针对铝合金-聚合物复合层板弯曲回弹问题,分析了复合层板弯曲过程表面层铝板及中心层聚合物的变形特征,建立了复合层板平面应变纯弯曲回弹理论分析模型.采用建立的模型预测了复合层板纯弯曲过程回弹角变化,并与实验结果进行了对比,分析了聚合物层厚度及铝合金板材力学性能对回弹的影响规律.结果表明：随着中心聚合物层厚度的增加,复合层板回弹角降低;随着表面层铝板强度的降低,复合层板回弹角减小.理论预测结果与实验结果一致,说明了本文推导的理论模型的可靠性.
This paper focus on studying the springback of aluminum alloy-polymer sandwich sheets in bending process.An analytical model for predicting the springback of sandwich sheets was proposed on the basis of analyzing the deformation behavior of skin sheet and core materials in bending process.Then the proposed model was used to predict the springback angle of aluminum alloy-polyethylene sandwich sheets after pure bending process.The predicted results were compared with experimental ones and the influences of the thickness of polymer and mechanical properties of aluminum alloy sheet on the springback angle were investigated.The springback angle of aluminum alloy-polymer sandwich sheet decreases with the increasing of polymer thickness and decreasing of the strength of the aluminum alloy sheet.Good agreements between predicted results and experimental ones prove the validity of the proposed model.
参考文献
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