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首页> 外文会议>Sixth Symposium on Composites: Fatigue and Fracture 16-18 May 1995 in Denver, Colorado >The Influence of Trasverse Bearing Loads Upon the Bypass Strength of Composite Bolted Joints
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The Influence of Trasverse Bearing Loads Upon the Bypass Strength of Composite Bolted Joints

机译：横向轴承载荷对复合螺栓连接旁路强度的影响

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The performance of biaxially loaded composite joints was examined at the coupon level using a simple, low-cost test apprratus designed to apply transverse bearing loads independent of longitudinal bypass loads. The apparatus consisted of clevises. load links, and attachments to test machine supports. Bending and extensional strain gage bridges were placed on the load links to measure transverse bearing stress levels as longitudinal bypass loads were applied and used to determine when bearing damage initialed. Two larminate configurations wre examined to compare transverse bearing effects in relatively high and low stiffness laminates At low bearing stress levels transerse bearing was found to be a less damaging load condition than longitudinal on-axis bearing, however, bearing-related failure modes became prominent at lower stress levels in the transverse loading case than in the on-axis case. High stiffness laminates exhibited greater sensitivity to transverse hole deformation, laminate damage, and fastener torque than low stiffness laminates. Experimental data were compared with failure predictions generated with the Boeing developed BEARBY analysis code. Predictions for the high stiffness laminate were in general agreemen with test results. but were conservative for the low stiffness laminate as bearing damage relieved the stress conecntration.
机译：使用简单，低成本的测试装置，在样片水平上检查了双轴加载的复合材料接头的性能，该装置设计为独立于纵向旁路载荷地施加横向轴承载荷。该设备由U形夹组成。加载测试机器支持的链接和附件。将弯曲应变计和拉伸应变计桥放置在载荷连杆上，以测量施加纵向旁路载荷时的横向轴承应力水平，并用于确定轴承损坏何时开始。研究了两种层状结构，以比较较高和较低刚度的层压板中的横向轴承效应。在较低的轴承应力水平下，横向轴承的破坏性载荷小于纵向同轴轴承，但是，与轴承相关的失效模式在横向负载情况下的应力水平低于同轴情况。与低刚度层压板相比，高刚度层压板对横向孔变形，层压板损坏和紧固件扭矩的敏感性更高。将实验数据与波音开发的BEARBY分析代码生成的故障预测进行了比较。高刚度层压板的预测总体上与测试结果一致。但是对于低刚度层压板却比较保守，因为轴承损坏减轻了应力集中。

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