Creep Load Acceleration via Consistent Failure Mode
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Solution Overview
Problem
Current creep load equivalent acceleration methods do not follow the principle of consistent failure mode, resulting in low accuracy and significant deviations in test results for the service life and reliability of engineering structures like aeroengines and gas turbines, which are subjected to high temperatures and variable loads.
Innovation Solution
An equivalent acceleration method for creep loads based on consistent failure mode, involving high-temperature tensile and creep tests to establish rupture time, minimum creep rate, and rupture strain laws, followed by a multi-grade variable temperature and variable load creep nonlinear damage accumulation model to calculate damage tolerance factors and accelerate creep loads to a maximum state with uniform damage interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the current creep load equivalent acceleration method is used, then the test time is reduced, but the accuracy of test results deteriorates due to inconsistent failure modes
Solution Approach 1:
The patent transforms the creep load acceleration problem by changing the parameter representation from stress-based to damage-based. By introducing damage tolerance factor and using damage equivalence principle, the method maintains consistent failure modes while achieving time reduction. The damage accumulation model transforms physical parameters into a unified damage metric that preserves failure mode consistency across different load levels.
Solution Approach 2:
The patent introduces damage tolerance factor as an intermediary parameter that bridges the gap between different creep load conditions. This intermediary concept allows transformation of complex multi-parameter creep problems into a simplified damage equivalence framework, enabling accurate acceleration while maintaining failure mode consistency through the mediating role of damage parameters.
2Loss of time
If the damage equivalent acceleration method is used, then the test time is shortened, but the reliability of test results deteriorates due to large deviations from actual engineering application
Solution Approach 1:
The patent fundamentally changes the parameter framework by transitioning from stress-based acceleration parameters to damage-based parameters. This parameter transformation ensures that the accelerated test results remain reliable for actual engineering applications by using damage equivalence rather than simple stress equivalence, thereby maintaining the physical meaning and reliability of test results.
Solution Approach 2:
The patent replaces the traditional mechanical stress-based acceleration approach with a damage-based equivalence system. By substituting the mechanical parameter framework with a damage parameter framework, the method achieves both time reduction and reliability preservation, as damage parameters directly reflect the physical degradation process that determines component life and reliability.
3Reliability
If traditional creep load testing is performed under actual working conditions, then the reliability of service life assessment is improved, but the test time increases significantly to thousands or tens of thousands of hours
Solution Approach 1:
The patent changes the testing parameters by introducing damage tolerance factor and using damage equivalence principles. This parameter transformation enables the creation of accelerated test conditions that maintain the same damage accumulation rate as actual service conditions, thereby achieving reliable service life assessment in significantly reduced test times through non-linear damage acceleration.
Solution Approach 2:
The patent applies preliminary damage characterization through high-temperature tensile and creep tests to establish damage tolerance factors and rupture laws before conducting accelerated testing. This preliminary action creates a foundation of material-specific damage parameters that enable accurate acceleration while maintaining reliability, avoiding the need for extremely long conventional tests.
Data Source
AI summary
Disclosed is an equivalent acceleration method of creep loads based on a consistent failure mode. The equivalent acceleration method includes obtaining corresponding tensile strengths; obtaining corresponding creep rupture time; establishing rupture time law, minimum creep rate law and rupture strain law; calculating the value of parameter p in creep damage accumulation model; and dividing the failure mode consistency interval of creep load under variable temperature and variable load. The damage caused by the creep load in the failure mode consistency interval is calculated by using the multi-grade variable temperature and variable load creep nonlinear damage accumulation model, the damage is accelerated to the maximum creep load state in the failure mode consistency interval according to the principle of damage equivalence, and finally the equivalent acceleration of creep load is realized.