夹芯复合板柱面成形的数值模拟及试验  

Numerical simulation and experiment of cylindrical forming of sandwich composite panel

作　　者：梁晓波 蔡中义[1,2] 高鹏飞 LIANG Xiao- bo;CAI Zhong -yi;GAO Peng -fei(Rolling Forging Institute, Jilin University, Changchun 130022, China;College of Materials Science and Engineering, Jilin University, Changchun 130022, China)

机构地区：[1]吉林大学辊锻工艺研究所,长春130022 [2]吉林大学材料科学与工程学院,长春130022

出　　处：《吉林大学学报（工学版）》2018年第3期828-834,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51575231)

摘　　要：对不同变形程度的双向梯形夹芯复合板进行了柱面弯曲数值模拟和试验研究,分析了夹芯板曲面成形的变形特点、规律及主要成形缺陷。结果表明:在夹芯板柱面弯曲成形过程中,面板和芯板焊接区域的应力和变形明显小于面板及芯板的悬空区,上面板沿弯曲方向焊接区的应变和等效应力只有悬空区的15.2%和76.2%;下面板焊接区的应变和等效应力只有悬空区的11.5%和67%;夹芯的弯曲变形主要通过改变斜面与底面夹角而实现,并且胞元的变形大部分集中在过渡曲面区域;夹芯板弯曲过程中主要的成形缺陷有凹陷、局部直面和折皱3种形式,面板厚度和变形程度是影响成形缺陷的主要因素。最后,利用多点柱面弯曲试验证明了数值模拟预测夹芯板成形特点的正确性。Numerical simulation and experiment were performed to study the bending-forming process of bidirectional trapezoidal sandwich panel with different deformation degrees. The deforming characteristics,regularity and main forming defects of the panel were investigated.The results show that the stress and strain of the weld region between the face sheet and the core plate are obviously less than that of the suspended area.The strain and equivalent stress of the top face sheet in the weld region are respectively 15.2% and 76.2% of that in the suspended region.The strain and equivalent stress in weld region of the bottom face sheet are respectively 11.5% and 67% of that in the suspended region.Each cell of the core is mainly deformed by changing the angle between the inclined plane and the bottom plane.Moreover,the deformation of the core cell is mostly converged in the transition curved region.The depression,straight plane and wrinkle are the main forming defects in the forming process of the sandwich panel.Face sheet thickness and deformation degree are the mainfactors affecting the forming defects.The characteristics of the formed part of the sandwich panel are tested by multi-point bidirectional bending test,and the correctness of numerical simulation of the forming defects is verified.

关 键 词：材料合成与加工工艺 夹芯复合板 数值模拟 柱面成形 成形缺陷 

分 类 号：TG306[金属学及工艺—金属压力加工]