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首页> 外文期刊>Journal of Composite Materials >Estimation of residual flexural strength of unidirectional glass fiber reinforced plastic composite laminates under repeated impact load
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Estimation of residual flexural strength of unidirectional glass fiber reinforced plastic composite laminates under repeated impact load

机译：反复冲击载荷下单向玻璃纤维增​​强塑料复合材料层压板的残余弯曲强度估算

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The aim of this study is to investigate the effect of low-velocity multiple impacts at ambient (35?) and elevated temperature (65? and 85?) on unidirectional glass fiber reinforced plastic (GFRP) composites. Low-velocity repeated impact tests were conducted using a falling weight tower at a constant velocity of 1.5m/s. The dominant parameters such as energy, contact force, and deflection were recorded during multiple impacts. The residual strength of laminates following repeated impact was evaluated by conducting three-point bending tests with acoustic emission (AE) real time monitoring. The temperature was revealed to play a key role in the impact response of composite materials, especially due to the progressive softening of the epoxy matrix. The nature and extent of damage during multiple impacts at ambient and elevated temperatures was investigated using real time AE monitoring: this analysis indicated delamination as a predominant failure mode, whose extent and criticality depended on temperature and number of impact events.
机译：这项研究的目的是研究在环境温度（35？）和高温（65？和85？）下低速多次撞击对单向玻璃纤维增​​强塑料（GFRP）复合材料的影响。使用下落的重物塔以1.5m / s的恒定速度进行低速重复冲击试验。在多次撞击中记录了主要参数，例如能量，接触力和挠度。通过进行声发射（AE）实时监控的三点弯曲测试，评估了反复冲击后层压板的残余强度。发现温度在复合材料的冲击响应中起关键作用，特别是由于环氧基质的逐渐软化。使用实时AE监视研究了在环境和高温下多次撞击过程中损坏的性质和程度：此分析表明分层是主要的失效模式，其破坏程度和严重程度取决于温度和撞击事件的数量。

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