Method for measuring long-term tensile strength of recombined composite structure bamboo
A technology of composite structure and tensile strength, applied in the direction of applying stable tension/pressure to test material strength, preparation of test samples, etc., can solve problems such as no similar evaluation technical content found, and achieve reliable data support Effect
Active Publication Date: 2019-04-30
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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From the above methods and literature, no similar evaluation technical content was found
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[0019] The assay method of the long-term tensile strength of the reorganized composite structure bamboo that the present invention proposes may further comprise the steps:
[0020] (1) Process the recombined composite structure bamboo to be tested into 2n tensile test pieces, each tensile test piece is in the shape of a dumbbell, such as figure 1 As shown, the cross-sectional size of the two ends of the dumbbell-shaped tensile test piece is 50×20mm, the central cross-sectional size of the tensile test piece is 5×20mm, and the n tensile test pieces in the 2n test pieces are For short-term mechanical tests, the other n tensile test pieces in the 2n test pieces are used for long-term mechanical tests;
[0021] (2) Through the short-term mechanical test, determine the stress that should be applied when the recombined composite structure bamboo to be tested is carried out in the long-term mechanical test. The specific process is as follows:
[0022] (2-1) Test the n tensile specim...
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Abstract
The invention relates to a method for measuring the long-term tensile strength of recombined composite structure bamboo, and belongs to the technical field of green bamboo building materials. The method comprises the following steps: firstly, machining a recombined composite structure bamboo tensile test piece for a short-term mechanical test and a long-term mechanical test according to a test sample matching method; determining the stress level to be applied in the long-term mechanical test through the short-term mechanical test; through a long-term mechanical test, obtaining the damage timeof the bamboo tensile test piece; carrying out regression analysis on the damage time of the recombined composite structure bamboo tensile test piece by taking the strength ratio of the recombined composite structure bamboo tensile test piece as an independent variable to obtain a fitting parameter value; and, according to the actually designed service life of the recombined composite structure bamboo component, calculating the long-term tensile strength of the recombined composite structure bamboo corresponding to the service design life. According to the method, the long-term tensile strength of the recombined composite structure bamboo is accurately and quantitatively evaluated, and the measurement result can be used as data support for application and popularization of the recombined composite structure bamboo in a building structure.
Description
technical field [0001] The invention relates to a method for measuring the long-term tensile strength of recombined composite structure bamboo, which belongs to the field of green bamboo building materials. Background technique [0002] Reconstituted composite structure bamboo is a new type of bamboo composite material made of bamboo through rolling, drying, dipping and pressing, and it has broad application prospects in the field of green building materials. Since recombined composite structural bamboo is a typical biomass material, its strength will decrease under long-term loads, and determining the long-term strength index of recombined composite structural bamboo is a prerequisite for its application in the field of building structures. However, due to the lack of a method for measuring the long-term strength of recombined composite structural bamboo, it is impossible to accurately and quantitatively evaluate the long-term strength of recombined composite structural bam...
Claims
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IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/28G01N3/08
Inventor 钟永武国芳任海青罗翔亚黄成建
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY