FITNET ASSESSMENT OF LOW CONSTRAINT COMPONENTS,PROPOSAL FOR AN OVERALL CONSTRAINT ASSESSMENT METHODOLOGY AND ITS VALIDATION
Fracture assessment of a structural component by the standard and advanced J-integral based options (Options 1-4) given in the FITNET Fracture Module 1 utilises fracture toughness data derived from deeply notched fracture mechanics test pieces. These represent a high level of constraint (high stress triaxiality) that may result in excessive conservatism. A source of the conservatism is that the triaxiality of the stress field in the vicinity of a shallow flaw in a structural component can be lower than that in a deeply notched test specimen. Such a situation is usually referred to as “loss of constraint. In addition, stress fields with low triaxiality occur near non-sharp defects. The ability to allow for the loss of constraint is potentially of great practical significance. The advanced Option 5 (Constraint Analysis) of the FITNET Fracture Module and Section 12.5 (for treatment of non-sharp defects) provide fracture assessment tools which take into account in-plane loss of constraint (triaxiality).
S. Cicero F.Gutiérrez-Solana J.A.álvarez S.Webser A. Horn R A. Ainsworth
University of Cantabria, Spain Corus RT&D, United Kingdom British Energy, United Kingdom
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）