摘要
采用拉伸-卸载试验对覆铜箔层压板的拉伸变形、断裂及拉伸致卷曲性能进行研究。通过建立数学模型分析了界面剪应力、试样弯曲变形能与卷曲半径的关系。结果表明:覆铜板的拉伸变形主要为塑性变形机制,具有二次断裂特性,铜箔的起裂点位于宽度方向边界,通过多晶组织的滑移分离实现韧性断裂;铜箔与基底(PET薄膜)界面处剪应力的产生引起试样向基底方向发生圆筒状卷曲,卷曲半径随拉伸应变的增加而减小。
Tensile-unload tests were employed to investigate the tensile deformation, fracture, and curvatureof copper clad laminate（CCL）. The results show that the tensile deformation of the CCL mainly isplastic deformation and the CCL cracks twice. The initial crack points of the copper foil locate the edge,and the ductile fracture is caused by sliding and segregation of grain boundary. The cylindrical curvatureof the sample to the PET side is caused by the shear stress at the interface of copper foil and PETfilm, and the curvature radius decrease with the increase of the tensile strain. A mathematical model wasestablished to analyze the relationship among the shear stress, bending deformation energy, and curvatureradius.
出处
《绝缘材料》
CAS
北大核心
2014年第6期103-107,共5页
Insulating Materials
基金
"十二五"航空支撑项目(61901100305)
关键词
覆铜箔层压板
塑性变形
卷曲
剪应力
模型
copper clad laminates
plastic deformation
curvature
shear stress
mathematical model
