banner.jpg 060 Stress Intensity Factor Evaluation for Cracks Emanating from a Bolt Hole of Pressurized, Pretensioned Flanged Bolted Joints P. Padmanabhan1, Raghu V. Prakash2 and R. Muthukumar3 1IPRC / ISRO, Mahendragiri, India. padmanabhan_p@iprc.gov.in 2Department of Mechanical Engineering, IIT Madras, Chennai, India. raghuprakash@iitm.ac.in 3LPSC/ISRO, Trivandrum, India. r_muthukumar@lpscv.gov.in ABSTRACT

In this study, numerical evaluation of Stress Intensity Factor (SIF) for corner and edge cracks in a bolt hole of pressurized, pre-tensioned ANSI 16.5 one inch flanged joint is carried by varying parameters like bolt pre-tension, internal pressure and event of one bolt failure. Mode-1 SIF is predominant in all cases. SIF value increases with increase in bolt pre-tension and internal pressure. Effect of internal pressure increase on SIF is less. SIF is maximum for cracks at flange interface. Influence of a bolt failure on SIF is observed to be less significant.

Keywords: Flanged joints, Stress Intensity Factor (SIF), Bolt pre-tension, Fatigue life.

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