基于模态分析的冲击能量与温度条件对碳纤维复材一阶固有频率的影响OA

To address issues such as fiber breakage and material extrusion caused by impact during the service of carbon fiber composites,the author proposed a dynamic non-destructive testing method based on modal analysis.Taking epoxy resin carbon fiber plates as the research object,drop hammer impact tests(single impact energy of 10-45 J)combined with modal analysis were conducted to investigate the effects of different impact energies and temperatures on the first-order natural frequencies of the material.Experimental results show a strong correlation between impact energy and the first-order frequency of carbon fiber plate.Additionally,low temperatures(-10℃)primarily affect the first-order natural frequencies when the single impact energy is 25-30 J.The medium and high temperature(40℃)has the strongest influence on the first-order natural frequency of the carbon fiber board when the single impact energy is 20 J.The high temperature(90℃)makes the first-order natural frequency change more smoothly.Compared with static methods,the dynamic non-destructive testing method based on modal analysis has the advantages of simpler operation,faster detection speed,lower detection cost,and a certain predictive capability for the critical state of internal material damage.