A method for measuring the long-term tensile strength of recombined composite structure bamboo
A composite structure and tensile strength technology, which is applied in the application of stable tension/compression to test the strength of materials and the preparation of samples for testing. Effect
Active Publication Date: 2021-04-13
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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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 bamboo with a recombined composite structure, belonging to the technical field of green bamboo building materials. Firstly, according to the sample matching method, the tensile specimens of bamboo with recombined composite structure were processed for short-term mechanical tests and long-term mechanical tests; through short-term mechanical tests, the stress level that should be applied in long-term mechanical tests was determined; through long-term mechanical tests, bamboo The failure time of the tensile test piece; with the strength ratio of the bamboo tensile test piece of the recombined composite structure as an independent variable, the regression analysis was carried out on the failure time of the bamboo tensile test piece of the recombined composite structure, and the fitting parameter value was obtained; according to the recombined composite structure The actual designed service life of the bamboo components is calculated to obtain the long-term tensile strength corresponding to the recombined composite structural bamboo. The method of the invention accurately and quantitatively evaluates the long-term tensile strength of the recombined composite structure bamboo, and the measurement result can be used as data support for the application and popularization of the recombined composite structure bamboo in building structures.
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...
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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