The Conversion of Plastic Work to Heat Around a Dynamically Propagating Crack in Metals
Abstract
Investigations of the temperature rise at a dynamically propagating crack tip using an infrared detector array are reported. Also, a measurement of the fraction of plastic work converted to heat using a split hopkinson bar apparatus in conjunction with an infrared detector array is summarized. For 4340 steel it is seen that approximately 85% of the plastic work is converted to heat leading to a temperature rise of 300 deg C at a crack tip propagating 600 m/s in steel. This results is compared to earlier studies that report a 450 deg C temperature rise at a crack tip propagating 900 m/s in steel. In a titanium alloy the temperature rise is higher than that in steel for equal plastic work rate densities. The conditions at the crack tip are shown to be adiabatic, and, as a result, this effect is due to the difference in density, heat capacity and crack tip speed. Thermal conductivity has no effect.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1991
- Accession Number
- ADA253801
Entities
People
- A. J. Rosakis
- G. Ravichandran
- J. J. Mason
Organizations
- California Institute of Technology