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Ductile Fracture Behavior of a Nickel-Based Superalloy and Thermally-Induced Strain Behavior of an Aluminum Alloy

Smith, Jarrod Lee
http://rave.ohiolink.edu/etdc/view?acc_num=osu1428427838

Abstract Details

2015, Master of Science, Ohio State University, Mechanical Engineering.
The objective of this research is to generate experimental data that can be used to calibrate and validate constitutive models for plastic deformation and failure that are implemented in numerical simulations. In the first part of the research, tension tests are conducted at elevated temperatures on notched and unnotched thin flat specimens made of a nickel-based superalloy. The geometry of each sample is designed to induce various states of stress inherent in original jet engine components. Three-dimensional Digital Image Coorelation (3D-DIC) is used to measure the full-field deformations. The results of these tests show the setup is successful in capturing displacements and strains on the surface of each sample at elevated temperatures for ductile materials. The force versus displacement curves reveal that the nickel-based superalloy being tested exhibits thermal softening and serrated flow due to strain localizations at elevated temperatures. The second part of the research introduces a method to characterize the thermally induced strain behavior of a 6000 series aluminum alloy during the car manufacturing process. To simulate the stamping process, dogbone and rectangular strip specimens are subject to uniaxial and bending strains. A method for measuring strains on the surface of specimens during bend tests is established. Following deformation, specimens are subjected to thermal heating cycles that simulate the paint-bake cycle. The thermally iii induced strains during the heating cycle are measured for the each of the specimens. In addition, the material properties and thermal buckling behavior of the aluminum at various temperatures are investigated. The results show that specimens subject to different bending strains display elevated coefficients of thermal expansion and residual strain after being rendered to a heating cycle. The measurements from the material property and thermal buckling testing can be used to calibrate a thermally dependent material model.
Amos Gilat (Advisor)
Brian Harper (Committee Member)
117 p.
Mechanical Engineering
Ductile Fracture; Nickel-Based Superalloy; Strain; DIC; 3D-DIC; Thermal Behavior; Serrated Flow

Recommended Citations

Citations

  • Smith, J. L. (2015). Ductile Fracture Behavior of a Nickel-Based Superalloy and Thermally-Induced Strain Behavior of an Aluminum Alloy [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428427838

    APA Style (7th edition)

  • Smith, Jarrod. Ductile Fracture Behavior of a Nickel-Based Superalloy and Thermally-Induced Strain Behavior of an Aluminum Alloy. 2015. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1428427838.

    MLA Style (8th edition)

  • Smith, Jarrod. "Ductile Fracture Behavior of a Nickel-Based Superalloy and Thermally-Induced Strain Behavior of an Aluminum Alloy." Master's thesis, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428427838

    Chicago Manual of Style (17th edition)

osu1428427838
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This open access ETD is published by The Ohio State University and OhioLINK.