The residual static strength of fatigue cracked lug specimens of four aluminium-copper alloys
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Abstract
Residual static strength data from cracked fatigue specimens has been obtained for four aluminium-copper alloys; DTD5014 (RR58) , 2L65, 2024-T81, and HID54 (Al 6% Cu). It is concluded that all the materials are crack sensitive and an order of merit of the relative crack sensitivities of the materials is established. The order of merit is in general agreement with work by other investigators but appears to be at variance with that indicated by the limited fracture toughness information availab1e. The relationship between residual statie strength and crack area is unaffected when the fatigue test is interrupted by a period of ageing or creep but is affected by static loading conditions. The reduction in residual static strength during fatigue life is estimated and is shown to depend on the level of alternating stress; at low alternating stress cracking appears very early in the life with a consequent early fall in strength.