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2019-01-01
Amirian, B., Li, H.Y., Hogan, James D.
In this paper, a microstructure-based finite element model for nano-grained (!+↵2)-TiAl/Al2O3 cermets is proposed based on a modified variational formulation of the Gurson model for an elastic-plastic porous material. In the modeling approach, the high volume fraction of alumina, variability in...
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2020-07-01
Lo, Calvin, Sano, Tomoko, Hogan, James D.
We investigated the uniaxial compressive behavior of damaged and intact alumina using quantitative X-ray computed tomography (XCT) analysis coupled with digital image correlation (DIC) for mechanical characterization. Internal three-dimensional crack characteristics such as crack surface area and...
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Microstructural and mechanical characterization of variability in porous advanced ceramics using X-ray computed tomography and digital image correlation.
Download2019-01-01
Lo, Calvin, Sano, Tomoko, Hogan, James D.
This paper explores microstructural and mechanical variability in porous ceramics, combining advanced X-ray computed tomography (XCT) and digital image correlation (DIC) techniques to characterize an alumina material. The results show low variability in microstructure, with median pore size...
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On the evaluation of mechanical properties and ballistic performance of two variants of boron carbide
Download2021-06-01
Lo, Calvin, Li, Haoyang, Toussaint, Geneviève, Hogan, James D.
A comparative study on the microstructure, rate-dependent compressive behavior, and ballistic performance of commercially available pressureless sintered boron carbide-titanium diboride (material Z) and hot-pressed boron carbide (material S) was conducted. Under quasi-static compression at rates...
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On the Rate-dependency of Mechanical Properties and Failure Mechanisms of a (γ + α2) - TiAl/Ti3Al-Al2O3 Cermet
Download2020-07-01
Li, Haoyang, Motamedi, Pouyan, Hogan, James D.
This study investigated the rate-dependent mechanical properties and failure of a self-propagating high-temperature synthesized TiAl/Ti3Al-Al2O3 cermet using mechanical testing and advanced microscopy. Quasi-static and dynamic uniaxial compression tests coupled with high-speed imaging and digital...
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The mechanical response of a α2 (Ti3Al)+ γ (TiAl)-submicron grained Al2O3 cermet under dynamic compression: Modeling and experiment.
Download2019-01-01
Amirian, B., Li, H.Y., Hogan, James D.
Novel experimental data, obtained using an advanced digital image correlation technique coupled to ultra-high-speed photography, have been used to develop and validate a microstructure-dependent constitutive model for a α2(Ti3Al) + γ(TiAl)-submicron grained Al2O3 cermet. Utilizing experimental...