Non‐destructive testing

Abstract

Takashi Nakai and Toshinari Tanaka of the Forestry and Forest Products Research Institute in Japan present the results of tests, using the easy handling and reasonable cost technique of fundamental vibration frequency measurement, on larger than usual cross‐sections. Modulus of elasticity measurements showed this method to have high possibilities for stress grading, overcoming the size limitations of existing commercial equipment at the saw mill or lumber yard. This paper was first presented at CIB Working Commission W18a in Vancouver in September 1988.