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首页> 外文会议>NDE-vol.26; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >EVALUATION OF SOLID PARTICLE EROSION DAMAGE ON E-GLASS/EPOXY COMPOSITES USING ACOUSTIC EMISSION ACTIVITY
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EVALUATION OF SOLID PARTICLE EROSION DAMAGE ON E-GLASS/EPOXY COMPOSITES USING ACOUSTIC EMISSION ACTIVITY

机译：利用声发射活性评估电子玻璃/环氧树脂复合材料上的固体颗粒腐蚀损伤

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摘要

The effect of solid particle erosion on the strength properties of E-glass/epoxy composite was investigated. Solid particle erosion with SiC particles 400 μm to 500 μm in diameter was simulated on 12 ply [45°/-45°/0°/45°/-45°/0°]_S E-glass/epoxy composites with constant particle velocity of 42.5 m/s at impact angles of 90°, 60°, and 30° for 30, 60, 90 and 120 seconds. Damaged and undamaged specimens were subjected to tensile tests while monitoring their acoustic emission (AE) activity. An erosion damage parameter was defined as a function of the particle impact angle and erosion duration to determine the residual tensile strength of the composite. Scanning electron microscope (SEM) images of the erosion damaged specimens revealed the same damage mechanism occurred at different impact angles. The distribution of AE events by event duration, ring down counts and energy distribution were used to characterize the different damage mechanisms that occurred during tensile loading of damaged and undamaged specimens. The results showed AE activity could be used to distinguish between different damage mechanisms within the composite, such as fiber/matrix debonding, delamination and fiber fracture. The Weibull probability distribution model and the AE stress delay parameter model were developed to relate the AE activity to the erosion damage and residual strength. The results showed both the Weibull probability model and the stress delay model could be used to predict residual strength of the composites.
机译：研究了固体颗粒侵蚀对电子玻璃/环氧树脂复合材料强度性能的影响。在12层[45°/ -45°/ 0°/ 45°/ -45°/ 0°] _S具有恒定颗粒速度的E玻璃/环氧树脂复合材料上模拟了直径为400μm至500μm的SiC颗粒对固体颗粒的侵蚀在90°，60°和30°的冲击角下，最大速度为42.5 m / s，持续30、60、90和120秒。在监测其声发射（AE）活性的同时，对损坏和未损坏的样品进行拉伸测试。将侵蚀破坏参数定义为颗粒冲击角和侵蚀持续时间的函数，以确定复合材料的残余拉伸强度。腐蚀损坏样品的扫描电子显微镜（SEM）图像显示，相同的损坏机理发生在不同的冲击角度。通过事件持续时间，振铃次数和能量分布的AE事件分布来表征损坏和未损坏样本的拉伸载荷过程中发生的不同损坏机制。结果表明，AE活性可用于区分复合材料内的不同损伤机制，例如纤维/基质的剥离，分层和纤维断裂。建立了威布尔概率分布模型和AE应力延迟参数模型，以将AE活动与腐蚀破坏和残余强度联系起来。结果表明，Weibull概率模型和应力延迟模型均可用于预测复合材料的残余强度。

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