原木横截面应力波传播时间等值线绘制及影响因素分析

doi:10.11707/j.1001-7488.20140414

Abstract

Abstract:

The change of stress wave time (SWT) or velocity in the cross section of standing trees is usually used for the evaluation of its internal decay. The velocity change is closely related with the transmitting path of stress wave, so the study of stress wave transmitting path is the basis of inner decay testing of trees and logs. Stress wave method was employed to test Populus ussuriensis log specimen for obtaining SWT data, which were then used to simulate the SWT isolines by Matlab. The effects of temperature and cavity defect on the SWT isolines on the cross section were also discussed. The results showed that the shape of SWT isoline was arc on the cross section of intact log, which transmited fast in longitudinal and slow in tangential. The velocity of stress wave in log at cold temperature was higher than that in room temperature. The shapes of SWT isolines in defective log were significantly different with that in intact log. Cavity changed the transmitting path of stress wave and enlarges SWT value. When stress wave propagates to the area behind the cavity, SWT increased as the diameter of cavity increases, which was very significant in longitudinal direction.

Key words: stress wave time (SWT), log, nondestructive testing, isolines

CLC Number:

S781.51

Xu Huadong, Xu Guoqi, Wang Lihai, Yang Xuechun. Construction of Stress Wave Time Isolines on Log Cross Section and Analysis of Its Effect Factors[J]. Scientia Silvae Sinicae, 2014, 50(4): 95-100.

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Construction of Stress Wave Time Isolines on Log Cross Section and Analysis of Its Effect Factors

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