Application of an elastoplastic boundary-element method to some fracture-mechanics problems

✍ Scribed by T.A. Cruse; E.Z. Polch

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 979 KB
• Volume: 23
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(86)90149-9

✦ Synopsis

The boundary-integral equation (BIE) method for 3D elastic fracture mechanics has been extended to the elastoplastic problem. The formulation makes use of a special elastic Green's function for the crack, thereby eliminating the need to model the crack itself. Application of the general formulation is made to problems of localized or limited plasticity. Such problems occur through the local yield of stress concentrations, together with the plastic field of the crack tip. In these problems, the elastic stress intensity factor still provides a useful characterization for cyclic-crack-growth predictions. This paper reports on an accurate and efficient calculation procedure for crack-tip stress intensity factors for cracks in welds and prestressed bolt holes, where untracked plastic strains are important. The use of the new algorithm for crack-tip plasticity modeling is expfored for small-and large-scale plasticity conditions.