Material mechanical property testing method under three-dimensional stress state

Abstract

The invention provides a material mechanical property testing method under a three-dimensional stress state, relating to a material mechanical property testing method. When common liquid is used as a force transfer medium to apply normal pressure, a high pressure can hardly be provided and dynamic seal and other bottleneck problems can be caused during a plate stretching process; and the problems can be solved through adoption of the method provided by the invention. The method provided by the invention comprises a left die cavity, a right die cavity, an S pole, an N pole, a high-pressure oil pipe, a hydraulic control system, magnetic particles, base liquid and a magnetic control unit; a magnetic medium is used as an intelligent material and has directional arrangement under the action of a controllable magnetic field so as to apply normal pressure to a plate, and the size of the normal pressure can be changed through the regulation on the magnetic field, so as to test the one-way stretch forming property of the plate under the actions of different normal forces; compared with the common liquid, the magnetic medium can realize sealing more easily; therefore, a technical means is provided for testing the high-pressure forming property of plate (tube) fluid. The method requires simple equipment and few test steps, has high controllability and can be easily implemented, popularized and applied to production.

Description

technical field

[0001] The invention relates to a method for testing the mechanical properties of a material, in particular to a method for testing the mechanical properties of a plate under a three-dimensional stress state. Background technique

[0002] With the increasing demand for energy saving and emission reduction, the application of lightweight materials such as aluminum alloys, magnesium alloys and titanium alloys is increasing. In the fields of aerospace and automobile, in addition to using lightweight materials to reduce weight, lightweight structure is another major way to reduce weight. For structures that mainly bear bending and torsional loads, the use of hollow variable-section members can simultaneously achieve the dual effects of weight reduction and full use of material strength. Internal high pressure forming is an advanced manufacturing technology of hollow variable cross-section lightweight components developed in response to this demand. The process p...

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