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Low velocity impact induced damage evaluation and its effect on the residual flexural properties of pultruded GRP composites

机译:低速冲击诱导损伤评估及其对拉挤玻璃纤维复合材料残余弯曲性能的影响

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摘要

Low velocity impact induced non-penetration damage in pultruded glass fibre reinforced polyester (GRP) composite materials was investigated using an instrumented falling weight impact test machine with a chisel shaped impactor. The characteristics of the impact event, force/time and force/deflection traces were determined. The internal damage was visualised and quantified by Electronic Speckle Pattern Interferometry (ESPI) in terms of the thickness, density and uniformity degradations of fringe patterns. There is a linear relationship between the impact energy and the identified damage areas. The post impact structural integrity of impacted specimens was evaluated by three point bending tests. It reveals that there is a significant reduction in flexural properties due to the impact-induced damage and that the residual flexural strength is more susceptible to damage than residual modulus.
机译:使用带凿子形冲击器的仪器化落锤冲击试验机研究了拉挤玻璃纤维增​​强聚酯(GRP)复合材料中低速冲击引起的非渗透损伤。确定了冲击事件,力/时间和力/偏转轨迹的特征。内部缺陷通过电子斑点图案干涉术(ESPI)可视化并量化了条纹图案的厚度,密度和均匀性下降。冲击能量与确定的损伤区域之间存在线性关系。通过三点弯曲试验评估了冲击试样的冲击后结构完整性。结果表明,由于冲击引起的破坏,弯曲性能显着降低,并且残余弯曲强度比残余模量更容易受到破坏。

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