A method for testing residual stress distribution on bone surface
A technology for residual stress and distribution testing, applied to force/torque/power measuring instruments, measuring devices, instruments, etc., can solve problems affecting the accuracy of experiments and achieve accurate measurement results
Active Publication Date: 2019-05-03
象山欧迅船舶设备有限公司
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But studies have shown that both radiation dose and water content in the sample can affect the experimental precision of this method
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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0040] The present invention proposes a method for testing the distribution of residual stress on the bone surface, such as figure 1 As shown, it includes the following six steps:
[0041] Step 1: Establish the relationship between stress and strain
[0042] Assuming that the residual stress is uniformly distributed in the z direction, the relationship between residual stress and strain is generally expressed as
[0043]
[0044] In the formula, ε(a i ) is the groove depth is a i The strain value measured when the function G(x,a i ) gives the groove depth at a i The strain response to unit stress at depth x at time .
[0045] Step 2: Establish the relationship between stress and depth
[0046] The relationship between residual stress and depth can be approximated as
[0047]
[0048] In the formula, A j is the coefficient to be sought, U j (x) is the u...
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The invention discloses a method for testing the surface residual stress distribution of a bone. The method comprises the following steps that 1, a relation between the stress and the strain at different depths of the bone is established; 2, the relation between the stress and the depth of the bone is established; 3, the unknown quantity to be measured by an experiment in the end is eliminated through equation transformation, a flexibility coefficient is introduced, the relation of the strain, the flexibility coefficient and the coefficient to be solved is established, and the flexibility coefficient is calculated through a finite element model; 4, the strain value is measured through the improved experiment; 5, the transverse and longitudinal elasticity modulus of the anisotropic materialof the bone is measured through the experiment; and 6, the coefficient to be solved is solved through the solved flexibility coefficient and the strain measured through the experiment, and thereforethe relation between the surface residual stress and the depth of the bone is finally obtained. The novel method for testing the surface residual stress distribution of the bone has the beneficial effects that by means of a creative experiment means and a modeling combination mode, the residual stress distribution near the surface of the bone can be accurately measured.
Description
【Technical field】 [0001] The invention belongs to the field of bio-experimental mechanics, and in particular relates to a method for testing the distribution of residual stress on a bone surface. 【Background technique】 [0002] In human tissues and organs, residual stress is ubiquitous and plays a very important role. Tissues and organs will generate corresponding residual stress during their growth, remodeling and morphological changes. In turn, these residual stresses will play a very important role in the growth, remodeling and morphological changes of tissues and organs. Likewise, residual stress plays a vital role in the growth, shaping and daily repair of bone structures. The research on the distribution of residual stress on the bone surface is very important for the study of the growth and reconstruction mechanism of bone tissue, for the treatment of corresponding orthopedic diseases, and for the development of bionic bone structures. However, due to the lack of e...
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IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 张勇波王俊玲崔轶黄裕梁王治华傅惠民
Owner 象山欧迅船舶设备有限公司