Bidirectional shear test device for metal plates

Abstract

The invention discloses a bidirectional shear test device for metal plates, comprising a servo motor, a speed reduction mechanism, a measuring instrument, a tension and compression shearing mechanismand a rotary shearing mechanism, wherein the servo motor supplies power to the whole device to drive the operation of the whole device; the speed reduction mechanism is configured to convert the high-speed motor rotation into low-speed shearing motion; the measuring instrument is configured to measure the force and deformation generated during the test; and the tension and compression shearing mechanism and the rotary shearing mechanism are the actuators of the entire test device in order to achieve shear deformation in both directions of the bidirectional shear test piece. The motor drive canrealize the constant tension, compression shear deformation and rotational shear deformation at any ratio during bidirectional shearing, and improve the reliability of the test results. The forward and reverse shearing of the metal plates can be realized by the forward and reverse rotation of the drive system to obtain a more comprehensive study of material properties.

Description

technical field [0001] The invention belongs to a test device, which is a test device which can be used to measure the shear performance of metal plates, and in particular relates to a two-way shear test device for metal plates. Background technique [0002] In recent years, in order to improve the utilization rate of materials as much as possible and give full play to the properties of materials, some new testing methods of material properties have been gradually adopted by people. The shear test of sheet metal has attracted extensive attention because of its wide range of test strains and the ability to study the behavior of materials with large strains. At present, there are many shear tests on metal plates and test methods including shear, but there are few studies on the properties of plates under bidirectional shear, and different deformation states have a great influence on material properties. [0003] After searching the literature of the prior art, it was found th...

AI Technical Summary

Problems solved by technology

At present, there are many shear tests on metal plates and test methods including shear, but there are few studies on the performance of plates in two-way shear, and different deformation states have a great impact on material properties

[0003] After searching the literature of the prior art, it was found that the Chinese patent with the publication number CN108169036A, the name of the invention: a mechanical two-way shearing device for metal sheets, which can realize two-way shearing of metal sheets, and is used for research on two-way shearing The deformation behavior, but the deformation ratio between the rotary shear and the downward shear described in this device is fixed. If you want to change the deformation ratio, you need to replace different connecting rods, and the size of the connecting rods is proposed Requirements, high cost and very inconvenient

In addition, during the test, the ratio of the two deformation modes is not constant, which will have a certain impact on the test results

At the same time, the inner and outer rings of the test piece are fixed with bolts. When the inner ring is fixed, the bolts of the outer ring are inconvenient to install, and relative sliding is prone to occur.

Due to the self-locking phenomenon of the use of the link mechanism, it will affect the maximum operating displacement during the test, and it cannot be used to study the material properties of the material during cyclic shearing

Images