环境对超弹性粘接接头扩散和力学性能影响的有限元模拟与实验表征

P. Fernandes, A. Wulf, C. Nagel, V. C. Beber
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引用次数: 0

摘要

在实际应用中,超弹性粘接接头暴露在影响其机械性能的环境条件(湿度和温度)下。了解环境如何通过静荷载和循环荷载影响节点耐久性是确保安全和避免过大尺寸的关键方面。目前的工作是研究环境条件对两种不同的超弹性粘接接头(聚氨酯和硅改性聚合物)的扩散和力学性能的影响。为了评估水分质量扩散过程,在室外风化条件下,对纯胶粘剂样品进行了387天的加权。通过(i)预测40°C/15% r.h(40/15)和40°C/60% r.h(40/60)稳定条件下的饱和浓度,以及(ii)预测室外风化引起的质量变化,验证了有限元扩散过程方法。通过准静态和疲劳拉伸剪切试验,考察了40°C/60% r.h.条件对胶粘剂力学性能影响的可逆性。结果表明,在40°C/60% r.h.的替代气候条件下,不会造成不可逆的损伤,因为40/60条件下的剪切模量、抗拉剪切强度和疲劳寿命的任何潜在下降都可以通过40/15的再干燥来逆转。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FE-Simulation and Experimental Characterisation of Environmental Effects on the Diffusion and Mechanical Performance of Hyperelastic Adhesive Joints
In operational applications, hyperelastic adhesive joints are exposed to environmental conditions (moisture and temperature) that affect their mechanical performance. The understanding of how the environment can influence the joint durability through both static and cyclic loading is a key aspect to ensure safety and avoid over-dimensioning. The current work presents an investigation of the effect of environment conditions on the diffusion and mechanical performance of two different hyperelastic adhesive joints (a polyurethane and a silicon-modified polymer). To assess the process of moisture mass diffusion, pure adhesive samples were weighted for 387 days when subjected to outdoor weathering conditions. An FEA-diffusion procedure method was demonstrated by (i) predicting the saturation concentration at steady conditions of 40 °C/15% r.h. (40/15) and 40 °C/60% r.h. (40/60), and (ii) predicting the experienced mass change due to outdoor weathering. The reversibility of the effect of conditioning at 40 °C/60% r.h. on the mechanical properties of the adhesives was assessed via quasi-static and fatigue tensile shear testing. The results support the conclusion that conditioning with the surrogate climate of 40 °C/60% r.h. does not cause irreversible damage, as any potential decrease in shear modulus, tensile shear strength and fatigue life due to 40/60 conditioning can be reversed by re-drying at 40/15.
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