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Single-fastener, double-shear laminate bearing strength by tensile testing

机译：单紧固件，双剪切层压板的拉伸强度测试

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摘要

As composite materials are used more extensively in structural applications, some test methods that once were considered very specialized and, therefore, not widely used, have become more significant. Methods for testing laminate bearing strength are one example. Although polymer-matrix composites lend themselves to assembly by adhesive bonding, some joints require disassembly to permit interior access, thus allowing for replacement in the event of damage and/or ease of transport. In these cases, joints are fastened mechanically. Mechanically fastened joints can be complex, with multiple fasteners arranged in a pattern such that the individual fasteners share the applied loading in a prescribed way. Determining how much of the applied loading bypasses a given fastener to be carried by adjacent fasteners can be a complex process that must be addressed analytically and, perhaps, verified experimentally. Such investigations depend, however, on accurate data about the response of a single fastener in bearing contact with the laminate. The need for these data motivates much of the current use of laminate bearing strength test methods.
机译：随着复合材料在结构应用中得到更广泛的使用，一些曾经被认为非常专业，因此未被广泛使用的测试方法变得更加重要。测试层压板承载强度的方法就是一个例子。尽管聚合物基复合材料可通过粘合剂粘合来进行组装，但某些接头需要拆卸才能进入内部，从而在损坏和/或运输方便的情况下可以进行更换。在这种情况下，将关节机械固定。机械紧固的接头可能很复杂，其中多个紧固件以一定的方式排列，使得各个紧固件以规定的方式分担施加的载荷。确定有多少施加的负载绕过要由相邻紧固件承载的给定紧固件，这可能是一个复杂的过程，必须通过分析来解决，并且也许必须通过实验来验证。但是，这种研究取决于有关单个紧固件与层压板接触的响应的准确数据。对这些数据的需求激发了当前层压板强度测试方法的大部分使用。

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