Fatigue Properties of Impact Damaged Composites Reinforced with Z-Pins
This paper presents an experimental study into the use of z-pins to increase the compression fatigue properties of carbon-epoxy composites containing barely visible impact damage. The study investigates the effect of increasing z-pin content (up to 4％ by volume) on the postimpact compression fatigue properties and fatigue mechanisms. The study reveals new insights into the impact damage resistance of z-pinned composites. Z-pins are found not to improve the damage resistance of composites until the impact energy exceeds a threshold level, above which the amount of impact-induced damage decreases whereas the absorbed impact energy density of the material increases with increasing z-pin content. The reduction in the amount of high energy impact damage due to z-pins results in an improvement to the post-impact compression fatigue performance of z-pinned composites compared to the control composite without z-pins. Fatigue life (S-N) curves presented in the paper show that the fatigue life, fatigue strength and fatigue endurance limit of impact damaged composites increase with the volume content of z-pins. The improvement in compression fatigue performance due to z-pins is attributed solely to the reduction in the amount of impact damage, and it is found that pins do not affect the fatigue mechanism or fatigue damage growth rate.
Polymer matrix composites (PMCs) z-pin impact damage fatigue.
M.D. Isa S.Feih A.P. Mouritz
School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, GPO Box 2476V, Melbo Malaysian Institute of Aviation Technology, University of Kuala Lumpur, 43800 Dengkil, Selangor, Mal
国际会议
2011年亚太航空航天技术学术会议(APISAT 2011)
澳大利亚
英文
1-14
2011-02-28（万方平台首次上网日期，不代表论文的发表时间）