Device for detecting residual stress close to surfaces of metal materials

A technology of residual stress and metal materials, applied in the direction of measuring devices, measuring forces, instruments, etc., can solve the problems of human radiation, inability to realize on-site testing, and many interference factors, etc., and achieve the effect of simplicity and intuition

Inactive Publication Date: 2013-04-03
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF4 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the surface must be polished before testing, which will undoubtedly generate residual stress, and the strain gauges are cumbersome to paste, which cannot achieve real-time testing
The X-ray diffraction method is mainly used in non-destructive testing. Although this method has been marketed, it

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
  • Device for detecting residual stress close to surfaces of metal materials
  • Device for detecting residual stress close to surfaces of metal materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The specific embodiment of the present invention is described in detail below:

[0011] The near-surface residual stress detection device for metal materials includes two main parts, hardware and software, and auxiliary devices. like figure 1 As shown, the device of the present invention uses a computer as a platform, and mainly includes several parts such as excitation and receiving probes, ultrasonic transmitting cards, data acquisition cards, computer systems, and transmission lines. When the temperature difference is large, it will cause thermal expansion and contraction deformation of the plexiglass and the fixing plate. The temperature acquisition card is installed, and the software collects the external temperature in real time, and removes the influence of temperature changes on the deformation and sound velocity of the mechanical parts of the system, so that the system can adapt to testing under complex environmental conditions and has a wider range of applica...

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 relates to a device for detecting residual stress close to surfaces of metal materials. The device stimulates a critical-refraction longitudinal wave and calculates a stress value according to an acoustic elasticity theory. According to the invention, by reducing contact area between a wedge and a part to be measured, the affect of plate surface distortion to a measurement result can be effectively eliminated; the affect caused by temperature difference can be eliminated by temperature compensation; and therefore, the system is adaptable to tests in more terrible field environments. The system is higher in integration degree, small and exquisite in appearance and convenient to carry.

Description

1. Technical field [0001] The invention designs a near-surface residual stress detection device for steel metal materials. Using ultrasonic longitudinal waves, the detection of residual stress near the surface of metal components can be realized. 2. Background technology [0002] The existing residual stress measurement techniques mainly include pinhole method and X-ray diffraction method. The small hole method has higher measurement accuracy, but this is based on the premise of damaging the surface state of the material. In this method, the surface must be polished before testing, which will undoubtedly produce residual stress, and the strain gauges are cumbersome to paste, which cannot achieve real-time testing. The X-ray diffraction method is mainly used in non-destructive testing. Although this method has been marketed, it has radiation to the human body, and the test time is long, so it cannot be tested on-site. [0003] Although a lot of research has been done on th...

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): G01L1/25
Inventor 徐春广杨向臣潘勤学肖定国徐浪李骁宋文涛郭军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap