Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for predicting residual stress intensity factors of CT sample preloading

A residual stress and intensity factor technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of difficult and conservative stress intensity factor calculation

Pending Publication Date: 2019-01-22
TIANJIN UNIV
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing methods all calculate the stress intensity factor under the main load case
For specimens containing residual stress, the calculation of the stress intensity factor is particularly difficult
Generally, scholars are accustomed to calculate the stress intensity factor by taking the average value of the residual stress field near the crack tip, but this method will greatly conservatively estimate the actual stress intensity factor near the crack tip containing residual stress

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for predicting residual stress intensity factors of CT sample preloading
  • A method for predicting residual stress intensity factors of CT sample preloading
  • A method for predicting residual stress intensity factors of CT sample preloading

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] S1: Create as figure 1 In the model shown, first, the upper round pin 1 and the lower round pin 8 are used to compress and load the CT sample body 2 with a predetermined size, and then the upper round pin 1 and the lower round pin 8 are released, and the gap between the CT sample body 2 and A certain residual stress distribution is generated near 5;

[0025] S2: Insert prefabricated cracks 6 at the gaps containing residual stress, and obtain the stress intensity factor through the historical variables in the post-processing;

[0026] S3: The stress intensity factor of the CT specimen with residual stress can be obtained by finite element simulation, the finite element simulat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for predicting residual stress intensity factor of CT sample preloading. The normalized sample thickness, precompression load and prefabricated crack length ratio canbe substituted into the fitted functional relationship to predict the residual stress intensity factor. The invention has the beneficial effect of simplifying the engineering application and can be applied to the prediction process of the incubation period of the structure containing the residual stress.

Description

technical field [0001] The invention relates to the technical field of engineering critical evaluation of stress intensity factors of structures containing residual stress under normal temperature conditions, in particular to a method for predicting preloaded residual stress intensity factors of CT samples. Background technique [0002] The stress intensity factor is the stress intensity or stress state that describes the far-field load or residual stress at the crack tip in fracture mechanics. It is usually found in linear elastic materials or materials that yield in a small range. Its size depends on the sample geometry, size, crack location, and the magnitude and loading method of the load. At present, the engineering calculation method for the common type I crack (opening type) has been formed, and the standard ASTM1457 can be seen. [0003] However, the existing methods are to calculate the stress intensity factor under the main load case. For samples containing resi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 徐连勇邬栋权荆洪阳韩永典赵雷吕小青
Owner TIANJIN UNIV