Abstract
This paper is described an indentation method to measure the Young's modulus of the early part and late part of wood material (Japanese cedar). I order to clarify the validity of the present method, the fluoro rubber and the soft vinyl, is indented. The obtained Young's modulus of fluoro rubber of the elastomer is in good accuracy. On the other hand, the Young's modulus of the soft vinyl and wood were considerably smaller than the value obtained by the other methods because of the plastic deformation. Therefore, in order to measure the Young's modulus of wood, the plastic deformation should be considered.
