Before revision: 237x237px|Typical plot of crack growth rate with respect to the stress intensity range where the Paris– Erdogan equation fits the central, linear region of Regime B.|alt= Paris' law (also known as the Paris– Erdogan equation) is a crack growth equation that gives the rate of growth of a fatigue crack.
After revision: 237x237px|Typical plot of crack growth rate with respect to the stress intensity range where the Paris– Erdoğan equation fits the central, linear region of Regime B.|alt= Paris' law (also known as the Paris– Erdoğan equation) is a crack growth equation that gives the rate of growth of a fatigue crack.