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Preparation and clamping testing device of variable-thickness hydrogel tensile sample with preset clamping rings

A technique of tensile specimen and clamping ring, which is used in the preparation of test samples, the use of stable tension/pressure to test the strength of materials, and the measurement device, etc., to prevent slippage, avoid stress concentration, and ensure accurate and reliable test results. Effect

Active Publication Date: 2018-06-22
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] In order to solve the problems faced in the hydrogel tensile test, the present invention provides a method for the preparation and clamping test of a dumbbell-shaped hydrogel tensile sample with variable thickness and preset clamping rings

Method used

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  • Preparation and clamping testing device of variable-thickness hydrogel tensile sample with preset clamping rings
  • Preparation and clamping testing device of variable-thickness hydrogel tensile sample with preset clamping rings
  • Preparation and clamping testing device of variable-thickness hydrogel tensile sample with preset clamping rings

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] A preparation and clamping test method of a hydrogel tensile sample with variable thickness and preset clamping rings, comprising the following steps:

[0032] A. Referring to the corresponding national standards or common practices in the industry, first set the cross-sectional size at the gauge length section III of the hydrogel tensile sample 2, including the width w 0 , thickness t 0 (i.e. depth) and length L 0 .

[0033] B. Determine the shape and size of the clamping ring 3 according to the type of fixture of the testing machine. If a wedge-shaped self-locking clamp is used, the clamping ring 3 can be solid or hollow. In this embodiment, solid is used, and its outer diameter D is taken as 2w 0 , thickness t 2 Than t 1 1mm larger. Prepared by 3D printing technology, the material is hard plastic.

[0034] C. According to w 0 , t 0 and L 0 To deter...

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Abstract

The invention discloses a preparation and clamping testing device of a variable-thickness hydrogel tensile sample with preset clamping rings, and belongs to the technical fields of functional polymermaterials and experimental mechanics. The sample is molded through mold casting, wherein a mold is rectangular, the inner cavity is in the shape of a dumbbell and is divided into a clamping section, atransition section and a scale distance section in the length direction, each part meets certain dimension requirements, the three sections are symmetrically distributed by taking the scale distancesection as a center, and the cross section of each section is rectangular; the clamping section and the scale distance section are connected by adopting arc-shaped transition, and are used for avoiding stress concentration. The clamping rings in a pair are prepared, and are placed at the corresponding positions of the clamping sections in advance. Blended hydrogel is poured into a mold cavity, thevariable-thickness hydrogel tensile sample with the clamping rings is obtained after solidification and demolding, and a clamp prepared by a testing machine is used for clamping, so that the operation of a tensile test is carried out. The hydrogel can be effectively prevented from sliding or breaking in the clamping part, and simultaneously, strain measurement is further convenient to perform byadopting an optical stress measurement technology, so that the testing result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials and experimental mechanics, and relates to the mechanical performance test of hydrogel, in particular to a preparation and clamping test method of a hydrogel tensile sample with variable thickness and preset clamping rings. Background technique [0002] Hydrogel is a kind of polymer with a three-dimensional network structure. It can absorb a large amount of water and swell in water. The water content can be as high as 90%wt. However, after swelling, it can still maintain its original structure without being dissolved, making the hydrogel Glue has become the most promising artificial substitute material for biological tissue. In addition, through the precise design of the physicochemical properties and biological properties of the hydrogel, the hydrogel can have biocompatibility, bioadhesion, biodegradability, drug release and controllable mechanical properties, and can be used...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/04G01N1/28
CPCG01N1/28G01N3/04G01N3/08G01N2203/0017G01N2203/04
Inventor 马国军吴承伟丁帅文马建立张伟吕永涛
Owner DALIAN UNIV OF TECH
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