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| Mechanical Properties | ||||||||||||||||||
| Tangent
& Secant Modulus
· The
bulk modulus may be related to thermodynamic expressions for either the
isothermal or adiabatic material response:
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Some
materials, such as polymers and elastomers, have a non-linear elastic response
and a modulus is defined for a given state of strain.
· The Tangent modulus at (σ2, ε2) is: Et = (dσ/ dε)2 The Secant modulus at (σ1, ε1) is: Es = (Δσ/ Δε)1 |
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| From: Callister, "Materials Science and Engineering," Wiley (1994) | ||||||||||||||||||