Jean-Charles Stinville

Jean-Charles Stinville
University of Illinois, Urbana-Champaign | UIUC · Department of Materials Science and Engineering

Eng. Ph.D.

About

118
Publications
43,952
Reads
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3,650
Citations
Additional affiliations
February 2015 - August 2021
University of California, Santa Barbara
Position
  • Specialist
February 2012 - February 2015
University of California, Santa Barbara
Position
  • PostDoc Position
January 2010 - January 2012
École de Technologie Supérieure
Position
  • PostDoc Position

Publications

Publications (118)
Article
A methodology is presented for the use of the oxide scale that develops in polycrystalline Ni-base superalloys at service temperature, as a speckle pattern for μm-scale resolution strain measurements. Quantitative assessment of the heterogeneous strain field at the grain scale is performed by high-resolution SEM digital image correlation under mono...
Article
Damage initiation during cycling loading of polycrystalline metallic alloys involves localized damage at the scale of individual grains. To better understand damage processes and to build models for material behavior, there is a need for quantitative assessment of the microstructural configurations that favor fatigue crack initiation. In materials...
Article
Damage during loading of polycrystalline metallic alloys is localized at or below the scale of individual grains. Quantitative assessment of the heterogeneous strain fields at the grain scale is necessary to understand the relationship between microstructure and elastic and plastic deformation. In the present study, digital image correlation (DIC)...
Article
Full-text available
Damage during cycling loading of polycrystalline metallic alloys involves localized plastic straining at the scale of individual grains. To better understand damage accumulation processes and to build models for material behavior there is a need for quantitative assessment of the heterogeneous strain fields at the grain and even more microscopic sc...
Article
Linear friction welded Ti–6Al–4V was investigated in fatigue at various stress amplitudes ranging from the high cycle fatigue (HCF) to the low cycle fatigue (LCF) regime. The base material was composed of hot-rolled Ti–6Al–4V plate that presented a strong crystallographic texture. The welds were characterized in terms of microstructure using electr...
Conference Paper
Tensile tests on Alloy 718 Ni-based superalloy at 650°C at different strain rates revealed a strain-rate dependency on the fracture mode. A change from intergranular to transgranular fracture was observed in air as the strain rate increased, mainly when Portevin-Le-Chatelier (PLC) mesoscopic deformation bands were present. To better understand the...
Article
Grain size effects on the early plastic strain localization and slip transfer at grain boundaries were investigated for the Alloy 718 Ni-based superalloy at 650 °C. Three microstructures with different grain sizes underwent monotonic tensile tests at 650 °C, both in air and under vacuum, until rupture. All the microstructure variants exhibit fully...
Article
Full-text available
A numerical approach was implemented to precisely stitch together images from the same projector/camera that form a mosaic by regularly moving either the projector/camera or the scene/sample. Such an imaging approach is used, for example, in automated microscopy. The presence of optical distortions can lead to detrimental blurring artifacts in the...
Article
Full-text available
A nickel-based superalloy is examined during monotonic deformation from ambient to cryogenic temperatures, reaching as low as liquid helium temperature. A detailed multimodal analysis of the microstructure and plasticity is conducted to discern changes in deformation mechanisms and plastic deformation localization under cryogenic conditions. This s...
Article
Full-text available
Advanced experimental and numerical approaches are being developed to capture the localization of plasticity at the nanometer scale as a function of the multiscale and heterogeneous microstructure present in metallic materials. These innovative approaches promise new avenues to understand microstructural effects on mechanical properties, accelerate...
Article
Full-text available
Background: Recent improvements in spatial resolution and measurement sensitivity for high-resolution digital image correlation (HR-DIC) now provide an avenue for the quantitative measurement of deformation events and capturing the physical nature of deformation mechanisms. However, HR-DIC measurements require significant time due to scanning elect...
Article
Full-text available
This paper develops a Bayesian inference-based probabilistic crack nucleation model for the Ni-based superalloy René 88DT under fatigue loading. A data-driven, machine learning approach is developed, identifying underlying mechanisms driving crack nucleation. An experimental set of fatigue-loaded microstructures is characterized near crack nucleati...
Article
A directionally solidified Ni-based superalloy DS200 is investigated under low (750 °C) and high temperature (900 °C) transverse creep. In-situ creep tests with strain measurements are performed to capture creep strain evolution in the individual crystallographic grains. Moreover, the microstructure configurations that promote damage nucleation are...
Article
Metallic materials experience irreversible deformation with increasing applied stress, manifested in localized slip events that result in fatigue failure upon repeated cycling. We discerned the physical origins of fatigue strength in a large set of face-centered cubic, hexagonal close-packed, and body-centered cubic metallic materials by considerin...
Article
Additively manufactured 316L stainless steels display significantly higher yield strength than their as-cast or wrought counterparts. This is associated with the micro-scale cellular structure and complex grain and sub-grain structure, resulting from high cooling rates occurring during the additive manufacturing process. The consequences of these p...
Article
Full-text available
The development of high-fidelity mechanical property prediction models for the design of polycrystalline materials relies on large volumes of microstructural feature data. Concurrently, at these same scales, the deformation fields that develop during mechanical loading can be highly heterogeneous. Spatially correlated measurements of 3D microstruct...
Article
A statistical and quantitative perspective on the incipient slip localization behavior of the HfNbTaTiZr refractory high entropy alloy is presented, after monotonic tensile testing at room temperature. High-resolution digital image correlation (HR-DIC) data collected in the scanning electron microscope (SEM) is coupled with electron back-scattered...
Article
The mechanical properties of polycrystalline metals are governed by the interaction of defects that are generated by deformation within the 3D microstructure. In materials that deform by slip, the plasticity is usually highly heterogeneous within the microstructure. Many experimental tools can be used to observe the results of slip events at the fr...
Article
Using a combination of in-situ high-resolution digital image correlation (HR-DIC), Heaviside-DIC method (H-DIC), and crystal plasticity finite element (CPFE), we investigate the evolution of intragranular lattice rotations and slip activity during monotonic and cyclic loading in a high performance, polycrystalline face centered cubic material. The...
Preprint
Full-text available
Fatigue is the most prevalent failure mode in structural materials, yet remains challenging to study due to the seemingly unpredictable nature of crack initiation. To elucidate the driving forces of crack initiation in ductile polycrystalline metals, we employ a multimodal approach to identify and track grains with a suspected potential to initiate...
Article
Full-text available
Microstructurally small crack growth was monitored in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bi-modal microstructures. The influence of the microstructure was assessed to obtain an improved understanding of the lifetime variability observed in Ti alloys. Primary α grains, basal plane cracking and misalignment across boundaries were iden...
Preprint
Full-text available
The mechanical properties of polycrystalline metals are governed by the interaction of defects that are generated by deformation within the 3D microstructure. In materials that deform by slip, the plasticity is usually highly heterogeneous within the microstructure. Many experimental tools can be used to observe the results of slip events at the fr...
Article
Full-text available
A multi-modal data-merging framework that enables the reconstruction of slip bands in three dimensions over millimeter-scale fields of view is presented. The technique combines 3D electron back-scattered diffraction (EBSD) measurements with high-resolution digital image correlation (HR-DIC) information collected in the scanning electron microscope...
Article
Full-text available
The process of crack initiation has been investigated in three widely used titanium alloys with different microstructures and loading conditions. Using low-cycle fatigue tests, a unique crack nucleation mechanism involving strain localization at (0001) twist boundaries has been identified. In order to constitute a potential crack initiation site, t...
Article
In this work, we investigate the relationship between an intense slip band (ISB) and the zone of large lattice rotations that forms ahead of the tip of the ISB. We develop a crystal plasticity finite element model of a discrete ISB lying within an oligocrystalline assembly and calculate the local crystalline stress and lattice rotation fields gener...
Article
The slip localization behavior of the polycrystalline nickel base superalloy Inconel 718 during monotonic tensile loading at room temperature, is investigated for the first time in relation to the 3D microstructure. Multi-modal data merging tools are used to recombine high resolution digital image correlation (HR-DIC) data with 3D electron back-sca...
Article
Fatigue crack nucleation at annealing twin boundaries (TBs) within polycrystal nickel-based superalloy René 88DT is investigated with a microstructure-sensitive crystal plasticity (CP) model, digital image correlation strain measurements and experimental SEM crack nucleation observations. Strong slip localizations at TBs were experimentally observe...
Article
Full-text available
Titanium alloys are processed to develop a wide range of microstructure configurations and therefore material properties. While these properties are typically measured experimentally, a framework for property prediction could greatly enhance alloy design and manufacturing. Here a microstructure-sensitive framework is presented for the prediction of...
Article
The details of polycrystalline microstructure often influence the early stages of yielding and strain localization under monotonic and cyclic loading, particularly in elastically anisotropic materials. A new software package, MechMet (mechanical metrics) provides a convenient finite element tool for solving field equations for elasticity in polycry...
Article
The microstructural origins of highly localized elastic strain concentrations in polycrystalline microstructures under monotonic loading are studied using grain-scale, in situ digital image correlation and crystal plasticity finite element method. It is shown that the locations of exceptionally high elastic strain concentrations in the microstructu...
Article
Full-text available
The equiaxed microstructure of Ti-6Al-4V contains nominally 10µm to 15µm α-phase grains. Depending on processing, these fine grains may aggregate into large, millimeter-scale regions of similar crystallographic orientation. These so-called microtextured regions are detrimental to quasi-static and fatigue properties. Their presence may facilitate th...
Article
Full-text available
Fatigue crack initiation at high temperatures occurs at microscopic fatigue shear bands that form near twin boundaries in polycrystalline nickel-base superalloys that contain minimal metallurgical defects. The associated dislocation sub-structure is complex and dependent on thermal and mechanical conditions. Here we show the formation of fine-scale...
Article
Pathways for ductility Alloys containing multiple elements can be very strong but often suffer from poor ductility. F. Wang et al. found that different mechanisms accommodated plasticity in a molybdenum-niobium-titanium multiprincipal element alloy (see the Perspective by Cairney). Instead of so-called “screw” dislocations, deformation is accommoda...
Article
Full-text available
The recent development of the high resolution and discontinuity-tolerant digital image correlation technique enables the extraction of discontinuities within a displacement field. The technique provides quantitative analysis of discontinuities arising from slip, shear bands, cracks, and grain boundary sliding in a variety of material systems, inclu...
Chapter
ThermomechanicalCharpagne, M. A. processing routes areStinville, J. C. used to produce microstructuresPolonsky, A. T. that minimize plastic strain localization at the sub-grain scale in aEchlin, M. P. polycrystalline γ-γ’ nickel-basedMurray, S. P. superalloy. This novel approachChen, Z. is made possible by the useBozzolo, N. of innovative experimen...
Chapter
Non-metallic inclusionsNon-metallic inclusions (NMIs) (NMIs) and slip bands parallel to and slightly offset from twin boundaries are observed to be preferential sites for fatigueFatigue crack nucleation in wrought superalloys. Potential interactions between NMI cracking and slip activity within neighboring grains or at twin boundaries were investig...
Article
Full-text available
There are many ways to statically characterize the structure and the mechanical behavior of materials, however time dependent measurements are still limited to small areas or volumes and often with substantially reduced resolution compared to the static measurements. For example, the time-dependent measurement of strain by digital image correlation...
Data
Time-Resolved HR-DIC on Titanium Alloy showing slip bands formation during dwell time. (Movie, gif file)
Article
Annealing twins in wrought fcc materials have historically been characterized using simple 2D measures including morphology and volume fraction. Accurately describing twin related domain microstructure requires accounting for their complex 3D structure. A large microstructural volume of a nickel-base alloy René 88DT has been collected using TriBeam...
Experiment Findings
https://www.youtube.com/watch?v=Ek7pTsCMt4A&list=PLgA8-PcNho1b3FqR_pLGuMKP9KTeTL6SV
Method
https://www.youtube.com/watch?v=oCD1b_a79xo&list=PLgA8-PcNho1ZmDsIZc47wUlL5CvMsB9gB
Method
https://www.youtube.com/watch?v=we-vnBZDe5w&list=PLgA8-PcNho1YODXegQjaQM-NoD4GeGT0h
Method
https://www.youtube.com/watch?v=oDtYjZ5RlxU&list=PLgA8-PcNho1bK0cwxu5zaNo_DtHhxY0Xn
Method
https://www.youtube.com/watch?v=LM4_O-lJfIE&list=PLgA8-PcNho1Yym57N0efyp2wqrSUBzAuJ
Method
https://www.youtube.com/watch?v=BliYO-UDwVU&list=PLgA8-PcNho1aVskIN-qOfgRM4ha8TQOBm
Experiment Findings
https://www.youtube.com/watch?v=oCD1b_a79xo&list=PLgA8-PcNho1ZmDsIZc47wUlL5CvMsB9gB
Experiment Findings
https://www.youtube.com/watch?v=BliYO-UDwVU&list=PLgA8-PcNho1aVskIN-qOfgRM4ha8TQOBm
Experiment Findings
https://www.youtube.com/watch?v=LM4_O-lJfIE&list=PLgA8-PcNho1Yym57N0efyp2wqrSUBzAuJ
Experiment Findings
https://www.youtube.com/watch?v=oDtYjZ5RlxU&list=PLgA8-PcNho1bK0cwxu5zaNo_DtHhxY0Xn
Experiment Findings
https://www.youtube.com/watch?v=we-vnBZDe5w&list=PLgA8-PcNho1YODXegQjaQM-NoD4GeGT0h
Chapter
The component design and fatigue life prediction of turbine disk alloys are critically dependent on the thermomechanical properties of the material. The TriBeam microscope provides a pathway to capture large, targeted 3D microstructural data volumes from turbine disk alloys in order to instantiate models that are used to simulate mechanical loading...
Chapter
This chapter discusses fundamental aspects of the development of statistically equivalent virtual microstructures (SEVMs) and microstructure and property-based statistically equivalent representative volume elements (M-SERVE and P-SERVE) of the Ni-based superalloy at multiple scales. The two specific scales considered for this development are the s...
Article
Full-text available
A multi-modal data recombination method that enables the automated, quantitative and statistical assessment of strain localization as a function of the microstructure is presented. It consists of merging high resolution digital image correlation (HR-DIC) datasets collected in a scanning electron microscope (SEM), with crystallographic data obtained...
Article
Full-text available
Fatigue crack nucleation in crystalline materials typically develops due to highly localized cyclic slip. During a fatigue cycle, reverse slip differs locally from slip in the forward direction particularly in precipitate containing materials such as superalloys. In this paper we report the first direct measurements of irreversibility at the scale...
Article
Full-text available
Fatigue cracks initiating from surface and sub-surface non-metallic inclusions (NMIs) have recently been demonstrated to be a necessary but not sufficient explanation for atypically short low-cycle fatigue life in Inconel 718 alloy at intermediate temperature. Therefore, the early stages of short crack propagation from surface NMIs were investigate...
Article
A new class of γ′-containing Co-based superalloys that are promising for high temperature applications has been investigated under cyclic loading conditions. A series of single crystal variants of these Co-based superalloys have been cyclically loaded above their elastic limit at 750∘C in air to study their behavior in the low cycle regime. Interru...
Article
Full-text available
The mechanical properties of titanium alloys result from their complex multi-scale microstructural features, including micron scale precipitates and millimeter scale microtextured regions (MTRs). While previous investigations have revealed that the presence of mm-scale MTRs can degrade mechanical properties, particularly fatigue, the accompanying s...
Article
Full-text available
Free access ==> https://authors.elsevier.com/a/1Yne3_UwYsEKgM ********************************************************************* High-resolution digital image correlation (HR-DIC) techniques have become essential in material mechanics to assess strain measurements at the scale of the elementary mechanisms responsible of the deformation in polyc...
Article
Full-text available
Micro-tensile specimens of nickel based-superalloy oligocrystals were tested in-situ in an SEM in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load-and temporal-resolution se...
Article
Full-text available
The advancement of materials science at the mesoscale requires improvements in both sampling volumes/areas and spatial resolution in order to make statistically significant measurements of microstructures that influence higher-order material properties, such as fatigue and fracture. Therefore, SEM-based techniques have become desirable due to impro...
Article
Quantification of mesoscale microstructures of polycrystalline materials is important for a range of practical tasks of materials design and development. The current protocols of quantifying grain size and morphology often rely on microstructure metrics (e.g., mean grain diameter) that overlook important details of the mesostructure. In this work,...
Article
This paper details the creation of experimental and computational frameworks to capture high-resolution, microscale deformation mechanisms and their relation to microstructure over large (mm-scale) fields of view. Scanning electron microscopy with custom automation and external beam control was used to capture 209 low-distortion micrographs of 360...
Article
This paper has three major objectives related to the development of computational micromechanics models of Ni-based superalloys, containing a large number of annealing twins. The first is the development of a robust methodology for generating 3D statistically equivalent virtual polycrystalline microstructures (3D-SEVPM) of Ni-based superalloys. Sta...