Method for measuring internal stress-strain field of hydrogel soft material
An internal stress, hydrogel technology, applied in computer material science, special data processing applications, constraint-based CAD, etc., to achieve stable and accurate output results and low economic costs.
Pending Publication Date: 2022-05-31
NANJING UNIV OF SCI & TECH
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[0004] The object of the present invention is to provide a method for measuring the internal stress-strain field of hydrogel soft materials, which solves the difficult problem of measuring the internal stress-strain field of hydrogel soft materials
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[0026] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.
[0027] like figure 1 As shown, a research method for measuring the internal stress-strain field of a hydrogel soft material when contact deformation occurs, including:
[0028] Step 1: Prepare hydrogel cylindrical specimens for uniaxial compression experiments, as figure 2 As shown, the diameter of the sample is 20mm and the height is 20mm;
[0029] Step 2: Carry out the uniaxial compression experiment of the hydrogel soft material, the schematic diagram of the experiment is as follows image 3 shown. The nominal stress and nominal strain data of the hydrogel sample are obtained through experiments, and the nominal stress σ is defined as:
[0030]
[0031] where F is the external force, A 0 is the initial cross-sectional area of the force-bearing surface of the specimen. The nominal strain ε is defined as:
[0032]
[0033] whe...
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Abstract
The invention discloses a method for measuring an internal stress-strain field of a hydrogel soft material, which comprises the following steps: firstly, preparing a hydrogel cylindrical sample for a uniaxial compression experiment, carrying out the uniaxial compression experiment of the hydrogel soft material, and obtaining nominal stress and nominal strain data of the hydrogel sample; a polynomial second-order strain potential energy function in a hyperelastic material model is selected through finite element software to fit stress-strain of a hydrogel sample, parameters of the polynomial second-order strain potential energy function are obtained, hydrogel material parameters are set in ABAQUS finite element software, numerical simulation calculation of the hydrogel contact behavior is conducted, and the hydrogel contact behavior is obtained. And obtaining stress and strain data of the hydrogel soft material. The internal stress-strain field of the hydrogel soft material during contact deformation is measured by using a method combining experiments and numerical calculation, and the problem that the internal stress-strain field during hydrogel deformation is difficult to measure in the experiments is effectively solved.
Description
technical field [0001] The invention belongs to the field of measuring contact deformation of hydrogel soft materials, in particular to a method for measuring the internal stress-strain field of hydrogel soft materials when contact deformation occurs. Background technique [0002] Hydrogel refers to a class of three-dimensional polymer network soft materials containing a large amount of water inside, which are widely used in soft robots, human biomedicine, and sensing and detection. However, hydrogels often face various contact deformation problems in the application of various fields. It is very important to detect the stress-strain field of hydrogel contact deformation to deal with its contact problems. Although DIC (Digital Speckle Technology) technology can be used to measure the strain field on the surface of hydrogel soft materials, it is not enough to only know the strain field on the outer surface of the hydrogel contact deformation problem. Due to the geometric irr...
Claims
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IPC IPC(8): G16C60/00G06F30/23G06F111/04G06F111/10G06F119/14
CPCG16C60/00G06F30/23G06F2111/04G06F2111/10G06F2119/14Y02T90/00
Inventor 沈煜年覃宗喜
Owner NANJING UNIV OF SCI & TECH