The stress and deformation fields in a SMA ring or a thick-walled cylinder loaded by internal pressure at constant temperature (over the start temperature of the martensitic transformation) are determined in closed form under plane stress loading conditions. The phenomenological SMA constitutive model incorporates the volume fractions of multi-variants Martensite, which are assumed to evolve linearly with the Tresca effective stress, according to the associative flow rule and the corner flow rule. Initially, the cylinder is everywhere in a state of Austenite. The application of an internal pressure then triggers the martensitic transformation starting from the inner radius of the cylinder wall and extending towards the outer radius. If the wall thickness is large enough, the tangential stress may vanish at the inner radius and correspondingly the stress state may reach a corner of the Tresca transformation condition, thus originating two different Martensite variants according to the corner transformation rule. The admissible phase partitions within the wall thickness originating during the loading process have been systematically investigated according to the ratio between the outer and inner radii. The results obtained here suggest that the loading process should be interrupted soon after the complete martensitic transformation is achieved at the inner radius of the cylinder to avoid permanent plastic deformations.
Evolution of multiple Martensite variants in a SMA thick-walled cylinder loaded by internal pressure / Radi, Enrico. - In: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES. - ISSN 0020-7683. - 155(2018), pp. 15-35.
|Data di pubblicazione:||2018|
|Data di prima pubblicazione:||3-lug-2018|
|Titolo:||Evolution of multiple Martensite variants in a SMA thick-walled cylinder loaded by internal pressure|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ijsolstr.2018.06.034|
|Codice identificativo ISI:||WOS:000453114100002|
|Codice identificativo Scopus:||2-s2.0-85053720421|
|Citazione:||Evolution of multiple Martensite variants in a SMA thick-walled cylinder loaded by internal pressure / Radi, Enrico. - In: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES. - ISSN 0020-7683. - 155(2018), pp. 15-35.|
|Tipologia||Articolo su rivista|
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