Strain Driven Versus Stress Driven
Strain Driven Versus Stress Driven
(OP)
Can someone expand on the idea of a structures response being strain driven versus stress driven?
When one says the response of the structure is strain driven, is this simply saying it is a non-linear response (creep or plasticity)?
When one says the response of the structure is strain driven, is this simply saying it is a non-linear response (creep or plasticity)?






RE: Strain Driven Versus Stress Driven
RE: Strain Driven Versus Stress Driven
RE: Strain Driven Versus Stress Driven
To me strain driven implies that deflection or deformation is critical, while for stress driven strength would be critical.
RE: Strain Driven Versus Stress Driven
Mike Halloran
Pembroke Pines, FL, USA
RE: Strain Driven Versus Stress Driven
RE: Strain Driven Versus Stress Driven
RE: Strain Driven Versus Stress Driven
A strain-driven system means that something else is inducing a deflection (or, I suppose, a thermal expansion or contraction). Any stress seen in the member is an effect of the induced strain.
An example of a stress-driven system would be, say, something acting under gravity loads. Any strain seen in the member is a result of the induced stress.
In practice, I've only dealt with these terms in the context of testing machines. In a system that is not linear elastic, you will get different stress-strain curves and hysteresis loops depending on whether you control the stress or the strain. Apparently this also comes up in the context of metal crystal growth, but I don't know anything about that.
Hg
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RE: Strain Driven Versus Stress Driven
Yeah I think your on the right line.
In the contex of solder, I understand it to be:
In a limited temeprature range your in the "elastic" region of the solder. The strains are due to the imposed stresses of the material from CTE mismatch. If you increase the temeprature you enter the non-linear region of the material (Creep). Creep induces a strain which alters the stress response of the material. So then it is a strain effect inducing a stress. Similarly, with plastic strain which induces residual stresses despite the change in loading after the yield point was reached.
RE: Strain Driven Versus Stress Driven
Hg
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RE: Strain Driven Versus Stress Driven
Applying a force to a material which induces a stress or creep strain, makes sense in my mind that the response is only due to the applied force. Any other thoughts?