Tester for measuring real stress-strain curve of plate material under unidirectional compression state

A technology of unidirectional compression and true stress, which is applied in the direction of measuring devices, testing the ductility of materials, analyzing materials, etc., can solve the problems that cannot truly reflect the mechanical properties of the sheet metal, and it is difficult to eliminate the friction of the end surface, so as to achieve good lubrication and contact small area effect

Inactive Publication Date: 2013-08-28
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] In order to overcome the disadvantages existing in the prior art that it is difficult to effectively eliminate the end surface friction force and cannot truly reflect the mechanical properties of the sheet metal under unidirectional compression, the present invention proposes a method for measuring the true stress-strain of the sheet material under the unidirectional compression state. curve test device

Method used

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  • Tester for measuring real stress-strain curve of plate material under unidirectional compression state
  • Tester for measuring real stress-strain curve of plate material under unidirectional compression state
  • Tester for measuring real stress-strain curve of plate material under unidirectional compression state

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Embodiment Construction

[0020] This example includes the upper mold base 2, the lower mold base 10, the upper insert 6, the lower insert 9, the upper punch 7, the lower punch 8, the guide post 4, the guide sleeve 3, the positioning block 5, the measuring frame 1 and the extension Count 18.

[0021] Adopt symmetrical guide post mold base, and A-type guide post guide sleeve, as shown in the drawings figure 1 Shown.

[0022] A guide sleeve 3 is provided at each end of the lower surface of the upper mold base 2, and a guide post 4 is provided at each end of the upper surface of the lower mold base 10, and the guide post 4 and the guide sleeve 3 are nested with each other After sliding connection, a space is formed between the lower surface of the upper mold base 2 and the upper surface of the lower mold base 10. The base of the upper punch 7 is located at the center of the lower surface of the upper die base 2; the upper surface of the base of the upper punch 7 is attached to the lower surface of the upper d...

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Abstract

The invention discloses a tester for measuring a real stress-strain curve of a plate material under a unidirectional compression state. The lower surface of an upper die seat is attached to the upper surface of an upper puncher pin base; the upper surface of a lower die seat is attached to the lower surface of a lower puncher pin base; an upper insert is fixed on the lower surface of the upper die seat and used for fixedly connecting an upper puncher pin with the upper die seat; the lower puncher pin base is positioned in the center of the upper surface of the lower die seat; a lower insert is opposite to the upper insert; a measurement frame is positioned at the same end of the tester; and a measurement rod of the measurement frame is in sliding fit with the inner hole of an upper strut.A plate material test piece is arranged horizontally, so that the plate material test piece cannot be unstably bent during compression, and large-extent compression deformation is realized; and therefore, the real stress-strain curve of the plate material under a large deformation extent is obtained.

Description

Technical field [0001] The invention relates to the field of cold working, in particular to a test device for measuring the true stress-strain curve of a sheet in a unidirectional compression state based on a rolling test. technical background [0002] Establishing an accurate constitutive equation is an important prerequisite for solving the problem of metal plastic forming, and the constitutive equation can be established through unidirectional uniform tensile, compression or pure shear tests. According to different plastic deformation states, different test methods are selected. At present, to study the mechanical properties of sheet metal under compression, domestic and foreign scholars mostly adopt the metal sheet compression test method similar to the national standard GB / T7314-2005, that is, the sheet metal specimen is placed vertically, the bottom end of the long axis is fixed and the upper end Under compression, both ends of the short shaft are free and unconstrained. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/28G01N3/02
Inventor 杨合宋飞飞李智军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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