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在Ｈｉｌ的各向塑性异性条件下推导了不锈钢覆铝板成形极限的计算模型。在应变比为负（β＜０）的区域，根据Ｈｉｌ的局部颈缩理论推导出了复合板的局部颈缩条件式；在应变比为正（β＜０）的区域，先根据Ｓｗｉｆｔ理论推导出了复合板的扩散颈缩条件式并计算出出现扩散颈缩的应变，然后在此基础上根据修正Ｍ－Ｋ理论推导出了复合板的局部颈缩的极限应变计算式。计算结果与实验数据吻合较好，发现复合板的成形极限介于其母材之间，并随着其母材中成形性好的材料的厚比增大而提高。
The calculation model of the forming limit of stainless steel clad aluminum plates was derived under the condition of Hil plastic anisotropy. In the region where the strain ratio is negative (β <0), the local necking condition of the composite plate is deduced according to the local necking theory of Hil. In the region with positive strain ratio (β <0) Based on the modified M-K theory, the formula for calculating the ultimate strain of the local shrinkage of the composite plate is deduced. The calculation results are in good agreement with the experimental data. It is found that the forming limit of the composite plate is between the base metal and increases with the increase of the thickness ratio of the material with good formability in the base metal.