Finite element simulations map the maximum J-integral for which a valid HRR field exists in small DCB and notched cantilever specimens, showing that low-hardening materials may need M=100 instead of the commonly used M=10 or M=25.
Jayaram, Small-Scale Mechanical Testing, Annual Review of Materials Research 52 (2022) 473–523
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On the fracture mechanics validity of small scale tests
Finite element simulations map the maximum J-integral for which a valid HRR field exists in small DCB and notched cantilever specimens, showing that low-hardening materials may need M=100 instead of the commonly used M=10 or M=25.