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Clamshell marks .

In many polsrmers, fatigue striations can be observed at relatively high AFC levels. These striations correspond to the successive location of the advancing crack front after each loading cycle or local crack jump. There is a clear distinction between macroscopically observed clamshell markings, which represent periods of... [Pg.3078]

Often features of a fatigue fracture are visible, such as beach marks or clamshell marks and stria-tions. Beach marks or clamshell marks may be seen in fatigue failures of materials that are not in continuous use. They may be used for a period of time, allowed to rest, and then used again. Striations are thought to be steps in crack propagation. Thousands of striations may be found within each beach mark. [Pg.23]

Aluminum alloy 7079-T6 aircraft wing spar (a) showing crack (arro. m Fracture surfaces of opened spar crack. Note clamshell marks at termination of the crack (left). [Pg.123]

See other pages where Clamshell marks . is mentioned: [Pg.3079]    [Pg.80]    [Pg.467]    [Pg.277]    [Pg.448]    [Pg.119]    [Pg.3079]    [Pg.80]    [Pg.467]    [Pg.277]    [Pg.448]    [Pg.119]    [Pg.86]    [Pg.23]   


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