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Strain and Stiffness
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Posted by: geoffrey

03/04/2004, 21:36:01

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Does anyone would like to tell me, what is difference between Strain and stiffness. And their definition please!

Thank you and Regards Geoffrey Faculty of Engineering University of Technology, Sydney Email :

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Re: Strain and Stiffness
Re: Strain and Stiffness -- geoffrey Post Reply Top of thread Forum
Posted by: ReubenAG

03/07/2004, 14:24:52

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Strain can be either longitudinal (length related) or rotational (anglular). Either way, the "engineering strain" is defined as the change in length per unit length of the object being loaded longitudinally or the change in angle per unit length of the object being twisted. FYI, stress = elastic modulus x strain provided the material hasn't yielded. There are different definitions for true stress and true strain but these are seldom used outside research.

Stiffness is simply the force required to deflect something one unit of length, or the torque required to twist something through one unit of angle (radians).

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