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Materials with memory

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In continuum physics, materials with memory, also referred as materials with hereditary effects are a class of materials whose constitutive equations contains a dependence upon the past history of thermodynamic, kinetic, electromagnetic or other kind of state variables.

Historical notes

The study of these materials arises from the pioneering articles of Ludwig Boltzmann[1] and Vito Volterra,[2] in which they sought an extension of the concept of an elastic material.[3] The key assumption of their theory was that the local stress value at a time t depends upon the history of the local deformation up to t. In general, in materials with memory the local value of some constitutive quantity (stress, heat flux, electric current, polarization and magnetization, etc.) at a time t depends upon the history of the state variables (deformation, temperature, electric and magnetic fields, etc.). The hypothesis that the remote history of a variable has less influence than its values in the recent past, was stated in modern continuum mechanics as the fading memory principle by Bernard Coleman and Walter Noll.

Constitutive relations of materials with memory

In the linear case, this relation takes the form of a Volterra equation

See also

Notes

References

Articles

Books