dc.contributor.advisor | Singh, Raman P. | |
dc.contributor.author | Hamim, Salah Uddin Ahmed | |
dc.date.accessioned | 2017-02-22T22:09:25Z | |
dc.date.available | 2017-02-22T22:09:25Z | |
dc.date.issued | 2016-05 | |
dc.identifier.uri | https://hdl.handle.net/11244/48810 | |
dc.description.abstract | Nanoindentation involves probing a hard diamond tip into a material, where the load and the displacement experienced by the tip is recorded continuously. This load-displacement data is a direct function of material's innate stress-strain behavior. Thus, theoretically it is possible to extract mechanical properties of a material through nanoindentation. However, due to various nonlinearities associated with nanoindentation the process of interpreting load-displacement data into material properties is difficult. Although, simple elastic behavior can be characterized easily, a method to characterize complicated material behavior such as nonlinear viscoelasticity is still lacking. In this study, a nanoindentation-based material characterization technique is developed to characterize soft materials exhibiting nonlinear viscoelasticity. Nanoindentation experiment was modeled in finite element analysis software (ABAQUS), where a nonlinear viscoelastic behavior was incorporated using user-defined subroutine (UMAT). The model parameters were calibrated using a process called inverse analysis. In this study, a surrogate model-based approach was used for the inverse analysis. The different factors affecting the surrogate model performance are analyzed in order to optimize the performance with respect to the computational cost. | |
dc.format | application/pdf | |
dc.language | en_US | |
dc.rights | Copyright is held by the author who has granted the Oklahoma State University Library the non-exclusive right to share this material in its institutional repository. Contact Digital Library Services at lib-dls@okstate.edu or 405-744-9161 for the permission policy on the use, reproduction or distribution of this material. | |
dc.title | Parameter estimation of a nonlinear Burger's model using nanoindentation and finite element-based inverse analysis | |
dc.contributor.committeeMember | Kalkan, A. Kaan | |
dc.contributor.committeeMember | Harimkar, Sandip P. | |
dc.contributor.committeeMember | Singh, Raj N. | |
osu.filename | Hamim_okstate_0664D_14673.pdf | |
osu.accesstype | Open Access | |
dc.type.genre | Dissertation | |
dc.type.material | Text | |
thesis.degree.discipline | Mechanical and Aerospace Engineering | |
thesis.degree.grantor | Oklahoma State University | |