Validation of a direct method to predict the strength of adhesively bonded joints

Science and Technology of Materials Pub Date : 2018-09-01 DOI:10.1016/j.stmat.2017.12.002

U.T.F. Carvalho, R.D.S.G. Campilho

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引用次数: 3

Abstract

Cohesive zone models (CZM) are a powerful tool for the design of bonded structures, but they require careful estimation of the cohesive laws for reliable results. This work experimentally evaluates by the J-integral/direct method the tensile and shear CZM laws of three adhesives with distinct ductility. Additionally, by the direct method, the precise shape of the cohesive law in tension and shear of the adhesives is defined. The double-cantilever beam (DCB) and end-notched flexure (ENF) specimens were considered to obtain the tensile and shear CZM laws of the adhesives, respectively. After obtaining the tensile and shear CZM laws, triangular, exponential and trapezoidal CZM laws were built to reproduce their behaviour. Validation of these CZM laws was undertaken with a mixed-mode geometry (double-lap joint) considering the same three adhesives and varying overlap lengths (L_O). The strength prediction by this technique revealed accurate predictions for a given CZM law shape, depending on the adhesive ductility, although all CZM law shapes were moderately accurate.

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预测粘接接头强度的直接方法的验证

黏结区模型(CZM)是粘结结构设计的有力工具，但为了得到可靠的结果，需要对黏结规律进行仔细的估计。本文采用j积分/直接法对三种不同延性胶粘剂的拉伸和剪切CZM规律进行了实验评价。此外，用直接法确定了胶粘剂在拉伸和剪切作用下的黏结规律的精确形状。以双悬臂梁(DCB)和端缺口弯曲(ENF)试件为研究对象，分别获得了胶粘剂的拉伸和剪切CZM规律。在得到拉伸和剪切CZM规律后，建立了三角形、指数和梯形CZM规律来再现它们的行为。对这些CZM定律进行了验证，采用混合模式几何形状(双搭接)，考虑相同的三种粘合剂和不同的重叠长度(LO)。该技术的强度预测揭示了对给定的CZM定律形状的准确预测，这取决于粘合剂的延展性，尽管所有的CZM定律形状都是中等准确的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Science and Technology of Materials

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