The effect of bridging on fatigue crack growth behavior in Aramid Patched Aluminum Alloy(APAL)
作者： S. W. Oh , W. J. Park , C. W. Hue , H. K. Yoon , K. B. Lee
DOI: 10.1007/BF02944710
关键词:
摘要: A new hybrid composite (APAL: Aramid Patched Aluminum Alloy), consisting of a 2024-T3 aluminum alloy plate sandwiched between two aramid/epoxy laminate (HK 285/RS 1222), was developed. Fatigue crack growth behavior examined at stress ratios R=0.2, 0.5 using the and kinds APAL with different fiber orientation (0°/90° 45° for direction). The showed superior fatigue resistance, which may be attributed to bridging effect imposed by intact fibers in wake. magnitude estimated quantitatively determined technique on basis compliances specimens. rates specimens were reduced significantly as comparison monolithic not adequately correlated conventional intensity factor range(ΔK). It found that rate successfully effective range (ΔK eff =K br -K ct ) allowing closure bridging. relation da/dN theΔK plotted within narrow scatter band regardless kind ratio (R=0.2, 0.5) material (2024-T3 alloy, 0°/90° APAL±45°). result equation follow:da/dN=6.45×10−7(ΔK )2.4.
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