High-Strain-Rate Terminology
Concise reference for high-strain-rate material terms — strain rate, flow stress, rate sensitivity, DIF, adiabatic, Taylor-Quinney, shear band.
Key terms
- Strain rate: rate of change of strain with time (s^-1)
- Flow stress: stress required to continue plastic deformation
- Strain-rate sensitivity: increase in flow stress with strain rate
- DIF: dynamic increase factor — ratio of dynamic to quasi-static flow stress
- Adiabatic: no heat transfer — plastic work converted to heat locally
- Taylor-Quinney coefficient: fraction of plastic work converted to heat (~0.9)
- Thermal softening: reduction in flow stress with increasing temperature
- Adiabatic shear band: narrow band of intense shear with thermal softening
- Strain-rate hardening: increase in flow stress due to high strain rate
- Constitutive model: mathematical model of material stress-strain behaviour