Vijaya B. Chalivendra

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We here report on a detailed experimental study whose goal is to investigate spontaneous crack propagation in bonded and intact materials subjected to quasi-static far-field tensile loading. The cracks nucleate from a tiny circular hole and are triggered by an exploding wire. They subsequently propagate under the action of a constant far-field load. Dynamic(More)
The conceptual simplicity and the ability of cohesive finite element models to describe complex fracture phenomena makes them often the approach of choice to study dynamic fracture. These models have proven to reproduce some experimental features, but to this point, no systematic study has validated their predictive ability; the difficulty in producing a(More)
Keywords: Validation Large-scale simulations Dynamic fracture Weak planes Cohesive zone laws a b s t r a c t A well-controlled and minimal experimental scheme for dynamic fracture along weak planes is specifically designed for the validation of large-scale simulations using cohesive finite elements. The role of the experiments in the integrated approach is(More)
All Rights Reserved iii Acknowledgements I would like to express my sincere acknowledgement of the many individuals who helped me throughout this long journey. The very first person I would like to fully acknowledge is my research advisor and mentor, Professor Gurswami Ravichandran, for his continuous trust, constant support, and strong influence throughout(More)
The objective of this study was to develop a predictive model for cell seeding depth in electrospun scaffold as a function of fiber stiffness. Electrospun scaffolds (micron and submicron) and 3T3 fibroblasts are used as scaffold-cell systems under vacuum seeding conditions. Atomic force microscopy is used to determine the Young's modulus (E) as a function(More)
The alignment and blend of extracellular matrix (ECM) proteins give a tissue its specific mechanical properties as well as its physiological function. Various tissue engineering methods have taken purified ECM proteins and aligned them into gels, sponges and threads. Although, each of these methods has created aligned ECM, they have had many limitations(More)
An experimental investigation on the effects of in vitro hydrolytic and enzymatic degradation on mechanical properties of polyglactin 910 monofilament sutures was performed by conducting nanoindentation studies using an atomic force microscope (AFM). For hydrolytic degradation, the sutures were incubated in phosphate buffered saline (PBS) solution at three(More)
Large scale simulations using cohesive zone interfacial elements were used to understand features such as penetration and deflection of crack during the process of interaction of mode-I crack with inclined interfaces. To perform these simulations, two set of inputs are necessary. The first one is to provide valid loading boundary conditions and the second(More)
Catastrophic failure of any brittle structure under dynamic loading consists of dynamic crack initiation, propagation, curving, branching (both micro and macro) and branching instability. However, the failure is much more complex in case of layered materials which has interfaces. In these materials, other than above crack mechanisms the crack can also(More)