College of Aeronautics;
University of Air Force Engineering;
Xi''an;
710038;
China;
College of Aeronautics;
Northwestern Polytechnical University;
Xi''an;
710072;
China College of Aeronautics;
University of Air Force Engineering;
Xi''an;
710038;
China Philips Centre for Industrial Technology;
P.O.Box 218;
5600 MD Eindhoven;
The Netherlands Delft University of Technology;
2628 CD Delft;
The Netherlands College of Aeronautics;
Northwestern Polytechnical University;
Xi''an;
710072;
China;
fracture; toughness; testing; approach; evaluated; method; fracture; mechanics; theory; plastic; deformation; theory; materials; constructive; relationship; theoretical; approach;