Influence of the Measurement Methods on the Mode ‡TFracture Toughness of Wood
Hiroshi Yoshihara and Takuji Kawamura
Abstract:In this work, we examined the validity of four methods for measuring the mode I fracture toughness of wood; double cantilever beam (DCB), compact tension (CT), single edge notched tension (SENT), and single edge notched bending (SENB) tests, which have been frequently conducted. In the fracture tests, the crack length was variously changed, and the validity of each method was evaluated by the dependence of fracture toughness on the crack length. From the comparisons of fracture toughnesses obtained by the different four methods, the DCB test was more recommended than any other methods because the fracture toughness could be appropriately obtained in the wide range of crack length. Key Words:Mode I fracture toughness, DCB test, CT test, SENT test, SENB test