Material mechanical property testing method under three-dimensional stress state

A technology of material mechanics and testing methods, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problem of sheet forming performance that ordinary liquids are not easy to seal, and achieve the effect of increasing yield strength, increasing elongation, and fewer processes

Active Publication Date: 2012-08-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems that it is difficult to evaluate the formability of the plate under the complex stress state (that is, the three-dimensional stress state) in the existing uniaxial tensile test, and the ordinary liquid is not easy to seal when the pressure is too high. Experimental method for normal pressurization of ordinary liquids in the process of uniaxial stretching of sheets

Method used

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  • Material mechanical property testing method under three-dimensional stress state
  • Material mechanical property testing method under three-dimensional stress state
  • Material mechanical property testing method under three-dimensional stress state

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specific Embodiment approach 1

[0016] Specific implementation mode one: the following combination figure 1 , figure 2 , image 3 , Figure 5 , Figure 6 and Figure 7 Specifically illustrate the present embodiment, the method for testing the mechanical properties of materials under the three-dimensional stress state includes the following steps: one, manufacturing the left mold cavity 9 and the right mold cavity 2 of the combined mold cavity; two, processing the plate sample 1 Place and fix in the middle of the left mold cavity 9 and the right mold cavity 2; 3. Fix the upper and lower ends of the plate sample 1 on the fixture of the material mechanical performance testing machine respectively; 4. Mix a certain proportion of magnetic particles 6 and base liquid 7 And fully stirred to make a magnetic medium (magnetorheological fluid); five, inject the magnetic medium into the gap between the plate sample 1 and the left mold cavity 9 and the right mold cavity 2; six, pass the hydraulic control system 5 th...

specific Embodiment approach 2

[0018] Specific implementation mode two: the following combination figure 1 , figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 This embodiment will be specifically described. The difference between this embodiment and the first embodiment is that the plate sample 1 is rectangular, and the other components and connections are the same as those of the first embodiment.

specific Embodiment approach 3

[0019] Specific implementation mode three: the following combination figure 1 , figure 2Specifically explaining this embodiment, the test device includes a right mold cavity 2, an S pole 3, a high pressure oil pipe 4, a hydraulic control system 5, magnetic particles 6, a base liquid 7, an N pole 8, a left mold cavity 9 and a magnetic control unit 10 , the left mold cavity 9 and the right mold cavity 2 are combined and circumferentially fixed to form a combined mold cavity, and the magnetic medium composed of magnetic particles 6 and base liquid 7 fills the gap in the middle of the combined mold cavity, and the oil on the combined mold cavity The hole communicates with the hydraulic control system 5 through the high-pressure oil pipe 4; the hydraulic control system 5 pressurizes the cavity formed by the left mold cavity 9 and the right mold cavity 2 through the high-pressure oil pipe 4; the N pole 8 and the S pole 3 are arranged oppositely and respectively Be fixed on the out...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
Inventor 苑世剑李峰
Owner HARBIN INST OF TECH
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