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A method and system for measuring residual stress on material surface

A technology of residual stress and measurement system, applied in the direction of force/torque/work measuring instrument, measuring device, instrument, etc., can solve the problems of high test environment and test cost, unsuitable measurement, etc.

Inactive Publication Date: 2018-06-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional indentation test method is based on a nano-indenter, which has high requirements on the test environment and test cost, and requires a large amount of data for empirical formula fitting, so it is not suitable for measurement in actual situations

Method used

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  • A method and system for measuring residual stress on material surface
  • A method and system for measuring residual stress on material surface
  • A method and system for measuring residual stress on material surface

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Embodiment Construction

[0047] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0048] Such as figure 1 As shown, the measurement system of the material surface residual stress of the present embodiment includes: a residual stress detector 1, an impedance analyzer 2, a strain gauge 3 and a computer control system 4; wherein, as figure 2 As shown, the residual stress detector includes a support ring 11, a height-adjustable support 16, a piezoelectric beam 12, a piezoelectric sheet 13, a press-in needle tip 14, and a strain gauge 15; the bottom of the support ring 11 is provided with three centrally distributed The height-adjustable support 16 adjusts the height of the support ring; the support ring 11 is internally provided with three piezoelectric beams 12 symmetrically distributed in the center, and one end of each piezoelectric beam 12 is fixed on the support ring 11, and the other end is connected with other The ...

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Abstract

The invention discloses a method for measuring material surface residual stress and a system thereof. The method comprises following steps: a press-in needle tip is contacted with a region to be measured of a sample to be measured, and the sample to be measured is pressed in continuously; a strain gauge measures the changes of load F through strain signals output by a strain foil; an impedance analyzer measures electromechanical impedance frequency response of piezoelectric patches of piezoelectric beams; a projection area S of the contact area of the press-in needle tip and the samples to be measured through the electromechanical impedance frequency response; an F-S curve of the press-in process can be obtained through continuously pressing in and then residual stress is obtained. The measurement method is convenient and efficient; material properties such as plasticity and yield stress, etc. are not needed to be known in advance; the method provided by the invention is an on-site measurement method which is suitable for on-site measurement and engineering field measurement, and can be extended to an automation measurement system. The method only requires a strain measuring module and an impedance chip module and therefore, the method is suitable for large-scale measurement.

Description

technical field [0001] The invention belongs to the field of detection and measurement, and in particular relates to a method and system for measuring residual stress on a material surface. Background technique [0002] Residual stress is usually produced in processes such as machining, non-uniform heating and chemical corrosion. It widely exists in important parts such as nuclear power materials, aircraft landing gears that withstand repeated impacts, and functional coatings on the surface of space shuttles. Residual stress has a significant impact on the fracture toughness, fatigue strength and service life of materials. Accurate characterization of the residual stress of materials is of great significance for measuring structural damage and accurately evaluating the performance and service life of structures. [0003] The causes of residual stress are extremely complex, and it is difficult to predict them using theoretical models. In practice, experimental methods are oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 李法新付际夏荣煜
Owner PEKING UNIV
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