DEVELOPMENTS IN FRACTURE MECHANICS-BASED STRUCTURAL INTEGRITY OF WELDMENTS
Fracture mechanics based remaining life prediction methods are routinely applied to equipment operating in the creep and creep/fatigue range by assessing crack initiation and growth from existing defects. These procedures are relevant to fossil, nuclear power generation, chemical and aerospace industries. The methodologies have in most cases been developed for homogenous materials. However weldments which could contain inhomogeneity and micro-cracks as well as residual stresses in their microstructure are invariably the weak link in the structure. Hence extension, improvement and validation of predictive methods are the logical next step. Under the auspices of the Versailles Agreement on Materials and Standards (VAMAS) committee standardization methods for testing analysis and novel applications are developed. This information is filtered into standards and Codes of Practice such as in ASTM, BSI and the British Energy’s R6/R5, the French A16 and the US API codes. This paper highlights the methodologies for testing analyzing and assessing crack initiation and growth in weldments. Factors that need to be identified in life assessment of weldments and welded components are discussed and related to the objectives in the VAMAS TWA31 working on ‘Creep/Fatigue crack growth of weldments containing residual stresses’.
Kamran Nikbin
Imperial College London, Mechanical Engineering Dept., Exhibition Road, London SW72AZ, UK
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）