Strain Rate Effects

• Lowest range of strain rates ? creep and ?Relaxation

• Intermediate range 10-4 < ? < 10-2 ? Tensile test

• Highest range ? shock wave or explosive test

• Stress-strain curves can be sensitive to strain rate ?

  • flow stress increases with strain rate
  • work hardening rate may be affected too

• Strain rate sensitivity (m) is given as:

m = ? ln ?

? ln ?

2-6

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