Mechanics of Crack Growth : Proceedings of the Eighth National Symposium on Fracture Mechanics : A Symposium Sponsored by Committee E-24 on Fracture Testingof Metals,American Society for Testing and Materials Brown University,Providence,R.I.,26-28 Aug.1974 : ASTM STP No.590 STP 590 - ASTM (American Society for Testing and Materials (ASTM), 1976)