的单向拉伸试验,得到不同的真实应力-应变曲线,试验结果表明:随着厚度的减小,薄板的流动应力呈现出增大趋势,表现出明显的尺寸效应现象.随后通过建立含有过渡层的表面层模型,对薄板拉伸过程中表现出的尺寸效应进行了合理的解释,并通过试验验证了模型计算结果与试验结果的吻合程度.
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