(中南工業(yè)大學(xué)材料科學(xué)與工程系，長(zhǎng)沙 410083)
摘 要: 在Hill的各向塑性異性條件下推導(dǎo)了不銹鋼覆鋁板成形極限的計(jì)算模型。在應(yīng)變比為負(fù)(β<0)的區(qū)域，根據(jù)Hill的局部頸縮理論推導(dǎo)出了復(fù)合板的局部頸縮條件式; 在應(yīng)變比為正(β<0)的區(qū)域，先根據(jù)Swift理論推導(dǎo)出了復(fù)合板的擴(kuò)散頸縮條件式并計(jì)算出 出現(xiàn)擴(kuò)散頸縮的應(yīng)變，然后在此基礎(chǔ)上根據(jù)修正M-K理論推導(dǎo)出了復(fù)合板的局部頸縮的極限應(yīng)變計(jì)算式。計(jì)算結(jié)果與實(shí)驗(yàn)數(shù)據(jù)吻合較好，發(fā)現(xiàn)復(fù)合板的成形極限介于其母材之間，并隨著其母材中成形性好的材料的厚比增大而提高。
關(guān)鍵字: 不銹鋼覆鋁板 成形極限 頸縮
（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
