Mechanical Characteristics of Degraded Silicone Bonded Point Supports

A. Hagl, A. Wolf, S. Dean
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Abstract

Tensile loading of bonded point supports is considered as the critical load case for adhesive material, e.g., silicone applied to such kinds of fixtures. From a durability point of view, the following defects of two-component adhesives are expected to have a significant impact on the response to this loading regime: the wrong mixing ratios of the adhesive components, inhomogeneous mixing due to insufficient or poor mechanical mixing procedures, load degradation of the adhesive bonding material, local degradations of the bonding, e.g., bubbles or poor adhesion. In order to investigate these aspects, different experimental approaches have been pursued. Regarding the mixing ratio aspect, material tests were performed with systematically varied mixing ratios for the analysis of the elastic and strength properties while for the other topics, tensile tests of bonded point supports were evaluated in detail. Cyclic tests of point supports in the tensile load regime were set up, differing in amplitudes and maximum peaks of the cycles, in order to analyze the impact of load histories on the mechanical characteristics of the specimens. For point supports subjected to monotonically increasing loads the qualitative assessment of the fracture surfaces revealed the existence and the potential impact of disturbances inside the bonding, such as bubbles or locally lacking adhesion, on the damage behavior and on related inferior mechanical performance. The main motivation for this kind of research is to improve confidence in the durability of bonded designs. Thus, our activities were focused on aspects which might affect durability from an application point of view, not from a purely academic one. Especially in Germany, the confidence of the authorities in this joining technique has to be strengthened by demonstrating a high degree of robustness in the application, and in view of the risk associated with potential in-field problems.
降解硅树脂粘结点支架的机械特性
粘接点支撑的拉伸载荷被认为是粘接材料的关键载荷情况,例如应用于此类夹具的硅酮。从耐久性的角度来看,双组分胶粘剂的以下缺陷预计会对这种加载机制的响应产生重大影响:胶粘剂组分的混合比例错误,由于机械混合程序不充分或不佳而导致的混合不均匀,胶粘剂粘合材料的负载降解,粘合的局部降解,例如气泡或粘合不良。为了研究这些方面,人们采用了不同的实验方法。在混合比方面,系统地进行了不同混合比的材料试验,以分析弹性和强度性能,而在其他主题上,对粘结点支架的拉伸试验进行了详细评估。建立了点支架在拉伸载荷下的循环试验,不同的周期振幅和最大峰值,以分析载荷历史对试件力学特性的影响。对于单调递增载荷作用下的点支架,通过对断口表面的定性分析,揭示了粘接内部存在气泡或局部不粘接等扰动,并对其损伤行为和相关的较差力学性能产生潜在影响。这种研究的主要动机是提高对粘合设计耐久性的信心。因此,从应用的角度来看,我们的活动集中在可能影响耐久性的方面,而不是纯粹的学术角度。特别是在德国,考虑到与潜在的现场问题有关的风险,必须通过展示应用中的高度稳健性来加强当局对这种连接技术的信心。
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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