Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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The Bending Strength Properties and Acoustic Emissions to the Difference of Finger Widths

핑거공차에 따른 휨강도 성능과 AE 특성

  • Ryu, Hyun-Soo (College of Agriculture, Gyeongsang National University) ;
  • Ahn, Sang-Yawl (College of Agriculture, Gyeongsang National University) ;
  • Lee, Gyun-Pil (College of Agriculture, Gyeongsang National University) ;
  • Park, Han-Min (Faculty of Agriculture, Tokyo university of Agriculture and Technology) ;
  • Byeon, Hee-Seop (College of Agriculture, Institute of Agriculture and Life Science, Gyeongsang National University)
  • 류현수 (경상대학교 농과대학) ;
  • 안상열 (경상대학교 농과대학) ;
  • 이균필 (경상대학교 농과대학) ;
  • 박한민 (東京農工大學農學部) ;
  • 변희섭 (경상대학교 농과대학, 농업생명과학연구원)
  • Received : 2002.07.25
  • Accepted : 2002.09.13
  • Published : 2003.04.26
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Abstract

In this study, the three species (Populus euramericana, Pinus densiflora and Quercus variabilis) were cut to difference (0, 0.15, 0.3, 0.45 mm) between the size of tip and that of root of the finger (DSTR) and jointed with poly vinyl acetate (PVA) and resorcinol-phenol resin (RPR). We described the relationship between the bending strength properties of finger DSTR and the acoustic emission (AE) generated during the bending test. The results were as follows: The AE generation time of finger-jointed specimens with RPR adhesive was earlier than that with PVA adhesive. The AE cumulative event count of finger-jointed specimens with RPR adhesive continuously increased with increasing load and the event count was much more than that with PVA adhesive. Also, the AE cumulative event count for resorcinol-phenol resin adhesive obtained from low load level was abundant. The AE wave in finger-jointed specimens with RPR adhesive could be detected in the below proportional limit load. Therefore, AE signals from bending test are useful for the estimation of strength in finger DSTR specimens.

본 연구에서는 3 수종(이태리 포플러, 소나무, 굴참나무재)을 공차별(0, 0.15, 0.3, 0.45 mm)로 초산비닐 수지와 레소시놀-페놀 공축합 수지를 이용하여 접합 제작하였다. 휨시험에서 핑거공차에 따라서 검출되는 AE와 휨강도성능 특성을 살펴본 결과는 다음과 같았다. 레소시놀재의 AE파 발생시기가 초산재보다 빨랐으며, 레소시놀재의 AE파 사상총수는 하중의 증가와 함께 계속적으로 증가하였으며 총발생 사상총수도 초산재보다 휠씬 많이 나타났다. 또한, 레소시놀재의 AE파 사상총수는 낮은 하중에서도 많은 개수가 발생하였다. 비례한도 내에서도 레소시놀 접착제를 사용한 경우에는 많은 AE파가 검출되었다. 따라서 레소시놀 접착제로 접착한 핑거 접합재의 휨시험으로부터 얻은 AE 신호는 핑거공차에 따른 접합재의 강도 예측이나 보증에 이용 가능할 것으로 판단되었다.

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