000004857 001__ 4857
000004857 005__ 20141119144559.0
000004857 04107 $$aeng
000004857 046__ $$k2002-06-02
000004857 100__ $$aRamanathan, Guruprasad
000004857 24500 $$aEXPERIMENTAL AND COMPUTATIONAL METHODS FOR SHAPE MEMORY ALLOYS

000004857 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004857 260__ $$bColumbia University in the City of New York
000004857 506__ $$arestricted
000004857 520__ $$2eng$$aThe unique properties of Shape Memory Alloys (SMA) have drawn the interest and attention of both engineers and scientists alike. The mechanisms that govern these behaviors are still a subject of research and there is a need for the development of reliable constitutive relationships. This work focuses its attention on one such interesting material viz. TiNi that is enjoying the widest application due to its superior memory and structural properties. The first step in developing a constitutive model is to understand the behavior of these materials under combined thermal and mechanical loading cycles. A series of tests were designed and conducted. The testing methodology and specimen preparation for the High Resolution Electron Microscopy is discussed. Finally we present comparisons between our experimental results and those conducted independently by other research groups. A general inelastic framework for the derivation of general three-dimensional thermomechanical constitutive laws for materials undergoing phase transformation is used. The framework is the result of combination of elements from generalized plasticity theory and the theory of continuum damage mechanics. This formulation is capable of accommodating the multiple and interacting loading mechanisms, which is an integral part of the modeling of materials with phase transformations like SMA. This is then used to develop an internal variable thermomechanical constitutive model for SMA materials. The model's predictive capabilities in describing important material characteristics, associated with internal phase transformations are assessed. These include shape memory effect, stress-strain-temperature relations for pseudoelasticity under monotonic and cyclic loading, and energy dissipation of the material that governs its damping behavior.

000004857 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004857 653__ $$aPlasticity, SMA, constitutive modeling

000004857 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004857 720__ $$aRamanathan, Guruprasad$$iPanoskaltsis, Dr.Vassilis P.$$iMullen, Dr. Robert L.$$iWelsch, Dr. Gerhard
000004857 8560_ $$ffischerc@itam.cas.cz
000004857 8564_ $$s1151028$$uhttps://invenio.itam.cas.cz/record/4857/files/439.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004857 962__ $$r4594
000004857 980__ $$aPAPER