Double-cross composite fabric membrane biaxial tensile strength test piece and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11598702-B2
Application number	US-201816617062-A
Country	US
Kind code	B2
Filing date	May 23, 2018
Priority date	May 26, 2017
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A double-cross composite fabric membrane biaxial tensile strength test piece is provided, including a core region and four cantilevers. The four cantilevers extend outwards around the core region and form a cross shape. Each cantilever is connected to the core region via an edge transition region. An end portion of the cantilever is a clamping section. The clamping section is provided with a clamping end rubber rod. The clamping end rubber rod is used for connecting to a clamp of a biaxial tensile testing machine. The clamping section is three-layered. The cantilever and the edge transition region are double-layered. The core region is single-layered. The edge transition region is in the shape of a quadrangle rounded at four corners. A manufacturing method of the test piece is also provided.

First claim

The invention claimed is:

1. A double-cross composite fabric membrane biaxial tensile strength test piece, comprising a core region and four cantilevers,
wherein the four cantilevers extend outwards around the core region and form a cross shape, each cantilever is connected to the core region via an edge transition region, and an end portion of the cantilever is a clamping section provided with a clamping end rubber rod, which is used for connecting to a clamp of a biaxial tensile testing machine; the double-cross composite fabric membrane biaxial tensile strength test piece is configured such that during a biaxial tensile strength test, the cantilever transfers a tensile force from the biaxial testing machine to the transition region, the tensile force is eventually applied to the core region, which is a biaxial tensile test core region, and tensile damage first occurs in the core region; and
wherein the clamping section is three-layered, the cantilever and the edge transition region are double-layered, the core region is single-layered, and the edge transition region is in the shape of a quadrangle rounded at four corners;
wherein the cantilever comprises a first layer and a second layer, the length of the second layer is greater than that of the first layer, the second layer is folded upward to overlap an end portion of the first layer, so that the clamping section has three layers, and the clamping end rubber rod is wrapped in the three layers of the clamping section.

2. The double-cross composite fabric membrane biaxial tensile strength test piece according to claim 1 , wherein a rounded corner is formed between two adjacent cantilevers, and a region in which the rounded corner is located between the two adjacent cantilevers is double-layered.

3. The double-cross composite fabric membrane biaxial tensile strength test piece according to claim 1 , wherein the first layer and the second layer are welded or adhesively bonded together.

4. The double-cross composite fabric membrane biaxial tensile strength test piece according to claim 1 , wherein the cantilever is provided with a plurality of slits, which are parallel to the length direction of the cantilever.

5. The double-cross composite fabric membrane biaxial tensile strength test piece according to claim 1 , wherein the material of the double-cross composite fabric membrane biaxial tensile strength test piece is a fabric membrane, and the length direction of the cantilever is parallel to the warp or weft direction of the fabric membrane.

6. A manufacturing method of a double-cross composite fabric membrane biaxial tensile strength test piece comprising the following steps:
step 1: choosing a non-defective region on a fabric membrane that is at least 10 cm away from a width edge and a roll end edge, to cut a first cut sheet and a second cut sheet having an orthogonal cross shape, wherein each of the first cut sheet and the second cut sheet comprises four arms, the four arms of each cut sheet form the orthogonal cross shape, the arms of the first cut sheet are longer than the arms of the second cut sheet, and a square hole rounded at four corners is provided at the center of the second cut sheet; each arm is furthermore parallel to the warp or weft direction of the fabric membrane of the cut sheet in which the arm is located; and during cutting, a rounded corner is formed between two adjacent arms in each cut sheet;
step 2: placing the second cut sheet on the first cut sheet, aligning the center and the four arms of the second cut sheet with the center and the four arms of the first cut sheet respectively, uniformly applying mutually soluble adhesives to an overlap surface of the first cut sheet and an overlap surface of the second cut sheet, then overlapping and adhesively bonding the first cut sheet and the second cut sheet, uniformly compressing the first cut sheet and the second cut sheet, and then placing the first cut sheet and the second cut sheet in a dry environment until the mutually soluble adhesives are cured, so that the first cut sheet and the second cut sheet are completely adhesively bonded together to obtain four cantilevers, wherein the overlap surfaces are weldable surfaces or glueable surfaces;
step 3: making a part of the arm of the first cut sheet that is beyond the arm of the second cut sheet and located at an end portion of the cantilever wrap a clamping end rubber rod, then applying mutually soluble adhesives, and then performing folding, overlapping, and gluing to obtain a clamping section of the cantilever; and
step 4: manufacturing a plurality of slits in each cantilever, with the slits being parallel to the length direction of the cantilever.

7. The manufacturing method according to claim 6 , wherein in step 2, after the second cut sheet is placed on the first cut sheet, a core region is formed at a central region of the first cut sheet, and the core region is used as a core test region of the test piece and is single-layered; an edge transition region is formed around the core region and is double-layered; the square hole at the center of the second cut sheet provides a quadrangle rounded at four corners at a connection between the edge transition region and the core region; and the cantilever is also double-layered.

8. The manufacturing method according to claim 7 , wherein two ends of the slit are respectively approximately 2 cm away from the clamping section and the connection between the edge transition region and the cantilever.

9. The manufacturing method according to claim 6 , wherein in step 3, after the part of the arm of the first cut sheet that is beyond the arm of the second cut sheet and located at the end portion of the cantilever is folded, the clamping section is three-layered.

Assignees

• Univ Shanghai Jiaotong

Inventors

• Chen Wujun
• Gao Chengjun
• Shi Taibai
• Wang Pingan
• Wang Mei

Classifications

• G01N2203/0282

  Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes · CPC title

• G01N3/08 Primary

  by applying steady tensile or compressive forces (G01N3/28 takes precedence) · CPC title

• G01N2203/0429

  using adhesive bond; Gluing · CPC title

• G01N2203/0254

  Biaxial, the forces being applied along two normal axes of the specimen · CPC title

• G01N1/286

  involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising (microtomes G01N1/06; pulverising in general B02C; mixing in general B01F) · CPC title