Article
Materials Science, Multidisciplinary
Ante Buljac, Xiang Kong, Lukas Helfen, Francois Hild, Thilo F. Morgeneyer
Summary: Damage and strain changes during shear dominated loading were studied using synchrotron laminography and digital volume correlation (DVC). The results showed localized strain fields and grain-related elongated cracks in the shear zone, with damage primarily concentrated in the gage section subjected to shear. The total Hencky von Mises strain close to failure was measured in the material bulk, reaching values between 0.6 and 0.7.
MECHANICS OF MATERIALS
(2023)
Article
Thermodynamics
Haizhou Liu, Lingtao Mao, Yang Ju, Francois Hild
Summary: In order to investigate the damage development of coal under different loading conditions, in-situ tests in uniaxial and triaxial compression were conducted. Advanced digital volume correlation based on finite element discretization was used to quantify the three-dimensional initial and newborn fractures. The experiments revealed that the damage growth in coal was substantially affected by randomly distributed initial defects, and prior to a macroscopic failure, the coal samples generally experienced pre-existing fracture closure, newborn fracture initiation, interaction and propagation of the two fracture types. The study aimed to gain in-depth insights into the bulk fracture of coal and provide quantitative evidence for further understanding the damage mechanisms from the microscale to the macroscale.
Article
Materials Science, Composites
Mahoor Mehdikhani, Christian Breite, Yentl Swolfs, Jeroen Soete, Martine Wevers, Stepan V. Lomov, Larissa Gorbatikh
Summary: This study explores the potential of Digital Volume Correlation (DVC) in detecting and characterizing damage in fiber-reinforced composites using in-situ X-ray Computed Tomography. Through preliminary analysis of digital deformation images and real-deformation images acquired during in-situ tensile loading, DVC proves to be a promising tool for quantification of deformation and damage at both mesoscale and microscale levels. Damage mechanisms in fiber-reinforced composites are successfully detected and characterized using DVC, showing the limitations of traditional methods like grayscale thresholding.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Henrik Granum, David Morin, Tore Borvik, Odd Sture Hopperstad
Summary: This paper presents a novel calibration procedure for the modified Mohr-Coulomb (MMC) fracture model using localization analyses on three tempers of an AA6016 aluminium alloy. The metal plasticity and porous plasticity models are calibrated using different methods, and localization analyses are shown to be a cost-effective and reliable tool for predicting ductile failure.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Geological
Haizhou Liu, Lingtao Mao, Xuyang Chang, Francois Hild
Summary: In this paper, an advanced global approach (i.e., multimesh DVC) was developed to measure bulk deformation of rocks in in-situ experiments. The scheme provided a means to quantitatively understand the damage mechanisms in rocks at different scales. The paper achieved very fine crack opening displacement fields to reveal damage initiation and growth.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Mechanical
Xiang Kong, Thilo F. Morgeneyer, Djamel Missoum-Benziane, Gilles Rousselier
Summary: A ductile damage model was applied to study the failure behavior of anisotropic aluminum alloy sheet specimens under non-proportional load path changes. The model combined classical void growth and Coulomb ductile model, and was validated using experiments. The model successfully predicted non-proportional failure.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Physical
Piotr Podolak, Magda Drozdziel-Jurkiewicz, Patryk Jakubczak, Jaroslaw Bienias
Summary: An experimental analysis was conducted to evaluate the mechanical behavior of aluminium-based fibre metal laminates under compression after impact. Damage initiation and propagation were assessed for critical state and force thresholds. Parametrization of laminates was done to compare their damage tolerance. Results showed that relatively low-energy impact had a marginal effect on the compressive strength of fibre metal laminates. The aluminium-glass laminate exhibited higher damage resistance while the aluminium-carbon laminate had greater energy dissipation ability. Significant damage propagation before the critical load was observed.
Article
Materials Science, Characterization & Testing
Yuka Kojima, Hidehiko Kimura, Daigo Setoyama, Michiaki Kamiyama, Takayuki Hirai, Taiki Kano
Summary: In this study, non-destructive throughthickness measurements were conducted to investigate the internal fatigue damage behavior in fiber-reinforced plastics. It was found that under fatigue loading, voids and delaminations were nucleated near the notch tip, and the damaged zone extended with incremental fatigue cycles. Furthermore, the damage zone was larger near the surfaces in plane-stress condition than inside the specimen in plane-strain condition.
Article
Mechanics
Abhinav Goyal, Garrett W. Melenka
Summary: Hybrid braided composites combine multiple reinforcing fibres in a matrix. This study aims to understand the internal strain behavior of hybrid braided composites using Digital Volume Correlation (DVC) technique. DVC allows for the generation of three-dimensional displacement and strain fields.
COMPOSITE STRUCTURES
(2023)
Article
Optics
Ruobing Zhao, Xiaodong Hu, Yiming Jiang, Ming Chen, Jing Zou
Summary: The IDD algorithm proposed in this paper can achieve PLO reconstruction in the LCL system under extremely sparse sampling conditions and effectively reduce inter-slice aliasing and blurring.
Article
Engineering, Civil
Ying Zhang, Yuanqing Wang, Xi Guo, Xinhang Zhi, Zhongxing Wang, Xiaowei Liu
Summary: In this paper, a new design method is proposed to accurately predict the ultimate resistance of aluminium alloy shear connections with preloaded stainless steel swage-locking pins. The structural performance of shear connections made of different aluminium alloy grades was extensively studied, and the effect of friction and pin hole resistance at ultimate loads was discussed.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Geological
H. Shariati, A. Bouterf, M. Saadati, P-L Larsson, F. Hild
Summary: The spherical indentation of granite was investigated using Digital Volume Correlation (DVC) to probe constitutive laws of the rock. Three laws were studied, including pure elasticity, compressible elastoplasticity, and compressible elastoplasticity coupled with damage, with a focus on frictional contact effects. Results indicate that considering compressible elastoplasticity is crucial for accurate results, and frictional effects play a significant role in damage extent.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Chemistry, Physical
Kai Zhang, Qingsheng He, Jeremy H. Rao, Yuan Wang, Ruifeng Zhang, Xini Yuan, Weijun Feng, Aijun Huang
Summary: The study found that Cube and Cube(ND) texture components play a significant role in the hemming performance of AA6XXX aluminium alloy sheet, while other texture components may only benefit the hemming performance in certain bending directions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Biomedical
C. M. Disney, J. Mo, A. Eckersley, A. J. Bodey, J. A. Hoyland, M. J. Sherratt, A. A. Pitsillides, P. D. Lee, B. K. Bay
Summary: This study used synchrotron computed tomography to investigate the structural and functional differences in collagen fibers within the intervertebral disc. The results showed significant variations in fiber orientation, curvature, and strain between different regions, which are important for understanding tissue compliance and strain transfer.
ACTA BIOMATERIALIA
(2022)
Article
Materials Science, Composites
Ana Vrgoc, Zvonimir Tomicevic, Benjamin Smaniotto, Francois Hild
Summary: In-situ assessment of strain and damage distributions in a dogbone specimen with a rectangular notch was conducted using X-ray computed tomography and digital volume correlation. The specimen, made of continuous glass fiber mat reinforced polyester resin composite plate, was cyclically tensile loaded. The strain-damage interplay was evaluated through analysis of major eigen strain and correlation residual fields. A strained band formed at the notch root and led to final failure. The first cracks did not initiate at the notched region despite high strain gradients. Statistical analysis showed higher standard deviations of major eigen strain distributions in the remaining part of the specimen compared to the notched region.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Josefin Martell, Carl Alwmark, Luke Daly, Stephen Hall, Sanna Alwmark, Robin Woracek, Johan Hektor, Lukas Helfen, Alessandro Tengattini, Martin Lee
Summary: This study explores the three-dimensional distribution of hydrous phases within the nakhlite meteorite and reveals that the alteration is localized and of short duration. This implies that habitable environments could not have been sustained on Mars during the Amazonian period.
Article
Materials Science, Multidisciplinary
Richi Kumar, Jacques Besson, Andrew King, Anna Dahl, Thilo F. Morgeneyer
Summary: Higher crack growth resistance is found in 15NiCuMoNb5 (WB36) ferritic steel during Single Edge Notched Tensile (SENT) testing compared to Compact Tension (CT) testing. Synchrotron microtomography, post mortem fractography, and elasto-plastic 3D finite element simulations are used to identify differences in damage mechanisms and reveal that secondary nucleation on carbides needs to be taken into account in modeling failure in SENT samples.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Article
Multidisciplinary Sciences
Joey Disch, Luca Bohn, Susanne Koch, Michael Schulz, Yiyong Han, Alessandro Tengattini, Lukas Helfen, Matthias Breitwieser, Severin Vierrath
Summary: In this study, the authors use high-resolution neutron imaging to uncover the water distribution and salt precipitation issues in CO2 electrolyzers, which are major hurdles for their steady operation.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Thomas Straubinger, Carsten Hartmann, Merve P. Kabukcuoglu, Martin Albrecht, Matthias Bickermann, Andrew Klump, Simon Bode, Elias Hamann, Simon Haaga, Mathias Hurst, Thomas Schroeder, Daniel Haenschke, Carsten Richter
Summary: The evolution of dislocations in a sublimation-grown aluminum nitride crystal with low-temperature gradients and low thermal stress is investigated using different X-ray diffraction imaging methods. Individual dislocations and their progression in the crystal volume, including the strained interface region, are identified through weak-beam contrast imaging and 3D interpretation. The absence of slip in the laterally grown crystal volume suggests that the movement of dislocations is driven by impurities rather than dislocation glide, due to low-temperature gradients and low thermal stress below the critical resolved shear stress (CRSS).
CRYSTAL GROWTH & DESIGN
(2023)
Article
Multidisciplinary Sciences
Mathias Hurst, Lukas Helfen, Thilo F. Morgeneyer, Heikki Suhonen, Ante Buljac, Francois Hild, Jussi-Petteri Suuronen, Tilo Baumbach, Daniel Haenschke
Summary: A hierarchical guidance system for 3D nanoscale X-ray imaging is developed, which enables identification, refinement, and tracking of regions of interest within samples beyond the field of view. This approach utilizes rapid multiscale measurements and on-the-fly data processing for immediate feedback on experimental progress. Experimental validation demonstrates the potential of hierarchical guidance for in situ investigations of damage nucleation and deformation kinematics in sheet materials.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Manufacturing
Melanie Prost, Alain Koster, Djamel Missoum-Benziane, Sylvain Depinoy, Lyliat Ferhat, Matthieu Rambaudon, Vincent Maurel
Summary: This study investigates the effect of strong anisotropy on fatigue crack growth in a superalloy processed by additive manufacturing. Two specimens with significantly different crystallographic textures were analyzed to represent variations of microstructures in real parts. The investigation focused on cyclic mechanical behavior and fatigue crack growth at high temperature. The oriented microstructure resulted in high levels of anisotropy in elastic and viscoplastic behaviors, which were modeled using orthotropic elasticity, Hill's criterion, and kinematic hardening laws. Finite element analysis with a 3D crack shape description was performed to assess fatigue crack growth driving forces. It was found that fatigue cracks mainly grew at grain boundaries regardless of the crystallographic orientation. An intrinsic fatigue crack growth rate related to intergranular mechanisms was determined, while transgranular crack growth was dominant when loading was applied in the processing direction, with crystallographic texture being the main factor governing the growth rate.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Robert Bradbury, Nikolay Kardjilov, Georg F. Dewald, Alessandro Tengattini, Lukas Helfen, Wolfgang G. Zeier, Ingo Manke
Summary: The elucidation of lithium ion transport pathways through a solid electrolyte separator is important for the development of all-solid-state batteries. Neutron imaging was performed on an all-solid-state lithium-sulfur battery using an increased Li-6 content in the anode. This allowed for differentiation between the mobile lithium ions diffusing through the cell and those initially located in the solid electrolyte, and demonstrated the lithium ion diffusion through the cell and the distribution of trapped lithium ions in charged and discharged states.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Mechanical
Nicolas Leost, Alain Koester, Djamel Missoum-Benziane, Matthieu Rambaudon, Laurent Cameriano, Francois Comte, Brice Le Pannerer, Vincent Maurel
Summary: This study combines infrared thermography, digital image correlation, and machine learning to measure temperature, strain, and damage fields at high temperatures. It is applied to thermomechanical fatigue (TMF) testing with severe gradients for typical out-of-phase loading conditions. The study demonstrates the identification/validation of behavior and damage models for a Co-based superalloy (Haynes 188). The key point in this analysis is the thermal gradient model. TMF finite element analysis validates the entire model framework for loading and damage.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Xiang Kong, Thilo F. Morgeneyer, Djamel Missoum-Benziane, Gilles Rousselier
Summary: A ductile damage model was applied to study the failure behavior of anisotropic aluminum alloy sheet specimens under non-proportional load path changes. The model combined classical void growth and Coulomb ductile model, and was validated using experiments. The model successfully predicted non-proportional failure.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Mechanics
N. Guillermin, J. Besson, A. Koster, L. Lacourt, M. Maziere, H. Chalons, S. Forest
Summary: High-pressure turbine disks are subjected to extreme mechanical and thermal loadings throughout their life-time. This study focuses on accurately calibrating a viscoplastic behavior model at high temperature for the nickel-based superalloy Inconel718. Experimental testing is conducted to describe the material behavior, and digital image correlation is used to measure strain carried by the PLC bands. Finite element simulations are performed to validate the models and detect instabilities due to geometrical singularities.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Ante Buljac, Xiang Kong, Lukas Helfen, Francois Hild, Thilo F. Morgeneyer
Summary: Damage and strain changes during shear dominated loading were studied using synchrotron laminography and digital volume correlation (DVC). The results showed localized strain fields and grain-related elongated cracks in the shear zone, with damage primarily concentrated in the gage section subjected to shear. The total Hencky von Mises strain close to failure was measured in the material bulk, reaching values between 0.6 and 0.7.
MECHANICS OF MATERIALS
(2023)
Proceedings Paper
Engineering, Multidisciplinary
Laury-Hann Brassart, Samy Blusseau, Francois Willot, Francesco Delloro, Gilles Rolland, Jacques Besson, Anne-Francoise Gourgues-Lorenzon, Michel Jeandin
Summary: We develop a machine-learning image segmentation pipeline to detect ductile fracture in metal materials. The validity of our approach is demonstrated by using a set of images representing fracture surfaces from cold-spray deposits. The machine-learning method shows good predictive capabilities comparable to human expert segmentation.
PROGRESS IN INDUSTRIAL MATHEMATICS AT ECMI
(2022)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.
