Search Results - "Hartmaier, Alexander"

Data-Oriented Constitutive Modeling of Plasticity in Metals by Hartmaier, Alexander

“…Constitutive models for plastic deformation of metals are typically based on flow rules determining the transition from elastic to plastic response of a…”
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Elucidating the dual role of grain boundaries as dislocation sources and obstacles and its impact on toughness and brittle-to-ductile transition by Reiser, Jens, Hartmaier, Alexander

“…In this paper, we resolve the role of grain boundaries on toughness and the brittle-to-ductile transition. On the one hand, grain boundaries are obstacles for…”
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Depth-sensing ductile and brittle deformation in 3C-SiC under Berkovich nanoindentation by Zhao, Liang, Zhang, Junjie, Pfetzing, Janine, Alam, Masud, Hartmaier, Alexander

“…The interplay between ductile and brittle deformation modes in hard brittle materials exhibits a strong size effect. In the present work, indentation…”
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Influence of misfit stresses on dislocation glide in single crystal superalloys: A three-dimensional discrete dislocation dynamics study by Gao, Siwen, Fivel, Marc, Ma, Anxin, Hartmaier, Alexander

“…In the characteristic γ/γ′ microstructure of single crystal superalloys, misfit stresses occur due to a significant lattice mismatch of those two phases. The…”
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The brittle-to-ductile transition in cold-rolled tungsten sheets: the rate-limiting mechanism of plasticity controlling the BDT in ultrafine-grained tungsten by Bonnekoh, Carsten, Reiser, Jens, Hartmaier, Alexander, Bonk, Simon, Hoffmann, Andreas, Rieth, Michael

“…Conventionally produced tungsten (W) sheets are brittle at room temperature. In contrast to that, severe deformation by cold rolling transforms W into a…”
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A machine learning constitutive model for plasticity and strain hardening of polycrystalline metals based on data from micromechanical simulations by Shoghi, Ronak, Hartmaier, Alexander

“…Abstract Machine learning (ML) methods have emerged as promising tools for generating constitutive models directly from mechanical data. Constitutive models…”
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Experimental investigation of laser surface texturing and related biocompatibility of pure titanium by Li, Haoyu, Wang, Xin, Zhang, Junjie, Wang, Binyu, Breisch, Marina, Hartmaier, Alexander, Rostotskyi, Igor, Voznyy, Vyacheslav, Liu, Yu

“…While pure titanium is a material of choice for medical applications for its excellent mechanical and chemical properties, further improving its…”
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Inverse Method to Determine Parameters for Time-Dependent and Cyclic Plastic Material Behavior from Instrumented Indentation Tests by Sajjad, Hafiz Muhammad, Chudoba, Thomas, Hartmaier, Alexander

“…Indentation is a versatile method to assess the hardness of different materials along with their elastic properties. Recently, powerful approaches have been…”
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Thermal softening-suppressed inter-granular embrittlement of polycrystalline 3C-SiC under diamond cutting by Zhao, Liang, Zhang, Jianguo, Fu, Yufan, Zhang, Junjie, Hartmaier, Alexander, Sun, Tao

“…The transition of material removal mode of polycrystalline 3C-SiC cutting with temperature, i.e., from brittle mode cutting that is dominated by inter-granular…”
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Optimal Data-Generation Strategy for Machine Learning Yield Functions in Anisotropic Plasticity by Shoghi, Ronak, Hartmaier, Alexander

“…Trained machine learning (ML) algorithms can serve as numerically efficient surrogate models of sophisticated but numerically expensive constitutive models of…”
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Atomistically informed crystal plasticity model for body-centered cubic iron by Koester, Aenne, Ma, Anxin, Hartmaier, Alexander

“…The glide of screw dislocations with non-planar dislocation cores dominates the plastic deformation behavior in body-centered cubic iron. This yields a strong…”
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Topic Review: Application of Raman Spectroscopy Characterization in Micro/Nano-Machining by Xu, Zongwei, He, Zhongdu, Song, Ying, Fu, Xiu, Rommel, Mathias, Luo, Xichun, Hartmaier, Alexander, Zhang, Junjie, Fang, Fengzhou

“…The defects and subsurface damages induced by crystal growth and micro/nano-machining have a significant impact on the functional performance of machined…”
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Robust Optimization Scheme for Inverse Method for Crystal Plasticity Model Parametrization by Shahmardani, Mahdieh, Vajragupta, Napat, Hartmaier, Alexander

“…A bottom-up material modeling based on a nonlocal crystal plasticity model requires information of a large set of physical and phenomenological parameters…”
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Numerical simulation of materials-oriented ultra-precision diamond cutting: review and outlook by Zhao, Liang, Zhang, Junjie, Zhang, Jianguo, Dai, Houfu, Hartmaier, Alexander, Sun, Tao

“…Abstract Ultra-precision diamond cutting is a promising machining technique for realizing ultra-smooth surface of different kinds of materials. While…”
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Mechanisms of grain boundary softening and strain-rate sensitivity in deformation of ultrafine-grained metals at high temperatures by Ahmed, Naveed, Hartmaier, Alexander

“…Two-dimensional dislocation dynamics and diffusion kinetics simulations are employed to study the different mechanisms of plastic deformation of…”
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Pair vs many-body potentials: Influence on elastic and plastic behavior in nanoindentation of fcc metals by Ziegenhain, Gerolf, Hartmaier, Alexander, Urbassek, Herbert M.

“…Molecular-dynamics simulation can give atomistic information on the processes occurring in nanoindentation experiments. In particular, the nucleation of…”
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Continuum simulation of the evolution of dislocation densities during nanoindentation by Engels, Philipp, Ma, Anxin, Hartmaier, Alexander

“…► Non-local crystal plasticity model suited for initially dislocation-free materials. ► Discrimination between statistically stored and geometrically necessary…”
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In situ investigation of nanometric cutting of 3C-SiC using scanning electron microscope by Tian, Dongyu, Xu, Zongwei, Liu, Lei, Zhou, Zhanqi, Zhang, Junjie, Zhao, Xuesen, Hartmaier, Alexander, Liu, Bing, Song, Le, Luo, Xichun

“…Experimentally revealing the nanometric deformation behavior of 3C-SiC is challenging due to its ultra-small feature size for brittle-to-ductile transition. In…”
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Hydrogen Embrittlement at Cleavage Planes and Grain Boundaries in Bcc Iron-Revisiting the First-Principles Cohesive Zone Model by Guzmán, Abril Azócar, Jeon, Jeongwook, Hartmaier, Alexander, Janisch, Rebecca

“…Hydrogen embrittlement, which severely affects structural materials such as steel, comprises several mechanisms at the atomic level. One of them is hydrogen…”
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Micromechanical Modeling of AlSi10Mg Processed by Laser-Based Additive Manufacturing: From as-Built to Heat-Treated Microstructures by Nammalvar Raja Rajan, Aravindh, Krochmal, Marcel, Wegener, Thomas, Biswas, Abhishek, Hartmaier, Alexander, Niendorf, Thomas, Moeini, Ghazal

“…The unique microstructure of the alloy AlSi10Mg produced by the laser-based powder bed fusion of metals (PBF-LB/M) provides high-strength and…”
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