where ac is the critical crack length.
The team used the following equation to calculate the stress intensity factor: principles of fracture mechanics rj sanford pdf pdf work
where da/dN is the crack growth rate, C and m are material constants, and ΔK is the stress intensity factor range. where ac is the critical crack length
K = (σ√(πa)) * Y
da/dN = 10^(-10) * (50 MPa√m)^2.5 = 2.5 * 10^(-5) inches/cycle C and m are material constants