The identification of the mechanical behavior of adhesives is necessary to describe the development of residual stresses during their curing, which might impact their mechanical strength and lead to early failure of the bonding. A simple characterization and modeling approach is therefore developed and presented, which permits to monitor and identify the mechanical behavior of a thermosetting adhesive during the whole curing process. The test method is based on a compressive test, which consists in applying a periodic displacement and recording the subsequent load variations during cure. The test set-up relies on a simple apparatus as it consists in steel cylinders mounted on a standard tensile test machine. The analysis of the mechanical behavior is based on an analytical description of a visco-elastic constitutive law following the Maxwell model, leading to the identification of the material apparent viscosity and Young’s modulus. This characterization methodology is applied to an epoxy adhesive during cure. The obtained mechanical properties are in good agreement with values provided by the material supplier, which permits to validate the developed methodology.

中文翻译：

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用于鉴定固化期间热固性粘合剂粘弹性行为的简单表征方法

粘合剂的机械行为的鉴定对于描述其固化过程中残余应力的发展是必要的，这可能会影响其机械强度并导致粘结的早期失效。因此，开发并提出了一种简单的表征和建模方法，该方法允许在整个固化过程中监视和识别热固性粘合剂的机械性能。该测试方法基于压缩测试，该测试包括施加周期性位移并记录固化期间的后续载荷变化。测试装置依靠一个简单的设备，因为它由安装在标准拉伸试验机上的钢瓶组成。力学行为的分析基于对遵循Maxwell模型的粘弹性本构定律的分析描述，从而确定了材料的表观粘度和杨氏模量。此表征方法可在固化过程中应用于环氧粘合剂。所获得的机械性能与材料供应商提供的值高度吻合，从而可以验证所开发的方法。