System and method for testing tensile property of soft hydrophilic material in normal saline

Abstract

The invention relates to a system for testing the tensile property of a soft hydrophilic material in normal saline. The system comprises a microcomputer-controlled universal tensile testing machine (1), a salt bath box (2A), a temperature-controlled circulating water tank (2B), a salt bath system (2), a clamping device (3) and a digital image acquisition system (4). The invention further discloses a method for testing the elasticity modulus, the Poisson's ratio and the elongation at break of the soft hydrophilic material in the normal saline environment through the system. The device and the method are high in controllability, convenient to operate and easy to popularize.

Description

technical field [0001] The present invention relates to the field of experimental mechanics of soft hydrophilic materials, more specifically, to a system and method for testing the tensile properties of soft hydrophilic materials in physiological saline, especially for the elastic modulus of soft medical materials , Poisson's ratio, elongation at break testing system and method. Background technique [0002] Soft hydrophilic materials have broad application prospects in the biomedical field. After the soft hydrophilic material absorbs water and swells in water, it is transparent, soft, elastic, and not easy to break when bent. This kind of material has little mechanical stimulation in the body tissue, and is a kind of biomedical material with great application value. [0003] In order to promote the realization of various functions of soft hydrophilic materials in medical devices, it is necessary to measure the elastic modulus, Poisson's ratio and elongation at break of so...

AI Technical Summary

Problems solved by technology

The elongation at break of soft hydrophilic materials is relatively large, but the size of the clamps used in conventional plastic films or flexible foam materials is too large, which cannot meet the loading stroke, resulting in the elastic modulus of soft hydrophilic materials , Poisson's ratio and elongation at break have become difficult

The particularity of soft hydrophilic materials and the normal saline environment make conventional contact extensometers unusable. A new clamping device is required to cooperate with a non-contact strain measurement device to form a dedicated test system to solve the problem of soft hydrophilic materials. Difficulties in loading and measuring in saline and the need for corresponding test methods

[0005] In view of the above existing problems, the present invention provides a system for testing the tensile properties of soft hydrophilic materials in physiological saline and a corresponding testing method, which solves the difficulties in loading and measuring soft hydrophilic materials in physiological saline , can reliably test the tensile properties of soft hydrophilic materials, improving the accuracy of tensile properties of soft hydrophilic materials in saline

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