Solution For Creep Fracture Mechanics Parameter C~* Based On Reference Stress Method And Application In Engineering

It is great practical significance to the energy, chemicals industry, aerospace industry and other fields to give the evaluation of high-temperature structural integrity. Ensure the integrity of the high-temperature structure is safe production and to increase production efficiency, such as industrial equipment in the field of aging, a lot of equipment has been close to the design of life or face failure in advance, and other industry issues. The evaluation of the structural integrity can be used to avoid premature retirement of equipment and forecast its useful life time and failure to fully tap its utilization. Creep fracture failure is the main failure of the structure of the high-temperature form, Creep fracture parameters is an important parameter of high temperature structural integrity in assessment.Reference stress as a similar approach works in the field of fracture mechanics are widely used. In this paper, based on the reference stress method, the use of heterogeneous computing sample limit load equivalent material and concluded the concept of solving non-homogeneous materials creep fracture parameters. At the same time, to non-linear ABAQUS software for the simulation tools, the verification is given to the results with the use of the reference stress method Reference stress as a similar the main research results are as follows:1)The introduction of the concept of non-match limit load, at the same time with the material described in the virtual reality of the material stress-strain relationship, the tow are combined to solve creep fracture parameter C~* with reference stress, then non-homogeneous materials will be translated into the calculation of the virtual homogeneous materials for solving the problem.2) With reference stress method, four kinds of different weld seam width of the center-cracked CT sample creep fracture parameters C~* are calculated in theory, and some of the standard sample in the creep fracture test of strengths and deficiencies were compared.3) To the limit load for solving the reference stress is given to sum up, and solving creep fracture parameters C~* with the reference stress method amend and equivalent stress method are given the appropriate formulas.4) The ABAQUS finite element software is used to finite element simulate on four different weld seam width of the center-cracked CT sample . The impact on width of the weld on the changes in creep fracture parameters C~* is analyzed . The results that were calculated by reference stress method are verified and compared. The results showed that the reference stress method used to calculate the welding pieces of creep fracture parameters is feasible.5) Analysis the practical application of creep fracture parameters C in engineering that were calculated by reference stress method. Gives the evaluation process, and applied to actual cases.