Method for detecting live stumpage strength nondestructively

A non-destructive testing, living standing wood technology, applied in the direction of wood testing, material inspection products, etc., can solve the problems of inability to truly reflect the overall information, low long-term continuous monitoring ability, and the number of sample trees cannot be too many, so as to improve the long-term continuous monitoring ability. , The effect of strong field operation ability and convenient follow-up work
CN101231280BInactive Publication Date: 2011-05-04INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
Publication Date
2011-05-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a nondestructive measuring method for the intension of a live standing tree. The method includes the steps that: step one, a live standing tree to be measured is selected, and the spread velocity V of a mechanical wave is measured at an area to be measured; step two, a consecutive and integrated tree core with diameter of 3 to 12 mm is taken radially in the area to be measured; step three, the mass of the tree core is weighted and the volume of the tree core is measured on the spot, thereby obtaining the density Rho of the tree core; step four, an elastic modulus Ed is calculated according to the formula that E is equal to V<2>Rho; wherein, the Ed is the elastic modulus of the live standing tree. The invention can perform examination without needing to cut down the live standing tree, not only the detection efficiency is high, but also the detection labor intensity is small.
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Description

technical field

[0001] The invention relates to a non-destructive testing method for the strength of standing trees. Background technique

[0002] The detection of the strength of standing trees is mainly to generate mechanical waves in the xylem region of living trees by means of tapping, current pulse, etc., and according to the relationship between the elastic modulus E of the material, the propagation speed of mechanical waves V and the material density ρ E=V 2 ρ to calculate the elastic modulus E d , where the E d is the elastic modulus of the standing tree, and finally realizes the detection of the strength of the standing tree.

[0003] At present, in the detection process of standing trees, the method of density measurement is: felling the standing trees, and then using tools such as knives and saws to intercept log segments, discs or blocks for traditional measurement, that is, according to the formula: density is equal to mass and volume ratio. The disadvantage...

Claims

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