Transcription of Fatigue of Threaded Fasteners - ASM International
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Fatigue of Threaded Fasteners - ASM International
Alex Hudgins*Brad James,*FASM Exponent FailureAnalysis AssociatesMenlo Park, Calif. ADVANCED MATERIALS & PROCESSES AUGUST 201418 Fasteners play a critical role in engineeredstructures as a method of nonpermanentjoining for the aerospace, infrastructure,civil, automotive, energy generation/distribu-tion, and many other industries. Fastener fail-ures can lead to disastrous consequences andsubstantial financial losses. One of the mostcommon fastener failure modes is Fatigue crackinitiation and growth. Inadequate design con-siderations, material problems, insufficient pre-load, loosening, and excessive loads can allcontribute to fastener Fatigue .
Hex-head case study A short case study highlights some common issues ob-served in fastener failures. In this example, multiple broken steel hex-head screws were submitted for failure analysis. These screws had been part of equipment used in a silicon wafer fabrication system. The screw service environment
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