A Fatigue Damage Calculation Method for Welded Steel Structures
A technology of fatigue damage and calculation method, which is applied in the testing of machine/structural components, testing of mechanical components, instruments, etc., and can solve the problems that it is difficult to reflect the characteristics of nonlinear accumulation of fatigue damage
Active Publication Date: 2019-05-14
JINLING INST OF TECH
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However, the above-mentioned methods all take into account the fatigue performance changes within the extreme stress range, and it is difficult to reflect the characteristics of nonlinear accumulation of fatigue damage, and there are certain deficiencies in the accurate assessment of fatigue damage of welded steel structures
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[0067] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.
[0068] see Figure 1 to Figure 4 , the fatigue damage calculation method of a kind of welded steel structure provided by the invention, this method comprises the following steps:
[0069] S1: Establish a full-space curve model of fatigue resistance of welding details;
[0070] S2: Calculate the real time-history stress of the wel...
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The invention provides a welded steel structure fatigue damage calculating method. The method comprises the following steps: establishing a whole space curve model of welding detail fatigue resistance; calculating real time-history stress of a welding detail structure according to welding residual stress at the welding detail place and welding detail structure time-history stress under the vehicle loading effect; carrying out processing on the real time-history stress by utilizing a rain-flow counting method, and calculating equivalent stress amplitude and total stress cycle number according to the processing result; calculating the fatigue life corresponding to the equivalent stress amplitude by utilizing the established whole space curve model; and calculating the fatigue damage of a welded steel structure according to the calculated fatigue life and the total stress cycle number. The provided welded steel structure fatigue damage calculating method can accurately calculate the fatigue damage under different loads and welding residual stress.
Description
technical field [0001] The present application relates to a fatigue damage calculation method, in particular to a fatigue damage calculation method of a welded steel structure. Background technique [0002] Steel structures are widely used in infrastructure projects due to their high strength and lightweight properties. However, steel structures, especially welded steel structures, are prone to fatigue cracks and even fractures under reciprocating loads such as vehicles, wind, and earthquakes, which seriously affect the service performance of steel structures and the safety of engineering structures. Therefore, carrying out reasonable and accurate fatigue damage calculation plays an important role in improving the performance evaluation level of welded steel structures, improving the efficiency of operation and maintenance and management and maintenance of engineering structures, and ensuring the service safety of engineering structures. [0003] The fatigue damage calculat...
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IPC IPC(8): G01M13/00G01N3/32
CPCG01M13/00G01N3/32
Inventor 宋永生丁幼亮李爱群
Owner JINLING INST OF TECH