Thick adhesive layers have potential structural application in ship construction for the joining of a composite superstructure to a steel hull. The purpose of this study is to develop a mechanics model for the adhesive fracture of such lap joints under shear loading. Modified Thick-Adherend-Shear-Test (TAST) specimens made from a MMA-based adhesive and steel adherents are designed and fabricated. Crack initiation and growth of these joints is measured and monitored by Digital Image Correlation (DIC). An attempt is made to use a cohesive zone model to predict the magnitude of shear strain across the adhesive layer both at crack initiation and at peak load, and to predict the extent of crack growth as a function of shear strain across the adhesive layer. The ability of a cohesive zone model to predict several features of specimen failure is assessed for the case of an adhesive layer of high shear ductility.

厚的粘合剂层在船舶制造中具有潜在的结构应用，可用于将复合物上部结构连接到钢壳。这项研究的目的是建立一种在剪切载荷作用下这种搭接接头胶粘断裂的力学模型。设计和制造了由基于MMA的粘合剂和钢粘合剂制成的改良型厚粘附剪切试验（TAST）标本。这些接头的裂纹萌生和扩展通过数字图像关联（DIC）进行测量和监控。尝试使用内聚区模型来预测在裂纹萌生和峰值载荷下穿过粘合剂层的剪切应变的大小，并预测裂纹扩展的程度作为穿过粘合剂层的剪切应变的函数。