Method for testing lap joint fracture resistance of bamboo skin rolls

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...

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 fracture resistance of different lapping methods is different. Therefore, the existing The test method for the mechanical properties of lap joint samples cannot fully and accurately reflect the fracture resistance of bamboo composite pressure pipes.

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