Visual tensile testing system

Abstract

The invention discloses a visual tensile testing system, which belongs to the field of mechanical analysis and test on metallic materials. The visual tensile testing system comprises a loading mechanism, a control mechanism, a signal acquisition and measurement mechanism, a visual acquisition mechanism and a data processing mechanism. The visual tensile testing system is characterized in that: the loading mechanism is mechanically connected to the interior of a host frame of a tester by a clamp and a clamping block; the control mechanism is arranged in a host base frame of the tester by a card; the signal acquisition and measurement mechanism is arranged in a slot of a host control card by the card; the visual acquisition mechanism consists of a CCD image acquisition system, an acquisition card, image analysis processing software, an automatic scaling frame and a communication unit; the data processing mechanism comprises a computer and an industrial personal computer; and the industrial personal computer is connected with a host control mechanism by a standard RS232 communication line. In the visual tensile testing system, the tester is utilized to perform dynamic loading on a tensile test specimen, the visual acquisition system acquires the deformation of the test specimen in a scale distance, a strength value channel acquires a strength value, a displacement channel acquires displacement, and the data processing system finishes data processing and performs analysis on tensile mechanical performance to obtain accurate and complete results.

Description

technical field [0001] The invention belongs to the field of testing and analyzing mechanical properties of materials, and in particular provides a visual tensile test system, which is suitable for testing and analyzing the tensile properties of inorganic materials such as metals and plastics. Background technique [0002] Tensile test is a basic method for testing the mechanical properties of materials, and plays an important role in the safety assessment of metal parts in service. where the non-proportional elongation strength R p0.2 , strain hardening exponent n, plastic strain ratio r, etc. are very important parameters in the design, and these parameters need to be determined according to the force-deformation characteristics of the sample during the stretching process. The determination of the force value is relatively easy to realize, and has high real-time and accuracy. For a long time, the measurement of deformation has mostly been measured by contact extensometer...

AI Technical Summary

Problems solved by technology

[0003] ①Due to the influence of the stiffness of the extensometer itself, the measured data has a certain hysteresis

[0004] ②Due to the weight of the extensometer itself, ultra-thin and ultra-fine samples cannot be measured

[0005] ③Due to structural limitations, it is not suitable for small gauge length and super brittle samples

[0007] ⑤ For the nr test that needs to measure axial and transverse deformation at the same time, it is very troublesome to install two axial and transverse extensometers, and only one point of deformation can be obtained in the transverse direction, which does not meet the requirements of the test method

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