Evaluation of Varying Ductile Fracture Criteria for 42CrMo Steel by Compressions at Different Temperatures and Strain Rates

Table 1

An approximate analytical formula for the VDFC of 42CrMo steel.

VDFC	Exponents	Remarks
𝑧=𝑎+𝑏𝑥+𝑐𝑦+𝑑𝑥^2+𝑒𝑦^2+𝑓𝑥𝑦+𝑔𝑥^3+ℎ𝑦^3+𝑖𝑥𝑦^2+𝑗𝑥^2𝑦	𝑎=34.178246	Error = 0.0058031112
	𝑏=1.5461689
	𝑐=−0.08381634
	𝑑=−0.057663468
	𝑒=6.8770317𝑒−05
	𝑓=−0.002485447
	𝑔=−0.0073097269
	ℎ=−1.8770657𝑒−08
	𝑖=9.9622534𝑒−07
	𝑗=3.8651909𝑒−05