Rheology is the research area focused on the deformation and flow behavior of materials under applied stresses, encompassing solids, liquids, and complex soft matter such as polymers, suspensions, emulsions, and gels. It investigates constitutive relationships between stress, strain, and strain rate, characterizing viscoelastic, plastic, and non-Newtonian responses using theoretical, computational, and experimental methods. Rheological studies quantify properties like viscosity, elasticity, yield stress, and relaxation spectra, often via shear, extensional, and oscillatory tests. The field underpins the modeling of microstructure–flow coupling, time- and rate-dependent behavior, and instabilities, with relevance to materials design, process engineering, and the interpretation of continuum-level transport phenomena.
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