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Low-velocity impacts on preloaded GFRP specimens with various impactor shapes

机译：低速冲击各种形状的预加载GFRP标本

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摘要

The simultaneous effect of impactor shape and biaxial preload on the impact response of thin glass fibre reinforced polyester laminates is investigated herein. Using a specially designed drop weight test rig, specimens were impacted at initial impact energies of 4 J and 6 J using steel flat, hemispherical, ogival and conical impactors, all 12mm in diameter. Biaxial tension of 500 and 1000 microstrain was applied to the specimens. The applied levels of preload were found to have little effect on the impact response of the GFRP specimens. Due to the stiffening effect of the biaxial tension, the contact duration and deflection were found to decrease with increasing preload. However, the peak force, absorbed energy and damage area were largely unaffected by the preload. The indentation depth produced by the conical impactor at 4 J increased significantly as preload was applied. However, this did not correspond to an increase in damage area.
机译：本文研究了冲击器形状和双轴预紧力对薄玻璃纤维增​​强聚酯层压板的冲击响应的同时影响。使用专门设计的落锤试验台，使用直径均为12mm的扁平，半球形，球形和锥形冲击器以4 J和6 J的初始冲击能冲击样品。对样品施加500和1000微应变的双轴张力。发现施加的预紧力水平对GFRP试样的冲击响应影响很小。由于双轴张力的加强作用，发现接触时间和挠度随预紧力的增加而减小。但是，峰值力，吸收的能量和损坏区域在很大程度上不受预紧力的影响。随着施加预紧力，圆锥形冲击器在4 J处产生的压痕深度显着增加。但是，这并不对应于损坏面积的增加。

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