Thermodynamic investigation with synergetic method on inner crack growth behavior at very high cycle fatigue regime

This paper presents a thermodynamic characterization method for estimating the internal crack growth rate, which has been a puzzle in very high cycle fatigue research. A theoretical approach of surface temperature is discussed with crack size, initiation site, and time for thin sheet material. Infrared thermography is used to study the inner crack behavior and the heat dissipation phenomenon under 20 kHz vibration loading on high-strength stainless steel. A numerical simulation reveals the consequent temperature elevation on the surfaces by the heat generation at the crack tip and the heat conduction. Ultimately, the internal crack growth rate and final fatigue failure prediction are obtained by combining the calculation of heat dissipation and the observed evolution of the surface temperature field.

Automated summary

This paper presents a thermodynamic characterization method for estimating the internal crack growth rate in very high cycle fatigue research. It discusses a theoretical approach for surface temperature considering crack size, initiation site, and time for thin sheet material. Infrared thermography is used to study the inner crack behavior and heat dissipation phenomenon on high-strength stainless steel under 20 kHz vibration loading. A numerical simulation reveals the temperature elevation on surfaces caused by heat generation at the crack tip and heat conduction. Ultimately, the internal crack growth rate and final fatigue failure prediction are obtained by combining the calculation of heat dissipation and the observed evolution of the surface temperature field.