ハイブリッドCFRP-Al材の疲労挙動と力学特性
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概要
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Aluminium is, in general, being used as a light structural material, but the demand for light structural materials with better mechanical properties than aluminium is increasing more and more recently. Such demand may be satisfied with the hybrid CFRP-Al construction. This paper is concerned with the bending strength and the fatigue strength of the hybrid CFRP-Al construction which is made of the combination of aluminium and carbon fiber reinforced plastics (CFRP). The results obtained are as follows : Hybrid-A, bonded with Redux BSL 408, has shown about 2 times the bending strength of aluminium, and hybrid-B, bonded with Redux BSL 308, has shown about l.4 times. On the process of fatigue, the rigidity of aluminium decreases suddenly just before the rapid fatigue failure, but the rigidity of hybrid CFRP-Al gradually decreases with increasing the number of cycles to failure. As for the mode of fatigue failure, it is shown that the failure of aluminium is due to the separated breaking, but that of hybrid CFRP-Al is due to the interfacial failure at less than 104 cycles and to the development of microcracks formed in aluminium part at higher cycles. Both hybrid-A and -B have shown about 2 times the fatigue strength of aluminium, and therefore it is considered that the fatigue strength of aluminium is improved by the hybrid construction. It is also found that the calculated value of (σ_<H_y>)_f/(σ_c)_f, the ratio of fatigue strength of hybrid CFRP-Al to that of aluminium, is in good agreement with experimental results.
- 1975-02-15
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