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首页> 外文会议>Joint American Society for Composites / American Society for Testing and Materials Committee Technical Conference >An Apparatus for Shear Strength and Fully-Reversed Shear Fatigue of Composites and Sandwich Materials
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An Apparatus for Shear Strength and Fully-Reversed Shear Fatigue of Composites and Sandwich Materials

机译：一种用于剪切强度和完全反向剪切疲劳的复合材料和夹层材料的装置

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摘要

In-plane shear and shear-fatigue loading of composites and sandwich materials are important loading modes for many engineering structures. A new experimental apparatus that allows evaluation of ambient and elevated temperature monotonic shear and fully-reversed shear-fatigue properties of composites and sandwich materials is discussed. Test results are provided for a Ni-base metallic honeycomb material (representative of a hot-surface thermal protection system [1]) and for a polymeric sandwich material (glass-fiber/epoxy-facesheets with a PVC foam core) used in naval applications. The test apparatus, and observed failure modes of these materials are discussed, as well as recommendations to further improve the experimental approach. Due to the experimental complexity, current test methods make it difficult to achieve pure shear loading and do not address fully-reversed shear fatigue. Moreover, ASTM standards for shear tests (D4255 [2], C273 [3] and C394 [4]) are based on sandwich materials and do not cover shear of metallic materials.
机译：复合材料和夹层材料的面内剪切和剪切疲劳负载是许多工程结构的重要装载模式。探讨了允许评估环境和升高的温度单调剪切和复合材料和夹层材料的完全反转剪切疲劳性能的新实验装置。用于Ni-Base金属蜂窝材料（代表热表面热保护系统[1]）和用于海军应用的聚合物夹层材料（具有PVC泡沫核心的玻璃纤维/环氧树脂核心）的测试结果提供了测试结果。讨论了测试装置和观察到这些材料的失效模式，以及进一步提高实验方法的建议。由于实验复杂性，目前的试验方法使得难以实现纯剪切载荷，并且不会涉及完全反转的剪切疲劳。此外，剪切试验的ASTM标准（D4255 [2]，C273 [3]和C394 [4]）基于夹心材料，不覆盖金属材料的剪切。

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