The aim of this book is to understand and describe the martensitic phase transformation and the process of martensite platelet reorientation. These two key elements enable the author to introduce the main features associated with the behavior of shape-memory alloys (SMAs), i.e. the one-way shape-memory effect, pseudo-elasticity, training and recovery.
Attention is paid in particular to the thermodynamical frame for solid materials modeling at the macroscopic scale and its applications, as well as to the particular use of such alloys – the simplified calculations for the bending of bars and their torsion. Other chapters are devoted to key topics such as the use of the “crystallographical theory of martensite” for SMA modeling, phenomenological and statistical investigations of SMAs, magneto-thermo-mechanical behavior of magnetic SMAs and the fracture mechanics of SMAs. Case studies are provided on the dimensioning of SMA elements offering the reader an additional useful framework on the subject.
1. Some General Points about SMAs.
2. The World of Shape-memory Alloys.
3. Martensitic Transformation.
4. Thermodynamic Framework for the Modeling of Solid Materials.
5. Use of the “CTM” to Model SMAs.
6. Phenomenological and Statistical Approaches for SMAs.
7. Macroscopic Models with Internal Variables.
8. Design of SMA Elements: Case Studies.
9. Behavior of Magnetic SMAs.
10. Fracture Mechanics of SMAs.
11. General Conclusion.
Appendix 1. Intrinsic Properties of Rotation Matrices.
Appendix 2. “Twinning Equation” Demonstration.
Appendix 3. Calculation of the Parameters a, n and Q from the “Twinning” Equation.
Appendix 4. “Twinned” Austenite/Martensite Equation.
Keywords: Materials Characterization, Shape-Memory Alloys Handbook, SMA Metallurgy Functional Properties, The Martensitic Transformation, Thermodynamical Frame For Solid Materials Modeling, Cristallographical Theory Of Martensite, Macroscopic Models, Dimensionning of SMA Elements, Magnetic SMA, SMA Fracture Mechanics