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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ULTRASONIC ATTENUATION RESULTS OF THERMOPLASTIC RESIN COMPOSITES UNDERGOING THERMAL AND FATIGUE LOADING
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ULTRASONIC ATTENUATION RESULTS OF THERMOPLASTIC RESIN COMPOSITES UNDERGOING THERMAL AND FATIGUE LOADING

机译：承受热和疲劳载荷的热塑性树脂复合材料的超声衰减结果

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摘要

Measurements of the ultrasonic slope of attenuation of thermoplastic composites undergoing large numbers of flight cycles were made. After as few as 300 flight cycles, samples showed localized areas of increased attenuation for the high strain protocol. After more than 4000 cycles of thermal-mechanical loading the thermoplastic samples showed significant increases in the attenuation data for both low and high strain testing. High strain level effects on thermoplastics were demonstrably greater than from low strain levels. The slope of attenuation increases approximately linearly with number of flight cycles in the thermoplastic composites. This behavior is distinctly different from thermoset composites that show little effects of aging until after 2500 flight cycles. Finally, attenuation measurements are indicating material changes long before mechanical testing is being affected.
机译：进行了经历大量飞行周期的热塑性复合材料的衰减的超声斜率测量。在短短的300个飞行周期后，样品就显示了高应变方案衰减增加的局部区域。在进行了4000次以上的热机械加载后，对于低应变测试和高应变测试，热塑性塑料样品的衰减数据均显着增加。可以看出，高应变水平对热塑性塑料的影响要大于低应变水平。衰减的斜率随着热塑性复合材料中飞行周期的数量近似线性增加。这种行为与热固性复合材料明显不同，热固性复合材料直到2500个飞行周期后才显示出很少的老化影响。最后，衰减测量表明，在机械测试受到影响之前，材料已经发生了变化。

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