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Full-Text Articles in Materials Science and Engineering
Theory And Improved Methods For Probing The Cavitation To Fracture Transition, Christopher Barney
Theory And Improved Methods For Probing The Cavitation To Fracture Transition, Christopher Barney
Doctoral Dissertations
A material is considered soft when its bulk modulus is significantly greater than its shear modulus. Rubbery polymers are a class of soft materials where resistance to extension is mainly entropic in nature. Polymeric soft solids differ from liquids due to the presence of a percolated network of strong bonds that resist deformation and flow on a given time scale. The incompressible nature, entropically driven elasticity, and molecular scale network structure of soft polymeric solids combine to impart unique mechanical behavior that often results in complex material responses to simple loading situations. An important example of this is cavitation in …
Extreme Indentation And Fracture Of Soft Polymer Gels, Shruti Rattan
Extreme Indentation And Fracture Of Soft Polymer Gels, Shruti Rattan
Doctoral Dissertations
The mechanical properties of conventional hard materials, such as metals and ceramics, have received widespread attention in the past several decades; however mechanical characterization, failure in particular, of soft materials, such as polymer gels, elastomers, and biological tissues and organs, has largely been ignored. While practical issues such as difficulty in handling, processing, and slippage offer complexities in characterization, the breakdown of the fundamental assumptions of linear elastic fracture mechanics due to large strains prior to failure, significant energy dissipation ahead of a crack tip and rate and time dependent effects makes understanding of failure in soft materials even more …
Cavitation And Puncture For Mechanical Measurement Of Soft Solids, Sami Fakhouri
Cavitation And Puncture For Mechanical Measurement Of Soft Solids, Sami Fakhouri
Doctoral Dissertations
Gels and other soft elastic networks are a ubiquitous and important class of materials whose unique properties enable special behavior, but generally elude characterization due to the inherent difficulty in manipulating them. This work focuses on understanding and utilizing large, local deformation and failure in soft solids for characterization of the mechanical properties of otherwise inaccessible or nonmanipulable materials. Cavitation Rheology (CR), a pioneering mechanical measurement technique in this regard, where local material failure is imposed and monitored at the tip of a pressurized needle, serves a central role in this thesis. First, CR is used to make in vivo …