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 . Fastener failure backgroundSimilar to other metallic components, fas-tener failures include overload, corrosion-related cracking, embrittlement, creep, and fa-tigue.
• Max recommended load: 3150 lb • Recommended torque setting: 79 in.-lb • Material composition in accordance with ASTM A 574 specifies 10 different steel alloys, the majority of which are 41xx-series steels. Screws were analyzed to look for macroscopic indica-tions of failure mode. As shown in Fig. 3, fracture occurred in the threaded region.
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