Effects of biaxial loading and residual stresses on constraint

Finite element analyses have been carried out to determine the elastic stress intensity factors, the plastic limit loads, failure assessment diagrams (FADs) and the T- and Q-stresses for each of three postulated defects. The effect of biaxial loading and residual stresses on the stress intensity fac...

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Bibliographic Details
Published in:The International journal of pressure vessels and piping 2003-11, Vol.80 (11), p.755-773
Main Authors: Burdekin, F.M., Xu, W.G.
Format: Article
Language:English
Subjects:
Applied sciences
Biaxial loading
Computational techniques
Constraint
Elasticity. Plasticity
Exact sciences and technology
Finite-element and galerkin methods
Fracture mechanics (crack, fatigue, damage...)
Fracture mechanics, fatigue and cracks
Fundamental areas of phenomenology (including applications)
Mathematical methods in physics
Mechanical engineering. Machine design
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Physics
Residual stresses
Solid mechanics
Steel design
Steel tanks and pressure vessels
boiler manufacturing
Structural and continuum mechanics
Surface defects
Weld mismatch
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Summary:Finite element analyses have been carried out to determine the elastic stress intensity factors, the plastic limit loads, failure assessment diagrams (FADs) and the T- and Q-stresses for each of three postulated defects. The effect of biaxial loading and residual stresses on the stress intensity factor and T and Q-stress solutions, and the effect of weld-base metal mismatch on the plastic limit load were assessed. Results have also been derived for the reduction in constraint with increasing plasticity up to the limit load. For assessments of a narrow mismatched weld of overmatching strength using standard Option 1 or 2 FADs, up to L r =1, this parameter should be determined using the lower strength base material yield strength. The decrease in constraint with increasing L r varies at different positions around the crack front of semi elliptical surface defects. Although constraint is maintained highest just under the free surface towards the ends of the crack, this is generally the region where the stress intensity factor is lowest for tension loading and thus assessments need to take account of both crack tip driving force and constraint.
ISSN:0308-0161
1879-3541
DOI:10.1016/j.ijpvp.2003.01.001