Temperature dependence of the ideal fracture strength of a b.c.c. crystal

摘要: Abstract The temperature dependence of ideal strength is studied for a b.c.c. crystal in [001] and loadings. Born's criterion, with Milstein's variables, employed to determine the strength. Helmholtz free energy calculated under self-consistent Einstein model devised by Matsubara. For mathematical convenience, Gaussian type pair-wise central potential represent atomic interactions. We attempt fit both elastic constants at 0 K thermal expansion α-Fe, but cannot be fitted simultaneously. Three different potentials are used calculation results compared. value closely related predicted C 11 – 12 or Young's modulus. With which approximately experimental modulus K, fracture strain found fair agreement α-Fe whiskers. Tensile [011] loading about five ti...