Nondestructive evaluation (NDE) technique method using a resonance frequency by free vibration mode was carried out for damaged and sound black pine woods( Pinus thunbergii ) by Matstucoccus thunbergianae in order to utilize damaged trees. There were a close relationship of dynamic modulus of elasticity and static bending modulus of elasticity to MOR. It was found that there were a high correlation at 1% level between dynamic modulus of elasticity and MOR, and static modulus of elasticity and MOR in all conditions. However, the result indicated that correlation coefficient is higher in dynamic modulus of elasticity to MOR than that in static modulus of elasticity to MOR. Therefore, the dynamic modulus of elasticity using resonance frequency by free vibration mode is more useful as a nondestructive evaluation method for predicting the MOR of sound and damaged woods by Matstucoccus thunbergianae.

• Kyung-Rok Won(College of Agriculture & Life Science, Gyeongsang National University)
• Byung-Oh Yoo(Southern Forest Research Center, Korea Forest Research Institute)
• Kwang-Soo Lee(2Southern Forest Research Center, Korea Forest Research Institute)
• Su-Young Jung(Southern Forest Research Center, Korea Forest Research Institute)
• Song-Ho Chong(Forest Training Institute, Korea Forest Service, Namyangju city)
• Hee-Seop Byeon(College of Agriculture & Life Science, Institute of Agriculture and Life Science, Gyeongsang National University) Corresponding author