基于裂纹开裂角度的夹层板层间开裂  

Debonding analysis for sandwich plates based on crack opening angle

作　　者：薛启超[1] 邹广平[1] 李佳[2] 梁志国 蒋禹 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001 [2]沈阳发动机设计研究所强度设计室,沈阳110015

出　　处：《复合材料学报》2017年第8期1870-1877,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51409056);黑龙江省自然科学基金(E2015047;E2015045);中央高校基本科研业务费专项基金(HEU20160202)

摘　　要：以聚氨酯弹性体钢夹层板为研究对象,对黏弹性夹芯夹层结构三点弯曲实验卸载后裂纹会沿层间方向继续扩展这一现象进行研究。开展了不同硬度夹芯的双悬臂梁(Double Cantilever Beam,DCB)实验和单悬臂梁(SLB)实验,测得了临界应变能释放率。在假设裂纹张开角度在开裂过程中不变的前提下,推导了临界应变能释放率的计算公式。并计算了软夹芯试件和硬夹芯试件的临界破坏的裂纹长度。结果表明,虽然存有一定的局限性,但是裂纹张开角度能够描述黏弹性夹层结构的层间裂纹扩展,获得的结果能够描述聚氨酯弹性体钢夹层板的层间延迟破坏的特点。Specimens of sandwich plate with viscoelastic core for 3-points bending test appear delay debonding at interface after unloading.Theoretical and experimental approaches for sandwich plate with steel faceplates and polyurethane elastomer core were utilized here to study this phenomenon.Double Cantilever Beam（DCB）and Single Cantilever Beam（SLB）tests were conducted here to obtain strain energy release rate（SERR）between face plates and core.And the expression of critical SERR was deduced on condition of unchanged crack tip opening angle.Furthermore,critical crack length for two types of sandwich plate with different core was calculated.The results show that despite of some limitations,crack tip opening angle can illustrate the propagation of interface crack and reveal the characteristic of delay debonding of sandwich plate with polyurethane core and steel faceplate.

关 键 词：聚氨酯弹性体 夹层复合结构 层间开裂 应变能释放率 黏弹性夹芯 裂纹开裂角度 

分 类 号：TB330.1[一般工业技术—材料科学与工程] U66[交通运输工程—船舶及航道工程]