Device and method for positioning and marking strain gauges

Abstract

The invention relates to a positioning marking device for a strain gage and a method. The positioning marking device comprises positioning mechanisms, a marking mechanism and an operation platform; two sets of positioning mechanisms are respectively arranged at the two ends of a sample; each positioning mechanism comprises a T-shaped slot, a positioning platform, a T-shaped block, a gear, racks and a limiting frame; the T-shaped slot is formed on the operation platform; the positioning platform has an I-shaped structure; racks are fixed on the two sides of the positioning platform and are symmetrically arranged along the T-shaped slot; the T-shaped block is fixedly connected with the gear; the gear is meshed with the racks; the T-shaped slot is matched with the T-shaped block; the positioning platform is hinged with the limiting frame through a hinge. The positioning marking device for the strain gage has the advantages of reasonable structure, convenience in assembling and positioningaccuracy; the positioning marking device can be utilized to mark the outline and cross curve of the strain gage and mark the longitudinal center line and cross curve; the positioning marking device is capable of accurately marking the longitudinal center line of the sample and guaranteeing that the grid wires of the strain gage are symmetrically distributed in a sticking area and parallel to thestretching direction.

Description

technical field [0001] The invention belongs to the technical field of material dynamic testing, and in particular relates to a strain gauge positioning marking device and method for high-speed tensile testing. Background technique [0002] In the prior art, high-speed tensile curves have been more and more used in the simulation analysis of automobile crash simulation. In order to improve the quality of the high-speed tensile curve test and thus improve the reliability of the simulation results, it is necessary to paste high-performance strain gauges on the surface of the sample before the test. Existing test results show that sticking biaxial strain gauges to measure dynamic loads in the purely elastic deformation zone between the clamping section and the arc section can effectively reduce the load oscillation in a wide range of strain rates; The uniaxial strain gauge is attached to the fracture area to obtain accurate micro-area strain. Using these two kinds of data can...

AI Technical Summary

Problems solved by technology

Among the existing installation methods of strain gauges, the authorized announcement number CN 205260517 U discloses a strain gauge positioning and sticking device, which is only suitable for the sticking of strain gauges, although it better solves the problems of poor quality and low precision of manual sticking of strain gauges , is not mentioned and cannot be used for anchor tags before pasting

However, using the traditional vernier caliper or steel ruler plus marking pen marking method, since the length of the strain gauge grid wire used in the dynamic test is only a few millimeters, the length of the reference point on the strain gauge is less than 1 mm, the relative position of the vernier caliper or steel ruler and the sample It cannot be precisely controlled, so it is impossible to accurately mark the line, and it is impossible to ensure that the marking positions of different samples are completely consistent. Obviously, it is not suitable for dynamic testing that requires high-precision positioning.

Existing automatic or semi-automatic scribing devices either destroy the surface of the sample, for example: Chinese patent application number 201510360049.2 discloses a scribing method and a scribing device, and the authorized announcement number CN205466141 discloses a fully automatic gauge distance marking device. Line instrument, or unable to mark strain gauge contour lines and cross lines, for example: Chinese patent authorization announcement number CN 204976607U, a FRP compression sample strain gauge pasting marking device

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