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Thesis The Fracture Mechanic

Application of dynamic fracture mechanics to the

SciTech Connect Thesis/Dissertation: Fracture-mechanics studies of cementitious composites Title: Fracture-mechanics studies of cementitious composites. Attempts have been made to apply fracture mechanics to concrete. However, the experimentally observed fracture parameters for concrete were found to be dependent on specimen size. A failure envelope,., based on the failure model and finite element analysis, is presented for the different cases and the implications for the residual strength of aircraft structures is discussed. Mixed mode dynamic crack initiation in aluminum 2024-T3 alloy is investigated by combining experiments with numerical simulations. (advisor) Ravichandran, Guruswami (advisor) Thesis Committee: Unknown, Unknown Defense Date: Record Number: CaltechETD:etd. Persistent URL: ltech. edu/CaltechETD:etd Default Usage Policy: No commercial reproduction, distribution, display or performance rights in this work are provided. The fracture surfaces near the crack initiation site are investigated using a scanning electron microscope and reveal ductile void growth and coalescence. Numerical simulations of the experiments are conducted to both help in designing the experiments and to validate the results of the experiments.

Resource Relation: Other Information: Thesis (Ph. D.) Publisher: Northwestern Univ.,Evanston, IL Research Org: Northwestern Univ., Evanston, IL (USA) Country of Publication: United States Language: English Subject: 36 MATERIALS SCIENCE ; COMPOSITE MATERIALS ; FRACTURE PROPERTIES ; CONCRETES ; REINFORCED MATERIALS ; CRACK PROPAGATION ; FIBERS ; SIZE ; BUILDING MATERIALS ; MATERIALS ; MECHANICAL PROPERTIES Materials- Properties.

This thesis first addresses studies of size effect on fracture parameters. Following the size-effect studies, applications of the fracture mechanics to concrete and steel-fiber-reinforced concrete are developed. An experimental program is first designed to investigate the factors that cause the size-effect on the fracture parameters used for concrete. The fracture parameters studied are critical stress intensity factor, critical strain energy release rate, critical crack tip opening displacement and fracture energy. The pre-critical stable crack growth is found to be the major factor that causes the size effect on the conventional critical stress intensity factor. The dynamic mixed mode failure envelope is obtained using the crack initiation data from the experiments at a nominal loading rate of. and is compared with the static counterpart for 2024-T3 aluminum alloy. Resource Relation: Other Information: Thesis (Ph. D.) Publisher: Northwestern Univ.,Evanston, IL Research Org: Northwestern Univ., Evanston, IL (USA) Country of Publication: United States Language: English Subject: 36 MATERIALS SCIENCE ; COMPOSITE MATERIALS ; FRACTURE PROPERTIES ; CONCRETES ; REINFORCED MATERIALS ; CRACK PROPAGATION ; FIBERS ; SIZE ; BUILDING MATERIALS ; MATERIALS ; MECHANICAL PROPERTIES Materials- Properties. Some links on this page may take you to non-federal websites. Their policies may differ from this site. A methodology to determine residual strength of dynamically loaded structures based on global structural analysis coupled with local finite element analysis is introduced. Local finite element calculations were performed for different loading rates,., ranging from. SciTech Connect Thesis/Dissertation: Fracture-mechanics studies of cementitious composites Title: Fracture-mechanics studies of cementitious composites. Attempts have been made to apply fracture mechanics to concrete. However, the experimentally observed fracture parameters for concrete were found to be dependent on specimen size. The numerical simulations show good correlation with the experimental results. Item Type: Thesis (Dissertation (Ph. D.) Degree Grantor: California Institute of Technology. Division: Engineering and Applied Science Major Option: Aeronautics Thesis Availability: Restricted to Caltech community only Research Advisor(s Rosakis, Ares J. A drop of up to 40 in the value of dynamic initiation toughness,., is discovered for loading rates in the range of. This range of loading rate corresponds to the typical rates found in an aircraft fuselage experiencing explosive loading conditions. Have you considered publishing an updated version of your autobiography at some point in your life? Yanni: I think that the time will come in the near future for me to share the changes and new lessons learned over the past decade. Iraqi Troops Rescued by Helicopter After Ramadi Falls to ISIS. Malaysia Government Says 2 More Pieces 'Almost Certainly' From MH370. North Korea Celebrates With Colorful Parade. Nightline : 'Sextortion' Becomes Growing Online Global Threat. Hyundai and Kia continue to make reliable cars. The Hyundai Elantra and Tucson, and the Kia Sportage get top marks. The new Hyundai Genesis V6 is better than average; the V8 version is average. Simon Garfunkel also were strongly influenced by the Everlys and recorded live versions of "Bye Bye Love" and "Wake Up Little Susie.". The brothers pursued solo careers beginning in the early '70s, though Don obtained the lion's share of the chart success at first. Based on the observation of experimental results, the critical stress intensity factor and critical crack-tip opening displacement are proposed as the two basic fracture parameters. A theoretical model is developed for steel-fiber-reinforced concrete.

A drop of up to 40 in the value of dynamic initiation toughness,., is discovered for loading rates in the range of. This range of loading rate corresponds to the typical rates found in an aircraft fuselage experiencing explosive loading conditions.

Fracture mechanics thesis
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