A method for testing the initial axial tensile strength of bamboo composite pressure pipes
A technology of bamboo composite pressure pipe and axial stretching, applied in the direction of applying stable tension/pressure to test material strength, measuring device, strength characteristics, etc., can solve the problem of not fully reflecting the axial tensile performance of bamboo composite pressure pipe, etc. problems, to achieve the effect of ensuring accuracy, high reference level, and simplifying experimental detection steps
Active Publication Date: 2018-10-12
ZHEJIANG XINZHOU BAMBOO BASED COMPOSITES TECH +1
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Problems solved by technology
There are various experimental methods about tensile properties in the prior art (for example, China National Standard GB / T 1447 "Test Method for Tensile Properties of Fiber Reinforced Plastics"), but because the bamboo composite pressure pipe is based on bamboo, Using thermosetting resin as adhesive, pipes made by winding process, the specific bamboo winding process (such as bamboo winding direction, etc.) will lead to a large difference in anisotropy in the final bamboo composite pressure pipe, directly apply the existing drawing The conclusions drawn from the tensile strength test method cannot fully reflect the axial tensile properties of bamboo composite pressure pipes
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[0028] First take the sample. Along the axial direction of the bamboo composite pressure tube to be tested, a rectangular sample with a width of B and a length of L is cut out, and the length direction of the rectangle is parallel to the axial direction of the bamboo composite pressure tube to be tested; and, in this Two lengths of the rectangular sample are provided with grooves on the limit of L, and the bottom surfaces of these two grooves are parallel to each other, and are all parallel to the axial direction of the bamboo composite pressure tube to be tested; the two grooves The length of the bottom surface is L 2 , and the distance between the bottom surfaces of the two grooves is b; in addition, the sample is axisymmetric with respect to the length and width directions of the rectangle.
[0029] The shape and size of the final sample are as follows figure 1 Shown; The concrete size of tensile sample can be flexibly adjusted according to the nominal diameter of bamboo ...
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The invention discloses a method for detecting initial axial tensile strength of bamboo composite pressure pipe. The method comprises the following steps: (1) the preparation of a sample: rectangular samples with the same width B and length L are cut along an axial direction of the bamboo composite pressure pipe to be detected, and the length directions of the rectangular samples are parallel to the axial direction of the bamboo composite pressure pipe to be detected; (2) the test of tension: the samples are clamped by clamps and installed on a tensile testing machine, and then uniform and continuous loads are loaded for the samples till the samples are broken; breaking loads F corresponding to the breaking times of the samples are recorded, and the initial axial tensile strengths Ft1 of the samples are obtained. According to the invention, the obtained Ft1 can directly reflect the axial tension performance of the bamboo composite pressure pipe, the technology effect for simplifying the axial tension performance determination process is realized, the obtained conclusion has high accuracy, and the axial tension performance of the bamboo composite pressure pipe is comprehensively reflected.
Description
technical field [0001] The invention belongs to the technical field of bamboo composite pressure pipes, and more specifically relates to a method for detecting the initial axial tensile strength of bamboo composite pressure pipes. Background technique [0002] Bamboo material is a renewable green environmental protection material. In recent years, with the increasing maturity of bamboo composite pressure pipe related technologies (for example, Chinese patent documents CN101571213A, CN202327397U), bamboo composite pipe, as a pipeline that can withstand a certain pressure, is used in water supply and drainage. It can generally replace traditional pipes such as PVC pipes, polyethylene pipes, glass steel pipes, cement pipes, spiral welded pipes, and ductile iron pipes in engineering, farmland irrigation, and petrochemical anticorrosion, and has a good application prospect. [0003] After the bamboo composite pressure pipe is finished, it is necessary to measure the withstand str...
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IPC IPC(8): G01N3/08G01N3/04
Inventor 叶柃朱鑫张淑娴牛琳
Owner ZHEJIANG XINZHOU BAMBOO BASED COMPOSITES TECH