응력파를 이용한 신갈나무 입목의 내부열화 비파괴 평가 연구
A Study on the Nondestructive Evaluation of Internal Deterioration of Oak(Quercus mongolica) Trees Using Stress Wave
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Visual observation was performed on the domestic red oak tree, and internal deterioration was evaluated by non-destructive evaluation using a stress wave. A study was conducted on broad-leaved forests in Yonghwasan, Hwacheon-gun, Gangwon-do. Dough and limb thickness, bark wounds, pupils, etc. were further investigated. Most of them were branched and grown due to sprout renewal, and fusion traces were mainly found after wounds in the pupils and trunks of the branch office. Non-destructive testing and actual internal cross-section survey were performed to examine the correlation between the trait evaluation of the tree and the internal deterioration. Sixteen transducers are mounted around the circumference of tree stem at 0.5, 1, and 1.5 m above the ground. A total of 7 specimens were observed to have internal deterioration (threshold value of 760 m/s). After harvesting, the cross section of the non-destructive measurement area was cut to check the actual deteriorated area. As a result, discoloration was observed in most of the sections, but it was not detected by the non-destructive test using a stress wave. However, the presence of severe rupture due to swelling in the heartwood was detected by non-destructive testing, and compared with the evaluation of standing tree traits, it was consistent with the case where the bark wound or limbs were observed.
Abstract
Visual observation was performed on the domestic red oak tree, and internal deterioration was evaluated by non-destructive evaluation using a stress wave. A study was conducted on broad-leaved forests in Yonghwasan, Hwacheon-gun, Gangwon-do. Dough and limb thickness, bark wounds, pupils, etc. were further investigated. Most of them were branched and grown due to sprout renewal, and fusion traces were mainly found after wounds in the pupils and trunks of the branch office. Non-destructive testing and actual internal cross-section survey were performed to examine the correlation between the trait evaluation of the tree and the internal deterioration. Sixteen transducers are mounted around the circumference of tree stem at 0.5, 1, and 1.5 m above the ground. A total of 7 specimens were observed to have internal deterioration (threshold value of 760 m/s). After harvesting, the cross section of the non-destructive measurement area was cut to check the actual deteriorated area. As a result, discoloration was observed in most of the sections, but it was not detected by the non-destructive test using a stress wave. However, the presence of severe rupture due to swelling in the heartwood was detected by non-destructive testing, and compared with the evaluation of standing tree traits, it was consistent with the case where the bark wound or limbs were observed.
참고문헌 (9)
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