Method for detecting live stumpage strength nondestructively

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.

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...

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Problems solved by technology

[0004] (1) Density can be measured after the standing trees need to be cut down, and the standing trees stopped growing after the measurement, resulting in a waste of forest resources;

[0005] (2) The process of felling standing trees and cutting log segments, discs or blocks is labor-intensive and takes a long time, and certain protective measures need to be taken to ensure the safety of personnel;

[0006] (3) It is necessary to carry heavy tools such as chain saws, and the weather and environmental conditions must be considered during the operation process, so the field operation ability is weak

[0007] (4) Since the density of standing trees must be felled, the number of sample trees measured cannot be too many, so it cannot truly reflect the overall information of the detected object

[0008] (5) The premise of felling living trees determines that it is impossible to carry out regular detection, which makes the long-term continuous monitoring ability of standing trees detection to the wood properties in the process of tree growth low

[0009] (6) The whole detection process is cumbersome and the detection speed is slow

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