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Thermal emission: A probe to identify the critical point of the elastoplastic transition

1982; Elsevier BV; Volume: 1; Issue: 3-4 Linguagem: Inglês

10.1016/0167-577x(82)90023-4

1873-4979

C. E. Bottani, G. Caglioti,

High Temperature Alloys and Creep

Empirical criteria allow to define a conventional value of the yield stress, often implying overesti mates of dimensions and weight in structural design, due to the need of adopting large safety factors. A method based on ever occurring thermal emission in samples under stress is supplied here to identify the true macroscopic flow stress or point of physical yielding in 38NCD4 steel. This stress physically coincides with the thermoelastic limit, and corresponds to a sudden inversion of the trend of the temperature vs stress characteristic at the bifurcation terminating the thermodynamic branch.