Method for testing lap joint fracture resistance of bamboo skin rolls

A test method, bamboo strip roll technology, applied in the direction of applying stable tension/compression to test material strength, measuring device, strength characteristics, etc., can solve the problem of large impact and cannot fully, accurately and truly reflect the fracture resistance of bamboo composite pressure pipes Performance, fracture resistance and other issues, to achieve high accuracy, simple and fast test method, to ensure the effect of accuracy

Pending Publication Date: 2020-01-21
中林鑫宙竹缠绕发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the bamboo composite pressure pipe uses bamboo as the base material, thermosetting resin as the adhesive, and the winding process is adopted for the pipe, it is greatly affected by the weaving and winding process, and the fractu

Method used

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  • Method for testing lap joint fracture resistance of bamboo skin rolls
  • Method for testing lap joint fracture resistance of bamboo skin rolls

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] First prepare the sample. Cut a sample to be tested with a length of L along the length of the bamboo strip roll to be tested, cut n samples to be tested from N rolls of bamboo strips, and the cut samples to be tested must include the upper roll, the lower roll and the lap surface;

[0035] Preferably (according to the optimal number of samples obtained by multiple tests):

[0036] When 1≤N≤90, n=5;

[0037] 91≤N≤150, n=8;

[0038] When 151≤N≤500, n=13;

[0039] When 501≤N≤1200, n=20;

[0040] When 1201≤N≤3200, n=32;

[0041] When 3201≤N, divide N into 3200x+y (1≤y<3200), n=32X+n' (1≤y≤90, n'=5; 91≤y≤150, n'=8; 151 When ≤y≤500, n'=13; when 501≤y≤1200, n'=20; when 1201≤y≤3200, n'=32)

[0042] Further, it is necessary to ensure that the lap center line of the lap surface is located at the center of the sample to be tested, and the lap line is parallel to the cutting line plane at both ends of the sample. The overlapping line is parallel to the cutting line to ensu...

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Abstract

The invention discloses a method for testing lap joint fracture resistance of bamboo skin rolls. The method comprises the following steps: preparing a sample: cutting at least two to-be-tested samplesfrom a plurality of bamboo skin rolls, wherein the to-be-tested samples comprise an upper roll, a lower roll and a lap joint surface; clamping two ends of each bamboo skin roll to two ends of a clampby taking the lap joint as the center, mounting the bamboo skin rolls on a tensile testing machine after clamping, uniformly and continuously loading the sample until the sample is fractured, and reading and recording the fracture force F during fracture; judging that the lap joint fracture force F of each sample is greater than or equal to Fm or F is less than Fm, recording the number S of the samples with F being less than Fm in the bamboo skin rolls, comparing S with M, judging that the bamboo skin rolls are qualified when S is less than or equal to M, otherwise, judging that the bamboo skin rolls are unqualified, wherein Fm is the minimum value of the set lap joint fracture force, and M is the maximum number of the samples with unqualified performance when the samples are qualified. According to the testing method, the lap joint fracture resistance of the bamboo skin rolls can be accurately and reasonably reflected, and the qualification of the fracture resistance of the bamboo skin rolls can be conveniently screened.

Description

technical field [0001] The invention belongs to the technical field of bamboo strip rolls, and more specifically relates to a method for testing the fracture resistance of lap joints of bamboo strip rolls. Background technique [0002] Bamboo material is a renewable green environmental protection material, and the application of bamboo composite materials is becoming more and more extensive. It can generally replace traditional pipes such as polyvinyl chloride pipes, polyethylene pipes, glass steel pipes, cement pipes, spiral welded pipes, and ductile iron in various occasions, and has a good application prospect. [0003] The bamboo composite pressure pipe is made of overlapping and winding bamboo composite materials. Due to the existence of the overlapping, the performance of the bamboo composite will be affected by the firmness of the bamboo strips. In order to ensure the performance of the bamboo composite pressure pipe in the later application If there is no breakage a...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0067G01N2203/0252G01N2203/0676
Inventor 叶柃张淑娴孙元平翁赟项甜甜
Owner 中林鑫宙竹缠绕发展有限公司
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