Engine cylinder cover creep fatigue analysis method
A technology for engine cylinder head and fatigue analysis, which is used in the analysis of materials, the use of repetitive force/pulsation force to test the strength of materials, measurement devices, etc. It can solve problems such as unpredictable dangerous positions and integrated exhaust port cracking
Active Publication Date: 2020-02-21
CHERY AUTOMOBILE CO LTD
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Problems solved by technology
For the area of the integrated exhaust port that is far away from the combustion chamber and less affected by the explosion pressure, the dangerous position cannot be predicted, and the integrated exhaust port has cracked in some tests
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[0024] The specific embodiment of the present invention will be described in further detail by describing the embodiments below with reference to the accompanying drawings, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and contribute to its implementation.
[0025] Such as figure 1 As shown, the invention provides a kind of engine cylinder head creep fatigue analysis method, comprising:
[0026] S1. Analyze the causes of fatigue cracking in the integrated exhaust duct of the integrated exhaust cylinder head, and determine the typical test conditions;
[0027] S2. Simulate typical test conditions, conduct finite element calculations on the integrated exhaust cylinder head, and clearly consider the necessity of material creep characteristics;
[0028] S3, carry out material creep test, according to creep constitutive equation, obtain the actual creep ...
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The invention discloses an engine cylinder cover creep fatigue analysis method which comprises the following steps: S1, analyzing the cause of fatigue cracking of an integrated exhaust passage of an integrated exhaust cylinder cover, and determining a typical test working condition; S2, simulating a typical test working condition, performing finite element calculation on the integrated exhaust cylinder cover, and clearly considering the necessity of material creep characteristics; S3, performing a material creep test, and obtaining actual creep characteristic parameters of the material according to the creep constitutive equation; S4, establishing a finite element model of the test piece, simulating a creep test on the finite element model, and correcting a creep constitutive equation; S5,performing creep strength analysis, and obtaining stress and strain results of the integrated exhaust cylinder cover; and S6, performing fatigue calculation, and performing benchmarking on the cracking position of the test. According to the creep fatigue analysis method for the engine cylinder cover, the dangerous position where cracks occur in the integrated exhaust passage of the exhaust integrated cylinder cover can be accurately calculated and evaluated.
Description
technical field [0001] The invention belongs to the technical field of engines, in particular, the invention relates to a creep fatigue analysis method of an engine cylinder head. Background technique [0002] Integrated exhaust cylinder head is an important development direction and trend of vehicle engine lightweight and manufacturing technology in recent years. With the implementation of the national four-stage fuel consumption regulations and the national six emission regulations, the pressure on the engine to save energy and reduce emissions is increasing. The integrated exhaust cylinder head technology has an excellent effect on reducing engine cold start emissions, and can effectively improve the high-speed and high-load operation of the engine. The air-fuel ratio of the air conditioner has achieved the comprehensive effect of energy saving and emission reduction. [0003] The existing method of calculating the fatigue strength of the engine cylinder head considers t...
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IPC IPC(8): G06F30/23G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0073G01N2203/0071Y02T90/00
Inventor 李玲娟齐少虎周君徐亚飞张德定
Owner CHERY AUTOMOBILE CO LTD