Physical and Mechanical Properties of Phyllostachys pubescens According to Growth Age or Felling Time

죽령 및 벌채시기에 따른 맹종죽재의 물리적ㆍ기계적 특성

  • 안상열 (경상대학교 산림과학부) ;
  • 신훈재 (경상대학교 산림과학부) ;
  • 변희섭 (경상대학교 산림과학부, 농업생명과학연구원) ;
  • 박상범 (임업연구원 남부임업시험장) ;
  • 공영토 (임업연구원 임산공학부)
  • Published : 2003.06.01

Abstract

The Phyllostachys pubescens planted in the Nambu forest Experiment was used for this study. The growth ages of the P. pubescens were 1, 2 and 3 years, respectively. The experiment was carried out every month in between June of 2001 and May of 2002. The p. pubescens were divided into upper, middle and lower parts according to the growing points. The static modulus of elascity($MOE_d$) and dynamic modulus of elascity($MOE_d$) were investigated for the physical and mechanical properties of the P. pubescens. The density, MOEs and $MOE_d$according to the growing points were highest in the upper part of the P. pubescens. Generally, density and MOEs and $MOE_d$ of the P pubescens for 3 years grows larger every month. However, moisture content, MOEs and $MOE_d$ of the P. pubescens for 1, 2 years had nothing to do with growth ages and felling time. In the case of the relationships between average MOEs and $MOE_d$ the correlation coefficient was 0.88 in between June of 2001 and May of 2002. Also, $MOE_d$ showed about 18.5% higher than MOEs. Generally, the equally expressed in research that was known that $MOE_d$ of wood is higher than MOEs of wood. Therefore, the $MOE_d$ using a resonance frequency mode is useful as a nondestructive evaluation(NDE) method for predicting the MOE of the P. pubescens.