Biological bone small-dimensional sample three-point bending test device

Abstract

The invention relates to a bone small-dimensional sample three-point bending test device, wherein a support seat guide rail groove (21) is processed in a base (1); support seats (2) and a center block (3) are arranged on the support seat guide rail groove (21); a threaded hole is processed in a lug boss arranged on the support seat guide rail groove (21) of the base (1); kidney-shaped holes used for locking and fixation are processed in the two sides of the support seats (2) and the center block (3); after the centering test on the center block (3), the center block (3) is fixed on the base (1) through tightly screwing center block fastening screws (11); the support seats (2) realize the axial line distance regulation of two rolling shafts (6) through the regulating the sliding of direct advancing type electronic micrometer heads (4) along the support seat guide rail groove (21) of the base (1). The mutual position between the support seats (2) is regulated by the direct advancing type electronic micrometer heads (4); good adaptability is realized by three-point bending tests of various kinds of small-dimension bone samples in a certain range.

Description

technical field [0001] The invention mainly relates to a damage biomechanics test device, in particular to a three-point bending test device for a small-sized biological bone sample. Background technique [0002] Three-point bending test is one of the commonly used test methods to study the mechanical properties of biological tissue materials. At present, in the field of biomechanics, pig bones, bovine bones, or sheep bones are mostly used to prepare biological bone samples, and the sample size is generally small, especially in terms of thickness. The accuracy of three-point bending test data of bone samples is easily affected by the test device itself. Therefore, it is necessary to develop a three-point bending test device for small-sized bone samples to provide more accurate test data for injury biomechanics research and promote the development of this field. [0003] The particularity of skeletal biological hard tissue determines that the three-point bending test device...

AI Technical Summary

Problems solved by technology

The publication number is CN 102183408A, and the Chinese patent titled "Living Rat Ulna Three-Point or Four-Point Bending Fatigue Test Fixture" uses live rats for the test. The focus point is clear and the positioning is precise, but the support end of the sample involved in this patent is fixed. , during the test process, there is sliding friction between the sample and the support end, and the friction force is large, which will inevitably have a certain impact on the accuracy of the test results, and the clamping and positioning of the fixture is troublesome, and the efficiency of a large number of sample tests is not high

[0008] The publication number is CN 104007010A, and the Chinese patent titled "a horizontal impact injury biomechanics dynamic three-point bending test device" provides a horizontal impact injury biomechanics dynamic three-point bending test device, which can reduce the support of biological samples. The impact of constraints such as end friction on test results, but this patent is mainly for large bone samples, and it is not suitable for three-point bending tests of small bone samples

[0009] The publication number is CN 103760037A, and the Chinese patent titled "A Bearing-type Injury Biomechanics Three-Point Bending Test Device and Test Method" uses a pair of support shafts and support bearings to support biological samples, reducing friction during the test Constraints on the free bending of biological samples, but the central loading of the samples during the test is mainly based on visual inspection, and the movement of the two support ends and the sample stopper is relatively cumbersome, which reduces the accuracy and reliability of the test results

[0010] The publication number is CN 105300810A, and the Chinese patent titled "A Three-Point Bending Test Device with a Laser Alignment Device" uses the beam of a cross-line laser for alignment, which reduces the influence of human subjective factors on alignment, but the The patent is mainly aimed at the fatigue fracture test of metal materials, and is not applicable to the three-point bending test of small-sized bone samples

Images