Abstract
Lug joints with fasteners play a vital role in connecting major components of flight vehicles by acting as primary load carrying members. The structural integrity of these fastener joints and in particular fatigue life is of prime concern from the design point of view. Cold working of holes is one of the methods of achieving enhancement of fatigue life of these joints and this aspect is computationally addressed in this paper. The process of cold working is modeled, consists of introduction of a large diameter mandrill into the hole and withdrawing it leaving behind plastically stretched material around the hole periphery. Later one can use this hole with interference or clearance fit pins for better fatigue life. Material non-linear analysis is employed during the cold working process. These issues are addressed in this paper through computational approach using FEM software MSC NASTRAN/PATRAN. The fatigue life is computed at the identified critical locations through stress analysis using modified Basquin’s equation with Morrow’s mean stress effect. Life of the lug joints before and after cold working of the hole are estimated and compared.
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