Cross double pull comprehensive test platform and method suitable for high temperature conditions

Abstract

The present disclosure provides a comprehensive test platform and method suitable for cross double pull under high temperature conditions, including an electric heating temperature control system, a stretch control system and a strain measurement system, and the stretch control system includes a testing machine and a two-way cross stretch device , scale grating and force sensor, the testing machine is connected with a two-way cross tension device, and pressure is applied to it, and the two-way cross tension device is used to clamp and stretch the scale grating of the test piece and the force sensor is used to read the The tensile length and force value of the test piece; the electric heating temperature control system makes the ambient temperature of the stretching control system reach the set value; the strain measurement system includes an interconnected measuring head and a processor, and the measuring head includes a A camera for the image of the stretching process, the processor obtains the strain value of the specimen during the stretching test at a set temperature according to the image. The disclosure can accurately test the mechanical properties and forming properties of materials under double-drawing at high temperature and different loading ratios.

Description

technical field [0001] The disclosure belongs to the field of characterization testing of mechanical properties and formability of metal sheets, and in particular relates to a cross-double pull comprehensive testing platform and method suitable for high temperature conditions. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Cross double drawing can obtain the mechanical properties, yield criterion and forming limit of the plate under equal double drawing and different strain paths, and the mechanical properties of the plate under equal double drawing and different strain paths, yield criterion and forming limit at different temperatures It is particularly important to guide the sheet forming process. [0004] The inventor has developed a two-way cross tensile test device (application number 201710187880.1) before that, which solves the p...

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Problems solved by technology

[0004] The inventor has developed a two-way cross tensile test device (application number 201710187880.1) before that, which solves the problem that the stretching ratio of the existing mechanical stretching device is limited and cannot fully test the mechanical properties of the material under different stretches. It provides certain help for tensile tests at different temperatures, but, as far as the inventor knows, the current platforms that can perform bidirectional cross tensile performance tests on metals at different temperatures are generally made of hydraulic or mechanical two-way stretchers. The device and the heating furnace are combined. When performing tensile tests at different temperatures in the heating furnace, due to the high temperature air in the closed furnace body, the refraction of light by the glass, etc., the non-contact strain measurement technology (that is, DIC technology) ) cannot be applied well, which affects the test accuracy, and thus cannot obtain accurate mechanical properties and formability of the sheet, and cannot provide an accurate data basis for sheet forming

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