1. American Society for Testing and Materials. Standard test method for mode I interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites, ASTM Standard D5528-01; 2008.
2. Davidson BD. Determination of the mode II interlaminar toughness of unidirectional fiber reinforced polymer matrix composites using the end-notch flexure (ENF) test, ASTM Work Item WK-37680; 2012.
3. American Society for Testing and Materials. Standard test for mixed mode I–mode II interlaminar fracture toughness of unidirectional fiber polymer matrix composites, ASTM, International D6671-01/D6671M-06; 2008.
4. A finite element calculation of stress intensity factors by a modified crack closure integral;Rybicki;Eng Fract Mech,1977
5. The partition of unity finite element method: basic theory and applications;Melenk;Comput Methods Appl Mech Eng,1996