Crack front mapping technique to understand behavior of fatigue cracks in lug joints

Prakash, Raghu V and Venkataswamy, MA and Krishnan, RV and Raju, KN (1997) Crack front mapping technique to understand behavior of fatigue cracks in lug joints. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    Abstract

    Lug joints arc considered as fatigue critical and the consequences of their failure can be severe aircraft structure. Application of fracture mechanics concepts to assess the damage tolerance of lug joints requires estimates of stress intensity factor as a function of crack size and shape. During experimental studies on fatigue crack growth behavior of lug joints, it is possible to estimate the surface crack length of fatigue cracks as a function of the cycles of loading. Information on growth kinetics is incomplete in the absence of clear information on the goowth of cracks within the lug bore. The above limitation restricts the capability of fatigue life prediction in lug joints.13; In an effort to find a way of determining crack front shape and size for a lug joint subjected to constant amplitude loading, a fractographic technique was evolved for mapping the crack front at various intervals of fatigue cycling prior to final failure. This report presents the details of the crack front mapping technique.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Electron fractography;Lug joints;Crack growth;Crack front mapping
    Subjects: ENGINEERING > Structural Mechanics
    Division/Department: Materials Science Division, UNSPECIFIED, Materials Science Division, Other
    Depositing User: Mr. N A
    Date Deposited: 29 May 2006
    Last Modified: 24 May 2010 09:41
    URI: http://nal-ir.nal.res.in/id/eprint/1410

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