【摘要】 对纤维增强复合材料层合梁在受轴向冲击时的动力响应问题进行了实验研究。实验以单向玻璃纤维布和环氧树脂材料制作试件,在层间预埋薄铜箔模拟脱层损伤。采用激光测速仪测量子弹速度,动态应变仪和TDS420A数字示波器记录应变时程曲线进行动力响应分析。实验结果表明铺层角度是决定材料性能的主要原因,脱层损伤的存在及大小对动力响应和发生动力屈曲有重要影响。此外,初始缺陷的影响也是不可忽视的重要因素。更多还原

【Abstract】 An experimental study on dynamic pulse response behavior of fiber reinforced plastic(FRP) beams with delaminations subjected to axial impact by moving mass is presented.The specimens were manufactured by unidirectional E-glass fiber fabric and epoxy resin with , and ply sequences and different initial imperfections.The delamination of beam was simulated by copper foils between designed plies.The data of bullet velocities and time history curves of strain were recorded respectively by laser setup,high dynamic strain indicator and TDS420A oscilloscope.The experimental results show that the ply sequences play a significant role in laminated composite material properties and delaminations have a significantly effect on dynamic pulse response of laminated beams.Moreover the initial imperfection is another important factor that can’t be neglected.更多还原