Improved method for testing tensile strength of material by bending test

A technique of tensile strength and bending test, which is applied in the direction of testing the strength of materials by applying a stable bending force, which can solve the difficulty of testing the tensile modulus of elasticity. quantity etc.

Inactive Publication Date: 2013-03-27
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0006] However, the author does not describe the method for measuring the ratio m, nor does it describe the measurement of the tensile modulus of elasticity, E t method, and for so

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  • Improved method for testing tensile strength of material by bending test
  • Improved method for testing tensile strength of material by bending test
  • Improved method for testing tensile strength of material by bending test

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Embodiment 1 4

[0027] Embodiment 1 four-point bending test measures tensile strength

[0028] The material is processed into a rectangular parallelepiped sample, and the size of the rectangular parallelepiped meets the requirements of a slender beam, that is, the width of the sample is smaller than the height, and the ratio of the fulcrum span to the height is not less than 5. Pure bending loading is achieved using a four-point bending method. The two supporting points are arranged horizontally, and they are equidistant from the geometric center of the beam. The two loading points are also arranged horizontally, and the distance from them to the geometric center of the beam is equal, then the bending moment on any cross-section of the sample between the two loading points is a constant value, that is, the beam between the two loading points is a purely curved beam. Measure the strain value of the upper and lower surfaces of the pure bending section during the loading process by the resista...

Embodiment 2 3

[0029] Embodiment 2 three-point bending test measures tensile strength

[0030] The material is processed into a rectangular parallelepiped sample, and the size of the rectangular parallelepiped meets the requirements of a slender beam, that is, the width of the sample is smaller than the height, and the ratio of the fulcrum span to the height is not less than 5. The three-point bending method is used to achieve transverse bending loading. Assume that the two fulcrums are arranged horizontally, and their distances from the geometric center of the beam are equal. The geometric center of the imposed load spans the beam and is perpendicular to the horizontal axis of the beam. Choose a cross-section in the bending section of the beam, arrange measuring points on the upper and lower edges of the cross-section, and test the strain in the axial direction of the beam. Load the sample, the load gradually increases from 0 to the sample failure, record the load P, and the strain value ...

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Abstract

The invention provides an improved method for testing tensile strength of a material by a bending test, which particularly relates to an improved method for testing tensile strength of a material by a pure bending test or a transverse bending test. The conventional tensile strength calculation formula has the problem that a tension-compression elastic modular ratio of the material is inconveniently measured. Aiming at the problem, the improved method takes a strain ratio of corresponding positions on the upper surface and the lower surface of a beam to express tension-compression elastic modulus, thus obtaining an improvement on the method for testing the tensile strength of the material. The improved method comprises the following steps of: loading a beam test sample with a rectangular cross section; recording loads born by the test sample; and measuring axial strain values epsilon c and epsilon t in any position on the upper surface and the lower surface of a pure bending section or axial strain values epsilon c and epsilon t on the upper edge and the lower edge of any cross section of a transverse bending section when the test sample is subjected to linear elastic deformation. A calculation formula of the tensile strength Rt of the material can be derived from a theory of mechanics, and in the calculation formula, M is a maximum bending moment to the test sample which is subjected to critical failure; and b and h respectively are width and height of the cross section of the test sample. The improved method provided by the invention has the advantages of accurate principle, concise calculation formula and easiness of parameter measurement, and can be used for accurately measuring the tensile strength of the material.

Description

technical field [0001] The invention relates to an improved method for testing the tensile strength of materials, that is, a bending test is used to test the tensile strength of materials. Background technique [0002] Tensile strength or tensile strength is one of the basic mechanical parameters of materials, and it is very important to accurately test the tensile strength of materials. Since it is difficult to directly measure the tensile strength and tensile elastic modulus of some materials (such as brittle materials) through uniaxial tensile tests, people generally use indirect methods to measure them. The bend test is an indirect method of testing the tensile strength of a material. Jing Laiwang published the paper "The Influence of Different Tension and Compression Elastic Constants on the Bending Strength of Beams" (hereinafter referred to as Document 1) in the "Journal of Xi'an Institute of Science and Technology" No. 3, 2001, which introduced the use of pure bendi...

Claims

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Application Information

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IPC IPC(8): G01N3/20
Inventor 喻勇
Owner SOUTHWEST JIAOTONG UNIV
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