关键词: 纤维金属层板, 裂纹扩展速率, 疲劳寿命

Abstract:

Based upon the characteristic of self balancing crack growth of fiber reinforced metal laminates (FRMLs), a material constant, the equivalent crack length of FRMLs, was first found, the stress intensity factor equation of FRMLs during fatigue was analytically determined, and a phenomenological model for predicting crack growth in FRMLs was developed. This phenomenological model can be applied not only to the center cracked laminates, but also to the edge cracked ones. The present model was exercised on both the center crack tension (CCT) specimens and the single edge notch tension (SENT) specimens of 2/1 GLARE and 3/2 GLARE. The ratios of the predicted to experimental lives from saw cut tip to 80 percent of specimen width for the CCT specimens of 2/1 and 3/2 GLARE were 1.05 and 1.07, respectively, and 1.12 for the SENT specimens of GLARE. The present phenomenological model is not only accurate, but also easy to use. It requires no knowledge of bridging traction and delamination growth, and all the operations in this model are analytical, therefore it will greatly facilitate engineering applications.

Key words: fiber r einfor ced metal laminates, cr ack gr owth, fat igue lives