Experimental and numerical study of rate-dependent mode-I failure of a structural adhesive

IF 2.9 4区材料科学 Q2 ENGINEERING, CHEMICAL

Journal of Adhesion Pub Date : 2022-09-07 DOI:10.1080/00218464.2022.2106132

Leo Škec, G. Alfano

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引用次数: 6

Abstract

ABSTRACT We present an experimental and numerical study of the rate dependence of the mode-I failure of adhesive joints, focussing on aluminium plates bonded with Araldite® 2015. For the experimental part, we tested 24 double-cantilever beams (DCB) at six different prescribed speeds, from 0.1 to 5000 mm/min. The numerical simulations use a previously proposed cohesive-zone model (CZM) based on fractional viscoelasticity and a novel finite element combining a Timoshenko beam and an interface element. The CZM had previously been validated for a rubber interface, so here we present a procedure to identify its input parameters and validate its capability to predict the failure of joints made with an epoxy adhesive. An effective procedure is also developed to evaluate the dependence of the fracture energy on the crack speed without experimentally measuring the crack speed. The adhesive response was found to be markedly rate dependent. Within the range of tested speeds, the fracture energy of the adhesive more than doubles its value and the shape of the ‘fracture energy-crack speed’ curve resembles a sigmoidal shape, but more tests are needed at higher speeds to better determine the maximum value of the fracture energy and the actual shape of the complete curve.

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结构胶粘剂速率相关ⅰ型破坏的实验与数值研究

摘要：我们对粘接接头I型失效的速率依赖性进行了实验和数值研究，重点是用Araldite®2015粘接的铝板。对于实验部分，我们在0.1至5000 mm/min的六种不同规定速度下测试了24个双悬臂梁（DCB）。数值模拟使用了先前提出的基于分数粘弹性的粘性区模型（CZM）和结合Timoshenko梁和界面单元的新型有限元。CZM之前已经针对橡胶界面进行了验证，因此在这里我们提出了一个程序来识别其输入参数，并验证其预测环氧粘合剂接头失效的能力。还开发了一种有效的程序来评估断裂能对裂纹速度的依赖性，而无需通过实验测量裂纹速度。发现粘附反应明显依赖于速率。在测试速度范围内，粘合剂的断裂能是其值的两倍多，“断裂能-断裂速度”曲线的形状类似于S形，但需要在更高的速度下进行更多的测试，以更好地确定断裂能的最大值和完整曲线的实际形状。

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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来源期刊

Journal of Adhesion 工程技术-材料科学：综合

CiteScore

5.30

自引率

9.10%

发文量

审稿时长

1 months

期刊介绍： The Journal of Adhesion is dedicated to perpetuating understanding of the phenomenon of adhesion and its practical applications. The art of adhesion is maturing into a science that requires a broad, coordinated interdisciplinary effort to help illuminate its complex nature and numerous manifestations.