Principle of material objectivity

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Principle of material objectivity is an obsolete term and should be replaced by principle of material frame-indifference.

Here is a precise statement of the Principle:

The constitutive laws governing the internal conditions of a physical system and the interactions between its parts should not depend on whatever external frame of reference [1] is used to describe them.

In physics, a frame of reference consists of an abstract coordinate system and the set of physical reference points that uniquely fix the coordinate system and standardize measurements.

"I was responsible for introducing the obsolete term in 1958 and now regret that I misled a lot of people", Walter Noll.

Walter Noll American mathematician

Walter Noll was a mathematician, and Professor Emeritus at Carnegie Mellon University. He is best known for developing mathematical tools of classical mechanics, thermodynamics, and continuum mechanics.

See also

Objective stress rate

In continuum mechanics, objective stress rates are time derivatives of stress that do not depend on the frame of reference. Many constitutive equations are designed in the form of a relation between a stress-rate and a strain-rate. The mechanical response of a material should not depend on the frame of reference. In other words, material constitutive equations should be frame-indifferent (objective). If the stress and strain measures are material quantities then objectivity is automatically satisfied. However, if the quantities are spatial, then the objectivity of the stress-rate is not guaranteed even if the strain-rate is objective.

In continuum mechanics, a hypoelastic material is an elastic material that has a constitutive model independent of finite strain measures except in the linearized case. Hypoelastic material models are distinct from hyperelastic material models in that, except under special circumstances, they cannot be derived from a strain energy density function.

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References

  1. Note: A frame of reference is very different from a coordinate system. Contrary of some people's opinion, the principle has nothing to do with coordinate systems.