Simplified method for forecasting fatigue expansion service life of inclined crack in center of rectangular plate

A technology for crack fatigue growth and life prediction, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of conservative accuracy, complex crack analysis and calculation complexity, etc., and achieve the effect of reducing workload

Inactive Publication Date: 2013-04-03
BEIHANG UNIV
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Problems solved by technology

[0005] The precise analysis and calculation of composite cracks is often very complicated. According to the projection method in (References: Xing Wenzhen, Liu

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  • Simplified method for forecasting fatigue expansion service life of inclined crack in center of rectangular plate
  • Simplified method for forecasting fatigue expansion service life of inclined crack in center of rectangular plate
  • Simplified method for forecasting fatigue expansion service life of inclined crack in center of rectangular plate

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Embodiment Construction

[0035] See Figure 4 , a simplified method for life prediction of oblique crack fatigue growth in the center of a rectangular plate of the present invention is realized by writing subroutines of each step in the Python language, and the specific steps of the method are as follows:

[0036] Step 1: Parametric modeling: Establish a finite element model of a rectangular plate with a central oblique crack. Such as figure 2 As shown, first call the create model subroutine to create a rectangular model with a width of 2W, a height of 2H, and the center at the origin of the coordinates; then call the define crack subroutine, define the length as 2a, and the angle b with the x-axis, at the center of the rectangular model crack, (first calculate the coordinates x of two points on the edge of the crack 1 = a cosb,y 1 =a sinb,x 2 =-a cosb,y 2 =-a sinb, connecting two points into a crack).

[0037] Step 2: Mesh division: Due to the existence of cracks, the grid near the crack tip ne...

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Abstract

A simplified method for forecasting the fatigue expansion service life of an inclined crack in the center of a rectangular plate mainly comprises five steps: step I, parametric modeling; step II, meshing; step III, finite element calculation and result reduction; step IV, automatic crack expansion simulation through cycle call; and step V, crack expansion service life forecasting. The method is based on Python language, carries out ABAQUS secondary development, adopts parametric modeling, and compiles command stream software packages for modeling and analysis, can realize automatic simulation of crack expansion of the rectangular plate with the central inclined crack, is low in workload, and high in precision.

Description

technical field [0001] The invention belongs to the technical field of structure, strength and related technologies, and in particular relates to a simplified method for predicting the fatigue growth life of oblique cracks in the center of a rectangular plate. Background technique [0002] Traditional fatigue crack growth analysis usually assumes that the crack type is a pure type I crack. During the crack growth process, the crack growth direction does not change. The empirical relationship between the stress intensity factor and the crack size can be established in advance to simplify the crack growth analysis. calculate. However, in engineering practice, complex cracks are a common form, and the analysis is much more complicated. First, the crack growth rate model is more complex, involving multiple types of crack front parameters. Secondly, the propagation direction of the composite crack is unknown in advance and changes continuously during the propagation process, so...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 齐红宇石浩韩文成
Owner BEIHANG UNIV
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