An Equivalent Acceleration Method for Creep Loads Based on Consistent Failure Modes

Abstract

The invention discloses a creep load equivalent acceleration method based on consistent failure modes. Minimum creep rate law and fracture strain law, calculate the value of parameter p in the creep damage accumulation model; divide the failure mode consistency interval of variable temperature and variable load creep load; use multi-stage variable temperature and variable load creep non-linear damage accumulation The model calculates the damage caused by the creep load in the failure mode consistency interval respectively, and accelerates the damage to the maximum creep load state in the failure mode consistency interval according to the damage equivalence principle, and finally realizes the equivalent acceleration of the creep load. . The invention can convert the creep load with the same failure mode to a larger creep load state according to the principle of damage equivalence, and greatly save the creep test time on the premise that the failure mode is consistent.

Description

technical field [0001] The invention relates to a creep load equivalent acceleration method, in particular to a creep load equivalent acceleration method based on consistent failure modes. Background technique [0002] Engineering structures such as aero-engines and gas turbines work in high temperature and high stress environments for a long time, and their power states are often in the process of constant changes. However, engineering structures often have a life span of thousands or even tens of thousands of hours. If the creep load under actual working conditions is used to test its life and reliability, there are disadvantages of long test time and high cost. On the premise of the same mode, the equivalent acceleration of the creep load is carried out to shorten the test time, that is, the small creep load is accelerated to the large creep load state based on the failure mode consistency and the damage equivalent principle. However, the current creep load equivalent ac...

AI Technical Summary

Problems solved by technology

[0002] Aeroengines, gas turbines and other engineering structures work in high temperature and high stress environments for a long time, and their power states are often in a process of constant change. They are inevitably subjected to variable temperature and load creep loads, which eventually lead to failure.

However, engineering structures often have a life span of thousands or even tens of thousands of hours. If the creep load under actual working conditions is used to test its life and reliability, there are disadvantages such as long test time and high cost. Therefore, it is necessary to ensure Under the premise of consistent mode, the equivalent acceleration of creep load is carried out to shorten the test time, that is, the small creep load is accelerated to the large creep load state based on the principle of consistent failure mode and damage equivalent

However, the current equivalent acceleration method for creep load does not consider the principle of failure mode consistency, and the accuracy of the equivalent acceleration method for damage is low, resulting in a large deviation between the test results and the actual engineering application life.

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