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Method for predicting creep-fatigue service life of aluminum alloy piston of high-power diesel engine

A high-power diesel engine, fatigue life prediction technology, applied in the direction of testing the ductility of materials, testing the strength of materials by applying repetitive force/pulsation force, etc., can solve the problems that the practical significance is not obvious, and the damage cannot be fully considered, so as to solve the problem of non-destructive The effect of linear coupling

Inactive Publication Date: 2013-10-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, this definition of fatigue load ignores the influence of long-term continuous and variable working conditions of high-power diesel engines.
For the structure of high-speed and high-power diesel engines, the practical significance of evaluating the fatigue life by explosive cycles is not obvious, and the use of start-stop cycles to study the fatigue life cannot fully consider the continuous working process and load cycle changes of high-power diesel engines. the damage caused

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  • Method for predicting creep-fatigue service life of aluminum alloy piston of high-power diesel engine
  • Method for predicting creep-fatigue service life of aluminum alloy piston of high-power diesel engine
  • Method for predicting creep-fatigue service life of aluminum alloy piston of high-power diesel engine

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Embodiment Construction

[0045] In order to better illustrate the purpose and advantages of the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] Due to the long-term and variable working conditions of the vehicle diesel engine, the structural parts of the combustion chamber are subjected to thermal and mechanical loads that change with the engine's working conditions. To predict the creep-fatigue life under this cyclic load feature, the fatigue cycle must first be determined. load. The fatigue cycle load form of the defined high-power diesel engine under changing operating conditions is as follows: figure 2 As shown, the horizontal axis is time, and the vertical axis is temperature and cyclic mechanical stress, respectively.

[0047] The creep damage evolution equation of the material under the above fatigue load characteristics can be expressed as:

[0048] dD ...

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Abstract

The invention relates to a method for predicting the creep-fatigue service life of an aluminum alloy piston of a high-power diesel engine, belonging to the field of material science and engineering application technologyies. The influences of large-range and periodic working condition change of the high-power diesel engine on the fatigue service life of the piston structure are taken into account in the method, a new fatigue period is defined to predict the service life of the piston; considering that the engine works under a long-time variable working condition, and the non-linear coupling action between the creep damage and the fatigue damage generated inside a material can be effectively overcome through a creep-fatigue service life prediction model which is built on the basis of damage mechanics.

Description

technical field [0001] The invention relates to a creep-fatigue life prediction method for an aluminum alloy piston of a high-power diesel engine, and belongs to the technical field of material science and engineering application. Background technique [0002] At present, due to the demand for energy, efficiency and high power ratio, high-speed, heavy-duty and high-power diesel engines have been developed rapidly. The gas temperature and maximum explosion pressure in the cylinder of this new type of high-power diesel engine are constantly increasing. The high-power diesel engine combustion chamber structure piston has been subjected to a maximum temperature of about 400°C, and an explosion pressure of more than 20MPa. [0003] During the normal working process of a high-power diesel engine, the piston structure is subjected to cyclic mechanical and thermal loads. Under long-term continuous working conditions, the piston structure often suffers sudden fatigue damage. Especia...

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Application Information

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IPC IPC(8): G01N3/28G01N3/32
Inventor 刘金祥左正兴张庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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