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Skip to Search Results- 7Strain rate
- 5Brittle fracture
- 4Dynamic fragmentation
- 4Planetary materials
- 2Brittle materials
- 2Compression
- 5Hogan, James
- 4Rogers, Robert
- 4Spray, John
- 2Bhagavathula, Kapil Bharadwaj
- 2Hogan, James D.
- 2Meredith, Christopher S.
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2016
Lamberson, Leslie, Pagano, Steven, Hogan, James
The rate-dependent compressive response and resulting fragmentation characteristics of dry ox cortical bone and cyanoacrylate-based cortical bone surrogate material was investigated in two material orientations. Tests were conducted under quasi-static (10−3 s−1) and dynamic (103 s−1) loading in...
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Debris Field Kinetics during the Dynamic Fragmentation of Polyphase Natural Ceramic Blocks: Ejecta Measurements and Damage Modes
Download2013
Hogan, James, Schneider, Markus, Rogers, Robert, Spray, John, Vincent, Gregory
The dynamic fragmentation of coarse and fine grained granitoid blocks during impact has been examined for energies of 1.9 kJ to 3.0 kJ and 2.7 kJ to 6.8 kJ, respectively. A particle tracking algorithm was developed to measure ejecta size and velocity at the rear of the target for a horizontal...
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Fall 2014
Ductile and brittle failure behaviors of semi-crystalline polymers such as high density polyethylene (HDPE) were investigated under uni-axial tensile loading at various test conditions. The first part of the thesis examines the influence of aspect ratio of rectangular cross-section on the...
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Density, Microstructure, and Strain‑Rate Effects on the Compressive Response of Polyurethane Foams
Download2021-11-09
Bhagavathula, Kapil Bharadwaj, Meredith, Christopher S., Ouellet, Simon, Satapathy, Sikhanda S., Romanyk, Dan L., Hogan, James D.
Background A better understanding of the efect of density, microstructure, and strain rate on the mechanical response of polymeric foam materials is needed to improve their performance. Objective The objective of this paper is to study the combined infuence of density, microstructure, and...
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Density, strain rate and strain effects on mechanical property evolution in polymeric foams
Download2022-03-01
Bhagavathula, Kapil Bharadwaj, Meredith, Christopher S., Ouellet, Simon, Romanyk, Dan L., Hogan, James D.
This study presents a comprehensive experimental study of the evolution of Poisson’s ratio and tangent modulus of polymeric foams during rate dependant uniaxial compression. In this study, polyurethane foams with densities of 195 kg/m3, 244 kg/m3, and 405 kg/m3 obtained from PORON (XRD series)...
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2015
Ramesh, K. , Plescia, J.B., Hogan, J.D., Mir, C.E.
Improvements in computational and analytical modelling of large-scale impact and catastrophic disruption events will come from a better understanding of the failure processes that are active during high strain-rate events. In this study we investigate the dynamic compressive failure and...
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2012
Hogan, James, Spray, John, Rogers, Robert, Boonsue, Suporn
The dynamic fragmentation of granite at impact energies of 6–28 J is examined in this paper. Results indicate that more dense materials, or those with a higher quartz content, produce less fractured mass, and have larger dominant fragment sizes and smaller aspect ratios in their fragment...
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Dynamic Fragmentation of Planetary Materials: Length Scale Quantification and Semi-Analytical Modelling
Download2013
Rogers, Robert, Spray, John, Hogan, James
The dynamic fragmentation of planetary materials during impact into finite targets has been examined. A particle tracking algorithm was implemented to estimate the size and velocity of fragments ejected from the rear of the target. A total of 76 experiments were performed for four material,...
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Effect of strain rate on tribological properties of pre-deformed alloys via work function analysis
DownloadFall 2018
In industries such as automobile, aerospace and shipping, components made of magnesium and copper alloy could have the chance to bump against other objects during transportation applications. The damage caused by local deformation at high strain rates when other damage processes are involved,...
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Impact Failure of Planetary Materials: Lateral Field Ejecta Measurements using Particle Image Velocimetry
Download2014
Schneider, Markus, Spray, John, Rogers, Robert, Hogan, James, Vincent, Gregory
The dynamic fragmentation of a fine grained granitoid material has been examined. Target thicknesses ranged from 7 to 40 mm and impact energies from 12 to 2,500 J. Combined particle image velocimetry and image enhancement techniques are introduced and have been used to measure the size and...