Print Email Facebook Twitter Strain Softening Title Strain Softening: Linear and nonlinear response of weakly attractive soft particles Author Kumar, Abhishek (TU Delft Mechanical, Maritime and Materials Engineering) Contributor Tighe, B.P. (mentor) Degree granting institution Delft University of Technology Programme Mechanical Engineering | Solid and Fluid Mechanics Date 2018-01-26 Abstract Emulsions and foams are commonly found in products made by industries ranging from thoseassociated with food and pharmaceuticals to those involved in selling personal care products.This work is motivated by the need for accurate models of their mechanics, which can then beused for efficient processing.They can be thought of as soft repulsive spheres that can overlap with one another to acertain extent, along with a weakly attractive potential between the spheres. We study suchsystems in the context of the jamming transition - a transition seen in disordered systemsfrom a flowing state to one where they jam and develop rigidity. The canonical model forthe jamming transition is one of soft, repulsive and frictionless spheres which describe manycommon physical systems. An attractive tail is added to the repulsive potential used in thiscanonical model, in order to describe systems like emulsions and foams.We compare the linear response of emulsions and foams with that of the canonical model.Recent studies have shown for the canonical model that when we impose a quasi-static shearstrain at the boundaries of disordered systems, the linear elastic regime survives for a smallwindow close to the beginning of the straining action. It gives way to softening in the linearelastic regime, associated with the beginning of a nonlinear response regime. We investigatehow this window leading to the non linear response changes for emulsions and foams. Thepredictions obtained for softening, from ideas that derive from linear response in the jammingtransition and by imposing a quasi-static shear strain is compared for both emulsions and thecanonical model. Subject jammingemulsionsattractive particlesshear strainlinear responsenonlinear responsesoft matterFoamrheology To reference this document use: http://resolver.tudelft.nl/uuid:58e1118b-01f2-459e-993d-0b2b8f8a0fe2 Part of collection Student theses Document type master thesis Rights © 2018 Abhishek Kumar Files PDF thesis_Abhishek_Kumar.pdf 8.54 MB Close viewer /islandora/object/uuid:58e1118b-01f2-459e-993d-0b2b8f8a0fe2/datastream/OBJ/view