High-cycle fatigue and low-intensity impact coupled damage calculation method based on nominal stress method

A technology of high cycle fatigue and nominal stress, which is applied in the field of fatigue damage analysis and reliability evaluation, and can solve problems such as product impact damage

Active Publication Date: 2013-10-09
BEIHANG UNIV
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  • Description
  • Claims
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Problems solved by technology

In addition, when the impact stress is greater than the strength of the product, it may directly lead to impact damage of the product

Method used

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  • High-cycle fatigue and low-intensity impact coupled damage calculation method based on nominal stress method
  • High-cycle fatigue and low-intensity impact coupled damage calculation method based on nominal stress method
  • High-cycle fatigue and low-intensity impact coupled damage calculation method based on nominal stress method

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Embodiment Construction

[0161] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0162] The following examples are as follows figure 1 The process shown is carried out, and the case selects an actuator cylinder as the fatigue-shock analysis object, which mainly includes analyzing the characteristics of the impact load, determining its type, analyzing and selecting a suitable fatigue cumulative damage model, and calculating the fatigue cumulative damage after impact , Estimation of fatigue damage probability, establishment of product strength affected by fatigue damage model, establishment of reliability evaluation model. Specific steps are as follows:

[0163] Step 1: Collect product information, determine the fatigue limit of the product, use the Basquin formula to calculate the fatigue life corresponding to the single-stage load only under the action of fatigue load; analyze the fatigue cumulative damage mode, and selec...

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Abstract

The invention relates to a high-cycle fatigue and low-intensity impact coupled damage calculation method based on a nominal stress method. The method comprises the following steps of: 1, determining the initial fatigue limit of a product, and calculating the fatigue life corresponding to single step of load under the action of fatigue load by utilizing the Baskin formula; 2, determining whether random impact or fixed impact exists according the frequency of impact; 3, calculating the accumulated fatigue damage after first 1000 times of impact according to the damage calculation method of the accumulated fatigue damage rule selected in the step 1; 4, calculating the accumulated fatigue damage after more than 1000 times of impact and the total accumulated damage value of the product at the t moment; 5, calculating the probability of no fatigue failure and the probability of random impact failure respectively, thereby finally obtaining the reliability of the product. The method provided by the invention can be used for evaluating the fatigue life and reliability of the product under the complex environment, and then discussing the impact and accumulated fatigue damage models in different cases, and is wide in selection area and application space, simple and convenient in analysis and calculation process and strong in engineering practicability.

Description

technical field [0001] The invention provides a damage calculation method based on a nominal stress method for coupling high-cycle fatigue and low-strength impact, and belongs to the technical field of fatigue damage analysis and reliability evaluation. Background technique [0002] Fatigue damage is one of the important failure modes of mechanical and electromechanical products. Under repeated load cycles, the product will produce fatigue damage. When the damage value reaches a certain threshold, it will lead to fatigue damage. This load is called fatigue load. In addition to fatigue loads, products may also be subjected to impact loads during operation or storage. The impact load may not only directly lead to the failure of the product, but also affect the fatigue damage, and then affect the fatigue life of the entire product. Therefore, in order to evaluate the life and reliability of the product more accurately, it is necessary to analyze the coupling effect between fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
Inventor 陈红霞陈云霞康锐
Owner BEIHANG UNIV
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