Shmuel Osovski

Shmuel Osovski
Technion - Israel Institute of Technology | technion · Faculty of Mechanical Engineering

About

66
Publications
13,982
Reads
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1,216
Citations
Citations since 2017
48 Research Items
1017 Citations
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Additional affiliations
October 2012 - July 2014
University of North Texas
Position
  • PostDoc Position
Education
June 2009 - April 2013
Technion - Israel Institute of Technology
Field of study
  • Mechanical Eng.
March 2004 - March 2006
September 1999 - March 2004
Technion - Israel Institute of Technology
Field of study
  • Materials Eng.

Publications

Publications (66)
Article
Since the discovery of the M7C3-type carbide in 1935, it has been the subject of many studies owing to it extensive usage in wear sensitive applications. Despite the technological importance of (Cr,Fe)7C3 carbides, attempts at using computational methods for tailoring its growth characteristics, stability and mechanical properties are hindered by t...
Article
Modern computer vision and machine learning techniques, when applied in Fractography bare the potential to automate much of the failure analysis process and remove human induced ambiguity or bias. Given the complex interaction between intrinsic (e.g. microstructure) and extrinsic (e.g. environment, loading history) factors leading to failure, deep...
Article
We introduce a novel computational framework designed to allow an experimentalist to extract the local toughness associated with crack growth along an individual grain boundary from fracture experiments on standard specimens. The proposed framework relies on the ability of a graph neural network to perform high accuracy predictions of the micro-sca...
Preprint
We introduce a novel machine learning computational framework that aims to compute the material toughness, after subjected to a short training process on a limited meso-scale experimental dataset. The three part computational framework relies on the ability of a graph neural network to perform high accuracy predictions of the micro-scale material t...
Article
The implementation of additive manufacturing techniques in the production of mission critical structural components is challenged by its low throughput and limited build envelope. In recent years, hybrid production methods are emerging to bridge between the build volume and high throughput of conventional production methods and the design freedom e...
Article
Full-text available
Magnesium alloys are primarily associated with complex forming mechanisms, which yield ductility at high temperatures. In sheet metal forming, high triaxiality stress states that favor the ductile damage mechanisms of void formation and growth are known to malleable metals. The formulation of coupled damage models has so far failed, due to the inco...
Article
Full-text available
The AlCrFe2Ni2 high entropy alloy exhibits an interesting microstructure, which changes considerably when various thermal treatments are applied. These changes are manifested mostly through the precipitation and dissolution of several BCC and FCC phases. To gain better understanding as to the phase evolution in AlCrFe2Ni2 with respect to the therma...
Article
Full-text available
The alloy system Al-(Co)-Cr-Fe-Ni contains compositional ranges where a solid state BCC-FCC phase transformation leads to dual-phase materials composed of face-centered cubic (FCC) and body-centered cubic (BCC) phases with nearly equal volume fraction. The microstructure arising from this transformation at slow cooling rates is the classical Widman...
Preprint
The implementation of additive manufacturing techniques in the production of mission critical structural components is challenged by its low throughput and limited build envelope. In recent years, hybrid production methods are emerging to bridge between the build volume and high throughput of conventional production methods and the design freedom e...
Preprint
Full-text available
Dynamic fracture tests are carried out for four groups of hole-containing edge loaded specimens. The crack growth velocity, crack path, and dynamic toughness are extracted from the experiments using high-speed photography and digital image correlation. The importance of the interaction between the in-coming stress wave and the pre-existing hole is...
Article
Full-text available
Damage evolution in two types of shear-dominant quasi-statically loaded specimens, with a single spherical pore embedded at their mid-gauge section, is analyzed numerically. The evolving damage in those geometrically identical specimens is characterized using the Gurson-Tvergaard-Needleman (GTN) model accounting for nucleation and growth of porosit...
Article
Full-text available
The methodology used to measure transient temperature changes in impacted solids, using high-speed infrared detectors, is presented and discussed thoroughly. The various steps leading to a reliable measurement, namely selection of the sensing device, calibration of the setup, interfacing with the impact apparatus (Kolsky bar), and data reduction ar...
Preprint
Modern computer vision and machine learning techniques, when applied in Fractogra- phy bare the potential to automate much of the failure analysis process and remove human induced ambiguity or bias. Given the complex interaction between intrinsic (e.g. microstructure) and extrinsic (e.g. environment, loading history) factors leading to failure, dee...
Article
Full-text available
The science of fractography revolves around the correlation between topographic characteristics of the fracture surface and the mechanisms and external conditions leading to their creation. While being a topic of investigation for centuries, it has remained mostly qualitative to date. A quantitative analysis of fracture surfaces is of prime interes...
Article
Full-text available
The dimpled fracture surfaces observed in a post-mortem investigation of the ductile fracture indicates that the fracture formed through coalescing voids that originated at the microstructural level. The damage process is commonly described by the nucleation and growth of those voids, thinning the inter-void material ligaments, ultimately leading t...
Preprint
The onset of macroscopic strain localization limits the ductility of many ductile materials. For porous ductile materials, two distinct mechanisms of macroscopic localization have been identified: void growth induced softening and void coalescence. In this work we focus on analyzing the influence of material's strain rate sensitivity (SRS) on the t...
Preprint
A model based on discrete unit events coupled with a graph search algorithm is developed to predict intergranular fracture. The model is based on two hypotheses: (i) the key unit event associated with intergranular crack propagation is the interaction of a grain boundary crack with a grain boundary segment located at an angle with the initial crack...
Preprint
The influence of grain size distribution on ductile intergranular crack growth resistance is investigated using full-field microstructure-based finite element calculations and a simpler model based on discrete unit events and graph search. The finite element calculations are carried out for a plane strain slice with planar grains subjected to mode...
Preprint
The objective is to identify the micromechanism(s) of ductile crack advance, and isolatethe key microstructural and material parameters that a?ect these micromechanisms andfracture toughness of ductile structural materials. Three dimensional, ?nite element, ?nitedeformation, small scale yielding calculations of mode I crack growth are carried out f...
Preprint
Fracture toughness of a material depends on its microstructure and the imposed loading conditions. Intuitively, the resultant fracture surfaces must contain the information about the interlacing of these intrinsic (microstructure) and extrinsic (imposed loading) characteristics. Mandelbrot’s revelation that fracture surfaces are fractals, excited b...
Article
Full-text available
Heat dissipation still remains an unsolved problem in dynamic plasticity, where nearly adiabatic conditions prevail during high-rate loading scenarios. It is well known that the mechanical energy that is not dissipated as heat during material straining remains stored in the lattice as microstructural defects, and thus, a one-to-one relationship can...
Preprint
Full-text available
Heat dissipation still remains an unsolved problem in dynamic plasticity, where nearly adia-batic conditions prevail during high-rate loading scenarios. It is well known that the mechanical energy that is not dissipated as heat during material straining remains stored in the lattice as mi-crostructural defects, and thus a one-to-one relationship ca...
Article
Full-text available
Ductile fracture is a process involving microvoids nucleation and growth, ending abruptly by void coalescence. The nature of the local mechanical fields is of prime importance to model the fracture process, and those have been widely studied, generally assuming plane strain or axisymmetric conditions. We suggest that the void surroundings and the i...
Article
The influence of grain size distribution on ductile intergranular crack growth resistance is investigated using full field microstructure-based finite element calculations and a simpler model based on discrete unit events and graph search. The finite element calculations are carried out for a plane strain sheet with planar grains subjected to mode...
Article
Full-text available
Fracture toughness of a material depends on its microstructure and the imposed loading conditions. Intuitively, the resultant fracture surfaces must contain the information about the interlacing of these intrinsic (microstructure) and extrinsic (imposed loading) characteristics. Mandelbrot’s revelation that fracture surfaces are fractals, excited b...
Article
The onset of macroscopic strain localization limits the ductility of many ductile materials. For porous ductile materials, two distinct mechanisms of macroscopic localization have been identified: void growth induced softening and void coalescence. In this work we focus on analyzing the influence of material's strain rate sensitivity (SRS) on the t...
Preprint
Full-text available
The science of fractography revolves around the correlation between topographic characteristics of the fracture surface and the mechanisms and external conditions leading to their creation. While being a topic of investigation for centuries, it has remained mostly qualitative to date. A quantitative analysis of fracture surfaces is of prime interes...
Article
Single-walled carbon nanotubes (SWCNTs) have excellent intrinsic mechanical properties and would not suffer from inter-layer sliding as their multi-walled counterparts, making them promising reinforcing candidates for advanced metal matrix composites. In this study, we fabricated nanolaminated SWCNT-aluminum (Al) composites where the SWCNTs were un...
Article
Graphene is considered to be an ideal reinforcement in metals, and its strengthening to the metal matrix is found to be the combined effect of load-sharing and the alteration of dislocation activity in the matrix. In this study, uniaxial compression tests were performed on graphene (reduced graphene oxide, RGO)-Al nanolaminated composite micro-pill...
Article
The objective is to identify the micromechanisms of ductile crack advance, and isolate the key microstructural and material parameters that affect these micromechanisms and fracture toughness of ductile structural materials. Three dimensional, finite element, finite deformation, small scale yielding calculations of mode I crack growth are carried o...
Article
Full-text available
The aim of this study is to analyze the overall mechanical behavior of such material when subjected to shear deformation. Two-dimensional finite element calculations on a material containing a periodic array of pressurized voids are used for this analysis. It was found that with increasing internal pressure, the void’s shape tends to remain ellipti...
Article
Full-text available
A model based on discrete unit events coupled with a graph search algorithm is developed to predict intergranular fracture. The model is based on two hypotheses: (i) the key unit event associated with intergranular crack propagation is the interaction of a grain boundary crack with a grain boundary segment located at an angle with the initial crack...
Article
Full-text available
Materials and construction methods of nests vary between bird species and at present, very little is known about the relationships between architecture and function in these structures. This study combines computational and experimental techniques to study the structural biology of nests fabricated by the edible nest swiftlet Aerodramus fuciphagus...
Article
Uniaxial tensile tests were carried on graphene (reduced graphene oxide, RGO)–Al laminated composites with Al lamella thicknesses varying from 1 μm down to 200 nm. It was found that there was a transition in plastic deformation mechanism, from a Hall–Petch-typed mechanism at 500 nm and 1 μm Al lamella thicknesses, to confined layer slip (CLS) of di...
Article
We conducted in situ microtension experiments in a scanning electron microscope (SEM) to study the orientation-dependent mechanical behavior of nanolaminated graphene-Al composite. We found a transition from a weak-and-brittle behavior in the isostress composite configuration to a strong-yet-ductile tensile response in the composite under isostrain...
Poster
Full-text available
Arterial constitutive models facilitate an appropriate interpretation of the mechanical properties. The mechanical properties of arteries provide insight into the structure and function of the tissue, enable pathologies identification, improve clinical intervention techniques, and guide design of stents and grafts. Stress-free state geometrical par...
Article
Despite major advances made in modeling vascular tissue biomechanics, the predictive power of constitutive models is still limited by uncertainty of the input data. Specifically, key measurements, like the geometry of the stress-free (SF) state, involve a definite, sometimes non-negligible, degree of uncertainty. Here, we introduce a new approach f...
Article
Full-text available
Dislocation-based constitutive models are widely used to predict the plastic behavior of metallic materials, in both quasi-static and dynamic conditions. In addition, if the ratio of (adiabatic) thermomechanical (plastic work to heat) conversion is known, the stress-strain-temperature relationship can be estimated. The main purpose of this study wa...
Article
Full-text available
Stress wave loaded specimens are extensively used to study the dynamic fracture of a variety of materials. Various geometries can be found in the literature, each having its advantages and disadvantages. The majority of the available specimens are lacking the ability to propagate long cracks under pure mode I. Here, we present a newly developed spe...
Article
At high strain rates, the fragmentation of expanding structures of ductile materials, in general, starts by the localization of plastic deformation in multiple necks. Two distinct mechanisms have been proposed to explain multiple necking and fragmentation process in ductile materials. One view is that the necking pattern is related to the distribut...
Article
Full-text available
The goal of this paper is to predict how the properties of the constituent phases and microstructure of dual phase steels (consisting of ferrite and martensite) influence their fracture resistance. We focus on two commercial low-carbon dual-phase (DP) steels with different ferrite/martensite phase volume fractions and properties. These steels exhib...
Article
Full-text available
The efficiency of the thermomechanical conversion, expressed as the Taylor–Quinney coefficient (TQC) is seldom reported in the literature and generally assumed to be equal to 0.9. Moreover, an eventual dependence of this coefficient on the dynamic loading mode has not been investigated so far. This work presents a systematic characterization of the...
Article
Dynamic failure of impact-loaded structures is often caused by dynamic shear localization, that is also known as adiabatic shear banding (ASB). While ASB has long been thought to be triggered by thermal softening, another potent softening mechanism has been recently identified in which islands of dynamically recrystallized nanograins nucleate and c...
Article
Full-text available
Adiabatic shear banding (ASB) is a unique dynamic failure mechanism that results in an unpredicted catastrophic failure due to a concentrated shear deformation mode. It is universally considered as a material or structural instability and as such, ASB is hardly controllable or predictable to some extent. ASB is modeled on the premise of stability a...
Article
We explore the possibility of engineering the crack path by controlling a material's microstructure in order to increase its crack growth resistance. Attention is confined to a specific type of microstructure that is encountered in a variety of structural metals and alloys - second phase particles distributed in a ductile matrix. The type of contro...
Article
Ductile crack growth in a grain boundary layer is modeled under mode I plane-strain, small-scale yielding conditions. The calculations are carried out for planar polycrystals using an elastic–viscoplastic constitutive relation for a progressively cavitating solid with two populations of void nucleating second-phase particles. The material propertie...
Article
Recent experimental work has revealed that necking of tensile specimens, subjected to dynamic loading, is a deterministic phenomenon, governed by the applied boundary conditions. Furthermore it was shown that the potential sited, dictated by the boundary conditions, may prevail even in the presence of a notch, thus necking may occur away of the not...
Article
This paper examines the effects of sample size and boundary conditions on the necking inception and development in dynamically stretched steel specimens. For that task, a coordinated systematic experimental-numerical work on the dynamic tensile test has been conducted. Experiments were performed using a tensile Kolsky apparatus for impact velocitie...
Article
Full-text available
Three dimensional calculations of ductile crack growth under mode I plane strain, small scale yielding conditions are carried out using an elastic-viscoplastic constitutive relation for a progres- sively cavitating plastic solid with two populations of void nucleating second phase particles. Full field solutions are obtained for three dimensional m...
Article
Dynamic shear localization attracted interest as both experimental and theoretical evidence suggested that its origins are not only due, as believed, to thermal softening, but are most likely related to microstructural evolutions, the latter being driven by a critical value of the stored strain energy. Yet, nothing is known about the effects of the...
Article
The dynamic stored energy of cold work (SECW) has recently been identified as the trigger for adiabatic shear failure. However, the question of what makes the failure "dynamic" has remained open so far. Using compression tests (Ti6A14V alloy) over a wide range of strain rates [10(-4)-10(4) s(-1)], we have identified a transition strain rate above w...
Article
Dynamic recrystallization (DRX), driven by the dynamic stored energy of cold work, promotes shear localization. However, the influence of twinning remains to be investigated. We consider two model materials under impact, pure Titanium and a Ti6Al4V alloy, for which the extent of twinning and DRX differs vastly. A grain-scale finite element model sh...
Article
Full-text available
This paper addresses adiabatic shear localization from a different point of view. New results are reviewed which indicate that the process can be viewed as triggered by dynamic recrystallization instead of being the result of thermal softening as universally assumed. A simple dislocation dynamics model (modified ETMB) is used to reproduce the salie...
Article
Full-text available
The recent pioneering experiments of the Nature 412 52 (2001)] and Science 293 274 (2001)] groups have demonstrated the dynamical tunneling of cold atoms interacting with standing electromagnetic waves. It has been shown [ Phys. Rev. Lett. 89 253201 (2002)], that the tunneling oscillations observed in these experiments correspondingly stems from tw...
Article
Full-text available
Two recent experiments have demonstrated the phenomenon of dynamical tunneling of cold atoms interacting with standing electromagnetic waves. We show by quantitative calculations that one can achieve a control of the tunneling period over an orders of magnitude range by changing the frequency difference of the waves by about 10% only. In this narro...

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Projects

Projects (6)
Project
Gyroid structures are commonly found in nature due to the high strength to weight ratio and the isotropic properties. The lattice structure is numerically analysed to develop the yield surface.
Project
The research examines the influence of the operating parameters on the formability of ASTM A992 steel using GTN model embedded in finite element analysis to improve the formability of the material under environments. Effect of the strain rate, temperature, shear load and friction are considered as the operating variables to analyse the evolution of the FLC.
Project
Behavior of soft interface under different strain rates are studied on 3D printed specimens. This is a collaboration with Dr. Stephan Rudykh and Dr. Slava from Technion-IIT. A reverse tapered triangular specimen is designed with a soft interface using 3D printer. The specimens are tested under quasi-static and dynamic loading to evaluate the influence of the strain rate on the fracture. Interfaces at several angles are introduced to examine the fracture characteristics. Numerical analysis with finite element method is to confirms the generalities.