The present work investigates the thermodynamic inconsistencies in the definition of the compatibility conditions on stress for constant and nonconstant material functions in one-dimensional modeling of shape memory alloys based on the first principles. In this work, simplifications are provided validating inconsistencies in the earlier proposed non-constant material functions used to satisfy compatibility conditions. It is presented that the inconsistencies originate due to an incorrect definition of the compatibility conditions on stress. In the first step, it is shown that, due to inconsistent definitions of the compatibility conditions, the material functions cannot be derived from the first principles. Consequently, it is presented that the material functions result in an incorrect form of the differential constitutive equation. Furthermore, it is also analyzed that these incorrect definitions on the compatibility conditions result in an inconsistent form of nonconstant material functions as well as the differential equation, which are proposed in earlier models. As a result, in the present work the consistent definition of the compatibility conditions for one-dimensional shape memory alloy models is derived. Next, the new and correct definition for the compatibility conditions is proposed, which is used to derive a new and consistent form of nonconstant material function. Finally, a consistent form of non-constant material function and differential equation are derived from first principles, which satisfy the new definition of compatibility conditions on stress.
|Number of pages||23|
|Journal||International Journal for Multiscale Computational Engineering|
|State||Published - 2020|
Bibliographical noteFunding Information:
This work was supported with resources and the use of facilities at the Central Arkansas Veterans Healthcare System and was supported by NIH Grant 5 R01 DK25540 to T.E. Andreoli. A preliminary report of these studies has appeared elsewhere (abstract; Mikhailova et al; World Congress of Nephrology, J Am Soc Nephrol 12:36A–37A, 2001). We are grateful for the technical assistance provided by Ms. Anna Grace Stewart and for assistance in preparing this manuscript provided by Ms. Clementine M. Whitman.
© 2020 by Begell House, Inc.
- Compatibility conditions
- Differential and integrated constitutive relations
- Material functions
- One-dimensional constitutive model
- Shape memory alloys
ASJC Scopus subject areas
- Control and Systems Engineering
- Computational Mechanics
- Computer Networks and Communications