This article describes the test methods of fracture toughness, namely, linear-elastic and nonlinear fracture toughness testing methods. Linear-elastic fracture toughness testing includes slow and rapid loading, crack initiation, and crack arrest method. Nonlinear testing comprises JIC testing, J-R curve evaluation, and crack tip opening displacement (CTOD) method. Other methods used include the combined J standard method, the common fracture toughness test, transition fracture toughness testing, and the weldment fracture testing method.
John D. Landes, Fracture Toughness Testing, Fatigue and Fracture, Vol 19, ASM Handbook, By ASM Handbook Committee, ASM International, 1996, p 393–409, https://doi.org/10.31399/asm.hb.v19.a0002380
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