A biaxial tensile test device with third-direction stress provided by fluid pressure and its application

Abstract

The invention provides a biaxial tensile testing device with thirdly directional stress provided by fluid pressure and application thereof. The biaxial tensile testing device with thirdly directional stress provided by fluid pressure comprises a stretching device, a sealed box, a heating system, a fluid pressure system, a temperature detecting device, a pressure measuring device, a cooling systemand a data collecting and processing device. The biaxial tensile testing device with thirdly directional stress provided by fluid pressure, provided by the invention, can be used for improving a forming limit of a material to some extent by considering the influence of the fluid pressure on a biaxial tensile test, is not only suitable for testing the performance of a constant-temperature material, but also is suitable for testing the performance of a high-temperature material; the heating system is used for carrying out heating and constant-temperature control on a testpiece to be tested and has a high temperature-raising efficiency and a small error; the device also comprises the cooling system which is used for carrying out necessary cooling on a box body in the test process of testing the performance of the high-temperature material so that the service life of the testing device is prolonged, and the efficiency of the testing device is improved.

Description

technical field [0001] The invention belongs to the technical fields of hot medium forming technology and material testing, and in particular relates to a bidirectional tensile test device and its application in which fluid pressure provides third-directional stress. Background technique [0002] Hot medium forming technology is the most innovative plastic forming technology developed rapidly in the early 21st century. Thermal medium forming is a manufacturing method that uses high-temperature thermal fluid medium as the force transmission medium and replaces part of the mold forming parts. Hot medium forming has the dual advantages of thermoforming and fluid forming. With the participation of thickness stress induced by fluid pressure, the plasticity and ductility of the material are significantly improved, the yield strength decreases rapidly, and the tendency to rupture decreases. In view of these advantages, more and more researchers have carried out more in-depth resea...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing biaxial tensile test device that does not consider the influence of the third direction stress, does not have universality for testing normal temperature materials and high temperature materials, and cannot effectively solve the existing technical problems of hot medium forming, the present invention proposes a A kind of fluid pressure provides the bidirectional tensile test device of the third direction stress and its application, introduces the fluid pressure in this bidirectional tensile test device, and the fluid pressure participates in the tensile test of the specimen as the third direction stress, expands the biaxial tensile test Experimental Testing of Material Stress and Strain Availability

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