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On the rate dependent behaviour of epoxy adhesive joints: Experimental characterisation and modelling of mode I failure

机译：关于环氧胶接接头的速率依赖性行为：I型破坏的实验表征和建模

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摘要

The increasing use of adhesive joints in dynamic applications require reliable measurements of the rate-dependent stress-displacement behaviour. The direct measurement of the stress-displacement curve is necessary when using cohesive models in discretised solutions of boundary value problems in solid mechanics. This paper aims to investigate the rate-dependent tensile failure of adhesive joints by using a new experimental methodology - it relies upon the combination of the stress wave propagation theory and digital image correlation methods on high speed footage to quantify the tensile stress and the dissipated energy respectively. For this purpose, the Split Hopkinson Bar methodology was employed - the experimental configuration was optimised using numerical modelling. To prove the sensitivity of our framework, two different adhesives are characterised at different loading rates: the adhesive failure strength was found to increase considerably with the strain rate, while the plastic deformation of these adhesives was reduced. The film adhesive showed superior performance over the particle toughened one. In the final part, a rate-dependent cohesive zone model is proposed, one which captures the measured behaviour and which has the potential to be used in industrial applications.
机译：在动态应用中越来越多地使用粘合剂接头，需要对速率相关的应力-位移行为进行可靠的测量。当在固体力学的边值问题的离散解中使用内聚模型时，必须直接测量应力-位移曲线。本文旨在通过一种新的实验方法研究胶粘剂接头的速率相关的拉伸破坏-它依赖于高速镜头上的应力波传播理论和数字图像相关方法的结合来量化拉伸应力和耗散能量分别。为此，采用了斯普利特霍普金森棒法-使用数值建模对实验配置进行了优化。为了证明我们框架的敏感性，在不同的加载速率下表征了两种不同的粘合剂：发现粘合破坏强度随应变速率而显着增加，而这些粘合剂的塑性变形却有所降低。薄膜胶粘剂表现出优于颗粒增韧剂的性能。在最后一部分中，提出了一种与速率相关的内聚区模型，该模型可以捕获所测量的行为，并且有可能在工业应用中使用。

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