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• W2130147200 abstract "The notion of functionally graded materials (FGM) covers all domains of discrete and smooth gradation of material microstructure designed in order to obtain macroscopic features suitable for a given application. A special class of multi-phase materials with graded microstructure can be obtained at cryogenic temperatures as a result of smooth transition from the parent phase to the secondary phase. The required continuously graded material features are obtained at low temperatures via the mechanism of controlled strain induced phase transformation from the purely austenitic to the martensitic lattice (γ → α′). Several families of ductile materials are known to behave in a metastable way when strained at very low temperatures. Among them the austenitic stainless steels are extensively used to construct components of the superconducting magnets, cryogenic transfer lines and other structural members loaded in cryogenic conditions. The constitutive model used to describe mathematically the plastic strain induced phase transformation at low temperatures involves strain hardening where two fundamental effects play an important role: interaction of dislocations with the martensite inclusions and increase in material tangent stiffness due to the mixture of harder martensite with softer austenite. The interaction of dislocations with the martensite inclusions is reflected by the hardening modulus that depends on the volume fraction of martensite. Here, a linear approximation, based on the micro-mechanics analysis, is used. On the other hand, evaluation of the material tangent stiffness of two-phase continuum is based on the classical homogenization scheme and takes into account the local tangent moduli of the components, as postulated by Hill [Hill, R., 1965. A self consistent mechanics of composite materials. J. Mech. Phys. Solids 13, 213–222]. In the present paper, the Mori–Tanaka homogenisation scheme is applied. Both effects contribute to strong nonlinear hardening that occurs as soon as the phase transformation process begins. The material model is suitable for a wide range of temperatures, however the best results are obtained at very low temperatures, where the linearized kinetic law of phase transformation is valid [Garion, C., Skoczeń B., 2002. Modeling of plastic strain induced martensitic transformation for cryogenic applications. J. Appl. Mech. 69 (6), 755–762]. As the application field the structural members in the form of rods (cylinders) of circular cross-section, used as parts of the carrying structures, are analyzed. The required graded microstructure of the material is obtained by imposing torsion at cryogenic temperatures. Both the intensity of the phase transformation and the depth of the transformed zone is obtained by suitable kinematic control (angle of twist). The closed form solutions for the stress state and torque as a function of the angle of twist are shown." @default.
• W2130147200 created "2016-06-24" @default.
• W2130147200 creator A5043370075 @default.
• W2130147200 date "2007-08-01" @default.
• W2130147200 modified "2023-10-18" @default.
• W2130147200 title "Functionally graded structural members obtained via the low temperature strain induced phase transformation" @default.
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• W2130147200 doi "https://doi.org/10.1016/j.ijsolstr.2006.12.032" @default.
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