2026-09-20T18:53:33Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/16010 2023-07-10 col_2142_14770 col_2142_5131 com_2142_3518 com_2142_234 com_2142_5130

en Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2012-05-19T10:00:18Z Paulino, Glaucio H. Gain, Arun 2010-05-18T18:56:02Z 2010-05-18T18:56:02Z 2012-05-19T10:00:18Z 2010-05-18T18:56:02Z Current work utilizes cohesive zone modeling to study the fracture properties of metals. This study proposes a hybrid technique experimental/numerical to extract cohesive fracture properties of elasto-plastic material using inverse analysis and digital image correlation. Two approaches are suggested - a shape optimization technique and a parameter optimization for the PPR potential-based cohesive zone model. In shape optimization approach, CZM is obtained by piecewise interpolation of the optimized interpolation points whereas in parameter optimization for the PPR potential-based CZM, the CZM is obtained by using the PPR model which utilized the parameters coming from an optimization scheme. Unconstrained, derivative free Nelder-Mead scheme is used for optimization purpose. The bulk material is modeled as plane-stress J2 plastic material. The proposed schemes are verified for various plausible cases, such as different displacement field data, various initial guess and noisy displacement field data. As a proof of concept, both schemes are applied to Polymethyl Methacrylate (PMMA) quasistatic crack growth experiment, which is modeled as elastic material, to substantiate its utility. Near tip displacement field is obtained experimentally using DIC and used as input to the optimization schemes. Computationally predicted global responses of the PMMA specimen, using the CZMs extracted from the inverse analysis, shows good agreement with the experimental global response. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-16T15:04:00Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 gain_arun.pdf: 3078515 bytes, checksum: 460254b669d321619eada9e77eff8fda (MD5) Made available in DSpace on 2010-05-18T18:56:02Z (GMT). No. of bitstreams: 3 gain_arun.pdf: 3078515 bytes, checksum: 460254b669d321619eada9e77eff8fda (MD5) 1_gain_arun.pdf: 3078954 bytes, checksum: 5207abd93b9887950aee357f34c9daa2 (MD5) license.txt: 4056 bytes, checksum: 990c3830613143e8fbf9fc8b5fa78a45 (MD5) Item marked as restricted to the 'Administrator' Group (id=1) by William Ingram (wingram2@illinois.edu) on 2010-05-18T18:56:44Z Item is restricted until 2012-05-18T18:56:42Z Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2012-05-19T10:00:18Z Item was in collections: Dissertations and Theses - Civil and Environmental Engineering (ID: 672) University of Illinois Dissertations and Theses (ID: 204) No. of bitstreams: 3 gain_arun.pdf: 3078515 bytes, checksum: 460254b669d321619eada9e77eff8fda (MD5) 1_gain_arun.pdf: 3078954 bytes, checksum: 5207abd93b9887950aee357f34c9daa2 (MD5) license.txt: 4056 bytes, checksum: 990c3830613143e8fbf9fc8b5fa78a45 (MD5) http://hdl.handle.net/2142/16010 Copyright 2010 Arun Lal Gain cohesive zone model inverse analysis Park-Paulino-Roesler model (PPR) Nelder-Mead scheme A hybrid technique to extract cohesive fracture properties of elasto-plastic materials using inverse analysis and digital image correlation 2010-5 Civil & Environmental Eng 1251 Civil Engineering 0106 University of Illinois at Urbana-Champaign Thesis M.S. MS:Civil Engineering -UIUC 10KS0106MS