Probabilistic elastic-plastic fracture analysis of circumferentially cracked pipes with finite-length surface flaws

Conference · Sun Dec 01 04:00:00 EST 1996

OSTI ID:403233

Rahman, S ^[1]

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1. Univ. of Iowa, Iowa City, IA (United States). Dept. of Mechanical Engineering

A new probabilistic model was developed for predicting elastic-plastic fracture response of circumferentially cracked pipes with finite-length, constant-depth, internal surface flaws subject to remote bending loads. It involves engineering estimation of energy release rate, J-tearing theory for characterizing ductile fracture, and standard methods of structural reliability theory. The underlying J-estimation model is based on deformation theory of plasticity, constitutive law characterized by power law model for stress-strain curve, and an equivalence criterion incorporating reduced thickness analogy for simulating system compliance due to the presence of a crack. New equations were developed to predict J-integral and were evaluated by comparing with available finite-element results from the current literature. Both analytical and simulation methods were formulated to determine the probabilistic characteristics of J. The same methods were used later to predict the probability of crack initiation and net-section collapse as a function of the applied load. Numerical examples are provided to illustrate the proposed methodology.

• OSTI ID: 403233
• Report Number(s): CONF-960706--; ISBN 0-7918-1770-9
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKS
FOSSIL-FUEL POWER PLANTS
FRACTURE MECHANICS
MATHEMATICAL MODELS
NUCLEAR POWER PLANTS
OFFSHORE PLATFORMS
PIPELINES
PIPES
SYSTEMS ANALYSIS