Correction method used for creep crack growth numerical simulation result

Abstract

The invention relates to a correction method used for a creep crack growth numerical simulation result. The correction method comprises the following steps of: (1) through finite element software ABAQUS, calculating a creep crack growth process, and obtaining a relationship among crack growth length, load linear displacement and time (t); (2) comparing a creep crack growth situation obtained by numerical simulation with an experiment result, and if the creep crack growth situation and the experiment result are matched but the load linear displacement obtained by calculation is smaller than the experiment result, correcting the load linear displacement; (3) utilizing a secant method to calculate the linear displacement rate and the crack growth rate of the corrected load linear displacement; and (4) adopting the corrected load linear displacement rate to calculate a load level (C*). The correction method is suitable for the correction of a creep crack growth simulation result of an element failure technology, and has the advantages of being simple in operation and accurate in results.

Description

technical field [0001] The invention relates to a correction method for numerical simulation results of creep crack growth, which belongs to the field of numerical simulation of creep crack growth. Background technique [0002] In modern industry, in order to improve the utilization rate of energy, develop new energy, reduce the emission of harmful gases and other pollutants. Industrial devices such as power generation, aviation, chemical industry, and nuclear energy are all developing towards high temperature and high pressure. Creep rupture of metal structures is one of the main forms of failure in high temperature environments. In engineering, about 30% of pipeline failures in boilers and heavy equipment are caused by creep rupture. The difficulty of the creep problem is that the creep damage gradually accumulates in the material, and usually breaks suddenly without obvious signs, which brings serious losses to production and even leads to serious casualties. Therefore...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes a correction method for the numerical simulation results of creep crack growth, which can be used to solve the problem that the correlation curve between the crack growth rate and the load level in the creep crack growth results of the unit failure technology simulation is larger than that of the test The problem of the results, so that the simulation results coincide with the experimental results

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