Sheet metal bidirectional stretching apparatus based on die technology

Abstract

The invention discloses a sheet metal bidirectional stretching apparatus based on a die technology. The sheet metal bidirectional stretching apparatus comprises a work bench, a camera, a cross test piece, four groups of stretching mechanisms containing tension sensors, a top board, four groups of seat-type guiding mechanisms and a computer control system; by applying downward driving force to the top board, the top board performs downward movement through the four groups of seat-type guiding mechanisms, and drives the four groups of stretching mechanisms to outwardly move on a cross chute, so that the four groups of stretching mechanisms can form stretching structures in four directions to the cross test piece; a deformation signal and a pulling force signal of the cross test piece can be respectively obtained through the camera and the tension sensors by the computer control system, and strain and stress of the cross test piece can be calculated. By realizing simultaneous loading with different proportions, practicality of stress and strain of the bidirectional tensile test materials can be developed.

Description

technical field [0001] The invention relates to the technical field of material performance detection technology and equipment, in particular to a bidirectional tensile test device. Background technique [0002] Since the plate and shell theory was established, plate and shell structures have been used in more and more fields. Many scientists in the world have devoted themselves to the study of two-way force-bearing structures, such as space containers in aviation and aerospace. The calculations are quite complicated, so many parties are looking for "Two-way test method". However, this problem has not been well solved so far. A large part of the reason is the complexity of the design of the double pull device. Scholars have studied different types of biaxial tensile test methods in different periods, such as double tensile test under uniaxial tension, film swelling double tensile test, pressure vessel double tensile test, cross-shaped specimen double tensile test, etc. Be...

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Problems solved by technology

This method is the choice of most researchers, but this type of device has a complex structure, the test load that can be carried out is small, and it is easy to cause damage to the test device during the fatigue test

[0007] The second type mainly uses independent drive systems for bidirectional tensile tests, which can achieve different strain states under different loading ratios. However, this type of device has a complex structure, high cost, and poor synchronization control, which limits the application of this method. application

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