Four-point bending elastic parameter measuring method and four-point bending elastic parameter measuring system

A four-point bending, elastic parameter technology, applied in the direction of using a stable bending force to test the strength of materials, can solve the problems that the displacement measurement direction of the displacement sensor is difficult to achieve a coplanar state, and the measurement accuracy is low, and achieves light weight and measurement. The effect of high precision and low screw drive precision requirements

Inactive Publication Date: 2014-04-02
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Due to the influence of the structural size of the sensor, it is difficult for the displacement measuremen

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  • Four-point bending elastic parameter measuring method and four-point bending elastic parameter measuring system
  • Four-point bending elastic parameter measuring method and four-point bending elastic parameter measuring system
  • Four-point bending elastic parameter measuring method and four-point bending elastic parameter measuring system

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] like figure 1 As shown, the four-point bending principle of a rectangular cross-section beam.

[0032] The bending force F passes through the movable fulcrum S 1 and S 2 Acting on the upper side of the beam, fixed fulcrum S 3 and S 4 acting on the underside of the beam, S 3 and S 4 The reaction force and the movable fulcrum S 1 and S 2 The force causes the beam to bend and deform. Fixed fulcrum S 3 and S 4 The section between them only bears the action of pure bending moment, the part above the neutral layer of the beam is in a pure tension state, and the part below the neutral layer is in a pure compression state. According to the Euler-Bernoulli beam theory, the theoretical value of the stress at the position of the strain gauge is shown in formula (1), and according to Hooke's law, the stress-strain relationship is shown in formula (2). ...

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Abstract

The invention discloses a four-point bending elastic parameter measuring method and a four-point bending elastic parameter measuring system, belonging to the field of elastic parameter measurement, and solving the problems in the prior art. The four-point bending elastic parameter measuring method provided by the invention comprises the steps that an ideal uniaxial drawing (or compression) stress state is formed in a testing region by utilizing a four-point bending principle of a rectangular section beam, a determined theory relation exists among the stress value, a sample structure size and an applied load value, the strain value of a measuring point in axial and horizontal mutual orthogonal directions can be obtained by utilizing a strain paster measuring method, and further an elastic modulus and a poisson ratio of the sample can be calculated. The four-point bending elastic parameter measuring system comprises a testing loading device, a load data collecting unit, a strain data collecting unit and a data processing unit. The method provided by the invention has the advantages that the principle is simple, the test precision is high, the application range is wide, the realization is easy, the development cost is low, and the measuring system is miniaturized, desk type and manual operation equipment and has large popularizing capacity.

Description

technical field [0001] The invention belongs to the field of elastic parameter measurement, in particular to a method and system for measuring elastic parameters (including elastic modulus and Poisson's ratio) of solid materials. The method can not only be used for the measurement of elastic modulus and Poisson's ratio of metal materials, It has unique advantages in solving the elastic modulus measurement of hard and brittle materials such as glass and ceramics. Background technique [0002] Elastic modulus and Poisson's ratio are very important mechanical performance parameters of solid materials, which play an important role in evaluating the stiffness and deformation resistance of structures. The current measurement methods for elastic modulus of solid materials mainly include uniaxial tensile test method, modal parameter identification method, ultrasonic sound velocity measurement method, etc. Among them, the uniaxial tensile test method is the most widely used measurem...

Claims

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Application Information

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IPC IPC(8): G01N3/20
Inventor 李海星徐钰蕾沈宏海黄猛姚园张宇鹏
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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