Research on Mechanical Properties of the Contact Surfaces in Bolt Joints

doi:10.3969/j.issn.1000-1093.2015.05.027

Abstract

Abstract: The continuous smooth derivable principle of micro-convex asperity contact surface within the elastic, elastic-plastic and plastic contact deformations is applied to demonstrate the contact strength and the continuity and regional disparity of the practical contact surfaces under loading. A bolt structure model is established using the mixed-element method, and the practical contact area and the contact stress distribution are solved. The predicted results from finite element analysis（FEA）are highly correlated with the ones obtained from ultrasonic physical tests. The correctness and validity of the model are verified. The transmission effect of stress along the bolt joint direction is investigated through series of models, the continuity of the contact stress of the bolt joint in the annular region is further proved, and the effect laws of changing the pretightening force and structure geometric parameters on the bolt joint contact strength and the range of contact stress are discussed.

Key words: solid mechanics, mechanics of contact surface, contact strength, bolt joint, pretightening force, contact stress distribution

CLC Number:

O343
O344

ZHANG Yi-hua， LIN Dan-yi， YANG Guo-yu. Research on Mechanical Properties of the Contact Surfaces in Bolt Joints[J]. Acta Armamentarii, 2015, 36(5): 946-952.

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