Bearing-type damage biomechanic three-point bending test device and bearing-type damage biomechanic three-point bending method

Abstract

The invention provides a bearing-type damage biomechanic three-point bending test device. The bearing-type damage biomechanic three-point bending test device is characterized by comprising a base (1), a support base (2), support bearings (3), support shafts (4), a pressing head (5), a sensor (6), a connecting plate (7), a travel switch (8), a baffle (9), a baffle fixing screw (10), a support base fixing screw (11) and a dividing rule (12). The bearing-type damage biomechanic three-point bending test device provided by the invention has the advantages that a pair of support shafts and the support bearings can support a biological sample, the rolling friction is formed among the support shafts and the support base, the biological sample free bending constraint caused by the friction in a test process is reduced, the transformation of the biological sample on a supporting position is relieved, more accurate test data can be obtained, and a terminal condition more easily set in a finite element model so as to perform material parameter reverse engineering.

Description

technical field [0001] The invention mainly relates to an injury biomechanics test device, in particular to a bearing type injury biomechanics three-point bending test device. Background technique [0002] Obtaining the mechanical properties and material parameters of biological tissues is of great value for studying artificial tissues, anthropomorphic substitutes or developing finite element models. In order to obtain the mechanical properties of human or animal tissue materials, one of the commonly used methods is to conduct a three-point bending test on the sample, and then calculate the material parameters by means of the material parameter inverse method. [0003] Biomechanical test is a kind of mechanical test carried out on biological tissue. Compared with conventional mechanical materials, the particularity of biological tissues determines that biomechanical tests are also different from conventional mechanical material tests, specifically reflected in the following...

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN202903617U and the patent name "In-Situ Three-Point Bending Test Device" uses a relatively novel method to accurately measure the quasi-static mechanical properties of samples at the micro-nano scale, but it is not suitable for dynamic tests on samples and cannot be used Measuring the mechanical response of biological samples under different strain rates

[0010] The publication number is CN102607834A, and the Chinese patent titled "a fatigue test device for synchronous loading of structural specimens in three directions" can be loaded in three directions at the same time for fatigue tests. However, the clamping of the samples before the experiment It is more complicated, the required test preparation is relatively long, and it does not meet the requirements of convenient sample clamping and high test efficiency required for damage biomechanics tests

[0011] The publication number is CN203083889U, and the name of the invention is "Invention patent of corrosion fatigue three-point bending crack growth test device. It has a simple structure and is easy to process and manufacture, but it is inconvenient to fix and load the center. It is cumbersome to place the sample during the test, and it is not suitable for dynamic impact. test, not suitable for biomechanical tests

[0012] The publication number is CN202814781U, and the invention patent titled "A Three-Point Bending Test Device for Wire Rods" can center and fix wires with small diameters for three-point bending tests. The deformation resistance of the sample is relatively large, so it is not suitable for the test of biological tissue materials with soft texture

[0013] The publication number is CN102183408A, and the Chinese patent titled "Three-point or Four-point Bending Fatigue Test Fixture for Living Rat Ulna" can use live rats for testing, with clear focus points and precise positioning, but the clamping and positioning are troublesome and require a lot of work. Sample testing is not efficient

At the same time, the supporting ends of the devices involved in this patent are fixed and cannot be rotated. During the test, there is sliding friction between the sample and the supporting ends. Inverse calculation of material parameters of meta-model

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