(中南工业大学材料科学与工程系，长沙 410083)
摘 要: 在Hill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Hill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。
关键字: 不锈钢覆铝板 成形极限 颈缩
（Department of Materials Science and Engineering,
Central South University of Technology,Changsha 410083, P. R. China）
Abstract:Based on the theory of Hill's anisotropy plasiticity, the model for computing the forming limit strain of stainless-steel clad aluminum has been inferred. When the strain ratio is negative, the equation of local necking limit strain of clad sheet was inferred according to Hill's local necking theory; when the strain ratio is positive, the equation of the diffusive necking limit strain of clad sheet was inferred firstly according to Swift's diffusive necking theory and the limit strain was worked out. And based on the limit strain, the equation of diffusive necking limit strain of clad sheet was inferred according to the revisionary M-K theory. The calculated result matches well with the measured data. It was found that the pressing forming limit strain of clad sheet is between those of its component materials and the pressing forming limit strain of clad sheet increases with the thickness of its component material which has a high pressing forming limit strain.
Key words: stainless steel clad aluminium pressing forming limit strain necking
