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Fatigue life assessment method for mechanical parts

A technology for mechanical parts and fatigue life, which is used in the testing of mechanical parts, the testing of machine/structural parts, and special data processing applications, and can solve problems such as difficulties in three-dimensional stress-strain fatigue life

Active Publication Date: 2016-11-23
AECC COMML AIRCRAFT ENGINE CO LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

At present, it is very difficult to evaluate the fatigue life of mechanical parts under the conditions of three-dimensional stress and strain, variable amplitude load, and variable temperature and high temperature in engineering.

Method used

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  • Fatigue life assessment method for mechanical parts
  • Fatigue life assessment method for mechanical parts
  • Fatigue life assessment method for mechanical parts

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with specific embodiment and accompanying drawing, set forth more details in the following description so as to fully understand the present invention, but the present invention can obviously be implemented in many other ways different from this description, Those skilled in the art can make similar promotions and deductions based on actual application situations without violating the connotation of the present invention, so the content of this specific embodiment should not limit the protection scope of the present invention.

[0050] Such as figure 1As shown, the fatigue life evaluation method of mechanical parts includes obtaining load history data, which can be obtained by measuring the load size of the fatigue part of the mechanical parts through sensors, and then inputting the measured data into the computing device, the mechanical parts The position of the fatigued part can be obtained through e...

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Abstract

The invention aims to provide a fatigue life assessment method for mechanical parts. The fatigue life assessment method comprises the steps that load history data are acquired; load histories of the load history data are repeatedly counted; a critical plane and damage parameters of the critical plane are determined on the basis of a critical plane method; each load history is repeatedly counted, if the maximum temperature T of each load history is lower than the creep originating temperature, the fatigue damage Df1 is assessed, and if the maximum temperature T reaches the creep originating temperature, the fatigue damage Df2 is assessed and the creep damage Dc is assessed; the total damage is assessed according to the formula that D is equal to the sum of sigma Df1, sigma Df2 and sigma Dc; and the fatigue life is assessed according to the total damage.

Description

technical field [0001] The invention relates to a method for evaluating the fatigue life of mechanical components. Background technique [0002] Aeroengine hot-end components such as turbine blades and tongues and grooves often serve under harsh working conditions of high temperature and high stress, and due to the complexity of structural form and loading conditions, the stress-strain state is often in a three-dimensional amplitude-changing multi-axis state. Its high-temperature, three-dimensional multi-axial fatigue life assessment has become an important work in the design stage of these components. These components have significant demands on reliability, lightweight design. High temperature components often have drastic operating temperatures as well. At present, it is very difficult to evaluate the fatigue life of mechanical parts under the conditions of three-dimensional stress and strain, variable amplitude load, and variable temperature and high temperature in engi...

Claims

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Application Information

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IPC IPC(8): G01M13/00G06F19/00
Inventor 张成成任远高靖云李颖方磊
Owner AECC COMML AIRCRAFT ENGINE CO LTD
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