Young's elastic modulus tester with vernier depth gauge

Abstract

The invention relates to a Young's elastic modulus tester with a vernier depth gauge. In the existing Young's elastic modulus instrument for measuring a steel wire by a pulling method, an original optical lever system is cancelled, and the steel wire and a main scale of the vernier depth gauge are fixed together by a dual-purpose movable clamping head. An auxiliary scale of the vernier depth gauge is fixed on a workbench, the upper end of the steel wire is fixed on an upper beam of a frame of the Young's elastic modulus tester, while the lower end is connected with a hook tray, wherein weights can be increased and reduced on the hook tray so as to change pulling force. A testing person increases and reduces the weights to change the pulling force, and the steel wire is stretched along with the changed pulling force; readings on the vernier depth gauge are changed, and a difference value of the readings is the stretching quantity of the steel wire, thus a small variable quantity of the steel wire length being difficult to measure in a process of measuring a Young's elastic modulus by a stretching method is accurately measured through the vernier depth gauge. Other physical quantities required by calculating the Young's elastic modulus can be measured according to a conventional method.

Description

[0001] Field [0002] The invention relates to a device for measuring Young's modulus of elasticity by tensile method. Background technique [0003] Young's modulus of elasticity is a very important material property. It is an important classical physical experiment to measure the Young's modulus of elasticity of steel wire by stretching method. Because the Young's modulus of elasticity of steel wire is very large, so the steel wire within the elastic range The expansion and contraction of the steel wire is very small, and it is difficult to measure it with general methods and length measuring tools. Now the optical lever is generally used to amplify the small expansion and contraction of the steel wire, so as to measure the Young's elastic modulus of the steel wire, and the Young's elastic modulus is measured by the optical lever stretching method. During the debugging process, it is necessary to roughly adjust the optical axis of the telescope to align with the scale image i...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of complex operation and low measurement accuracy in the process of measuring steel wire Young's elastic modulus by the optical lever stretching method, the present invention designs a vernier depth gauge Young's elastic modulus measuring instrument, which abandons the optical lever system, Directly use the vernier depth gauge to measure the expansion and contraction of the steel wire during the stretching process, which greatly simplifies the operation process. Because the vernier depth gauge can measure the length value above 0.02mm, the test accuracy of the instrument of the present invention is better than that of the optical lever with scale. Young's modulus of elasticity measured by tensile method is much higher

[0005] The technical scheme of the present invention to solve the problems of complex operation and low measurement accuracy of the steel wire Young's elastic modulus measuring instrument by the optical lever stretching method is to cancel the original optical lever in the existing stretching method measuring steel wire Young's elastic modulus instrument In the system, a dual-purpose collet is used to fix the steel wire and the main scale of the vernier depth gauge together, the auxiliary scale of the vernier depth gauge is fixed on the workbench, and the upper end of the steel wire is fixed on the upper beam of the Young's modulus of elasticity tester frame. The lower end is connected with a hook tray, on which weights can be added or subtracted to change the pulling force, and the tester can change the pulling force by adding or subtracting weights, and the steel wire will expand and contract accordingly, driving the dual-purpose movable chuck to move, and the dual-purpose movable chuck is equipped with a vernier When the main ruler of the depth gauge moves, the reading on the vernier depth gauge changes accordingly, and the difference is the expansion and contraction of the steel wire. In this way, the small change in the length of the steel wire that is difficult to measure in the process of measuring Young's elastic modulus by the tensile method is passed through the cursor. Depth gauge is accurate

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