Development of the Linear Matching Method and its ?￠?€?? Software Tool for the Design and Life Assessment of Mechanical Structures

摘要

The design of structural components that are subjected to high temperatures requires understanding the relationship between a range of possible failure modes and the history of temperature and mechanical loading. Traditionally this relationship has been made through the use of structural mechanics concepts, and expressed in terms of failure laws and rules that form the fabric of current design codes and life assessment methods. These codes and methods are usually based on results from linear elastic FE assessments, which produce too conservative solutions. An alternative detailed simulation allows the investigation of any type of load cycle, but inevitably involves significant computer effort for complex practical structures. For high temperature power plant, where the geometries are highly varied and the loading history may not be known in detail, simplified methods still dominate. In life assessment methods there is the further issue that available material data may be limited and the presence of cracks and welds needs to be taken into account.