Structural Analysis of the Walleye Mark 13 Container Cover

摘要

This detailed structural analysis of the WALLEYE MARK 13 container cover assembly included limited nondestructive thermal testing to delineate polyvinyl chloride material dimensional stability to elevated temperatures. A detailed review of existing cover assembly inspection and repair procedure was also performed. The structural analysis investigated the concentrated stress sensitivity of the cover assembly to (undersized) width/length variations. In particular, cover stress concentrations were delineated which could occur during 'latching down' procedures of the cover to the base assembly. Stress analysis of the cover assembly demonstrated a significant sensitivity of cover stress levels to cover width and length variations from its base assembly, while the thermal testing suggested a possible cause of the failure problem. The proposed maintenance, inspection and repair procedures defined in NAVAIR Technical Manual 11-70KAA-1 should significantly reduce the potential of crack reoccurrence. However, geometric irregularities associated with difficult-to-repair cracks within the aluminum extrusion could be the source of crack re-initiation under normal cradle operational conditions. Keywords: Polyvinyl chloride; Guided weapon components; Dimensional stability; Reliability; Maintainability. (edc)