纤维复合材料包裹钢管冲击功响应分析

Impact work and dynamic performance analysis of steel tube wrapped with fiber reinforced polymer

对冲击功曲线在三个发展阶段的特征进行探讨,研究了结构的抗冲击性能评价指标并对侧向冲击作用下玻璃纤维复合材料(GFRP)包裹钢管的动力响应与抗冲击性能进行了分析。结果表明:冲击功曲线在各个阶段呈现不同特征,平台阶段冲击功的增加值占总冲击功的比重最大,显著影响全程的冲击功发展。抗冲击性能评价指标主要包括吸能、冲击力平台值及耗能系数。GFRP厚度的增加提高了试件的强度及整体刚度,使试件在更小的位移内所吸收的能量增加,改善了抗冲击性能;不同冲击能量下冲击力平台值与耗能系数稳定。速度峰值随GFRP厚度的增加而提高,而试件的最大位移与应变减小;由于在冲击过程中存在能量损耗,试件的吸能值小于落锤初始动能。

The developmental features of impact energy in three phases are discussed and the evaluation indicators of structure impact resistance are researched. On this basis, the dynamic response and impact resistance of steel tubes wrapped with Glass Fiber Reinforced Polymer(GFRP) composites subjected to lateral impact load are analyzed in this paper. The results show that the impact energy curve exhibits different characteristics in respective phases. The impact energy added in plateau phase accounts for the largest proportion of the total impact energy and have remarkable effect on the whole process of impact. The evaluation indicator of impact resistance mainly includes energy absorption, platform value of impact force and energy dissipation coefficient. The strength and global stiffness of specimen are improved with the increase of GFRP wall thickness and the absorption of impact energy increases within less displacement, thus the impact resistance of specimen is enhanced. The impact forceplatform value and energy dissipation coefficient remain stable under different impact energies. The peak value of velocity increases as the thickness of GFRP increases, while the maximum displacement and strain of specimen decrease. The absorption of energy is less than initial kinetic energy of hammer due to the energy loss in the process of impact.