Further numerical and experimental failure studies on single and multi-row riveted lap joints

Pavan Kumar, DVTG and Sathiya Naarayan, S and Kalyana Sundaram, S and Satish, Chandra (2012) Further numerical and experimental failure studies on single and multi-row riveted lap joints. Engineering Failure Analysis, 20 . pp. 9-24. ISSN 1350-6307

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    Abstract

    Riveted lap joints are being used traditionally for long in the aerospace industry. These joints are the crucial zones that are designed under damage tolerance procedures in the civil aircraft industry. Conventional design procedures of riveted lap joints are based on the assumption that all rivets carry equal load. As this assumption is not entirely valid as found in research literature associated with fatigue and fracture, it is important to investigate this point in terms of the static strength of the riveted joint as well. Hence, in the present study, riveted joint’s static strength experiments and numerical studies are carried out on four different (single and multi-row) riveted lap joints with strain gauges placed at specified locations. The experiments show that all the riveted lap joints sustained the estimated ultimate load and failed only after reaching or exceeding the joint failure load. All these riveted lap joints are analyzed by non-linear finite element method, considering the rivet yielding, plate yielding, geometrical nonlinear and secondary bending effects of the lap joint. The analysis of riveted lap joints shows that though there is unequal load distribution among the rivets in the elastic regime, once the rivets start yielding, significant redistribution of the load takes place among the rivets and the load sharing between the rivets is nearly equal at the failure load of the joint. The agreement between the finite element analysis strains and experimental strains is reasonably good at the failure load and this in conjunction with the aforementioned experimental finding proves that the rivets share nearly equal load at the joint failure load and justifies the conventional design methodology of riveted joints. To the authors’ knowledge no previous research evidence for such correlation was found and this paper confirms conventional design procedures are adequate, though complex interactions between the plate and rivets tend to exist based on non-linear behavior.

    Item Type: Journal Article
    Uncontrolled Keywords: Riveted joints, Joint failures, Damage tolerance, Fasteners, Finite element analysis
    Subjects: ENGINEERING > Structural Mechanics
    Division/Department: Structural Technology Division, Structural Technology Division, Structural Technology Division, Structural Technology Division
    Depositing User: Ms Indrani V
    Date Deposited: 12 Mar 2012 10:07
    Last Modified: 12 Mar 2012 10:07
    URI: http://nal-ir.nal.res.in/id/eprint/10378

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