T300/648复合材料迭层板接头挤压疲劳累积损伤问题的实验研究

EXPERIMENTAL STUDY ON CUMULATIVE DAMAGE OF T300/648 LAMINATES BUILT JOINTS

本篇论文根据“剩余强度,剩余刚度”理论,讨论了碳纤维增强复合材料迭层板承载孔的挤压疲劳损伤,应用孔的永久变形描述损伤的产生和扩展,提出了“损伤函数”的定义和测定方法,并提出了新的“疲劳损伤点”的概念。实验还研究了温度对连接孔静挤压强度和疲劳寿命的影响。实验结果表明,温度的影响尤为重要。对损伤失效试件,采用“揭层方法”、“X射线”及“SEM方法”进行检测和损伤机理的研究。

This paper debated the damage of the 'bearing fatigue' in CFRP laminates around a loaded hole, according to the theory of the 'residual stiffness' . It described the damage initiation and propagation by the permanent deformation of a circular hole. This paper gave the definition and measuring method for 'damge parameter' and the new notion of the 'fatigue damage point' . The testing program also was performed to study the effect of temperature and the fatigue life. The damaged specimens were detected and analysed by using 'deply technique' , X-ray radiographs' and 'scanning electron microscopy' to study the damage mechanisms.