Article
Engineering, Geological
Yian Chen, Jiang Xu, Shoujian Peng, Qianwen Zhang, Cancan Chen
Summary: This study conducted triaxial compression tests on sandstone samples under different seepage pressures using a 3D digital image correlation technique. The results revealed that the strength and brittleness of the rock decrease with increasing seepage pressure, and the mechanical properties of the rock are highly dependent on the seepage pressure. The analysis of the radial strain field on the rock surface showed a gradual process of strain localization instead of a sudden occurrence before failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Guangzhao Han, Lixun Cai, Maobo Huang, Xiaokun Liu
Summary: This study developed an analytical elastoplastic model for unidirectional loaded specimens of isotropic-homogeneous ductile materials, and proposed a data processing method to obtain the equivalent stress-strain in real time. The method was validated through finite element analyses and experiments, showing consistency with preset stress-strain curves and standard tensile results. This approach has the potential to promote the use of non-traditional and small specimens for assessing material mechanical properties.
MATERIALS & DESIGN
(2021)
Article
Engineering, Geological
Aijun Chen, Chaohua Li, Chuanyang Ding
Summary: Red clay is vulnerable to cracking in dry environments, which compromises soil structures and slope stability. A desiccation test using a self-made device and digital image correlation technology was conducted to study crack evolution and quantitatively analyze the relationships between moisture content, displacement, strain, and cracks. The findings provide insights into crack initiation and propagation, as well as the impact of moisture content and soil characteristics on crack evolution. The results can guide the formulation of engineering geological hazard control measures.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Erika Tudisco, Claudia Vitone, Cristina Mondello, Gioacchino Viggiani, Stefanos Athanasopoulos, Stephen A. Hall, Federica Cotecchia
Summary: This paper presents the main results of an experimental study on the mechanics of intensely fissured natural clays, specifically exploring the influence of fissure orientation and stress level on material response. Through plane strain compression experiments, a clear and consistent picture of the interplay between fissure orientation and stress level was obtained, revealing complex deformation patterns.
Article
Materials Science, Multidisciplinary
Ana Vrgoc, Zvonimir Tomicevic, Benjamin Smaniotto, Francois Hild
Summary: The results of in-situ cyclic tensile experiments on glass fiber mat reinforced polyester resin dogbone specimens were analyzed using X-ray Computed Tomography and Digital Volume Correlation. Both specimens failed at equal stress levels, indicating the notch insensitivity of the material. Strain and damage analysis showed the development of inner strained bands in both specimens, even in the first loading cycle, indicating the path to final fracture. The study concludes that the final failure of the material was primarily driven by the yarn mesostructure.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Peihao Song, Akash Trivedi, Clive R. Siviour
Summary: This research aims to investigate whether a more accurate calibration of a material model can be obtained by considering the local strain-time response calculated from full-field displacement information obtained using digital image correlation. The study combines tensile experiments with compression test data to successfully calibrate the constitutive model of polymers. It demonstrates that using force-displacement information from tensile experiments alone is insufficient for model calibration.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
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
Engineering, Manufacturing
M. Gljuscic, M. Franulovic, D. Lanc, A. Zerovnik
Summary: The development of additive manufacturing technologies has led to an increase in material variety, particularly by introducing various reinforcements to enhance the mechanical performance of polymers. This study proposes a microscale analysis method based on representative volume element (RVE) models and statistically significant data acquired from microscopic analysis, in order to optimize the microstructure parameters before experimental validation. The results of experimental and numerical tests on carbon fiber reinforced composites were systematically compared with published data, providing guidance for protocol applicability and the need for further improvements.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Multidisciplinary
Zhiqing Li, Youxing Kong, Le Fu, Yingxin Zhou, Zhengfu Qian, Ruilin Hu
Summary: The study investigates the relationship between crack development and slope state in fissured expansive soils under different loading and irrigation conditions. Results show that excessive stress revives existing cracks and causes sliding, while water infiltration leads to shallower sliding surfaces. Understanding the strain state of cracks and deformation trend in slopes under loading and infiltration is crucial for reinforcing key areas in slopes containing abundant cracks.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
Pieter Hofman, Lu Ke, Frans P. van der Meer
Summary: A common choice for multiscale modeling of composite materials is to use periodic boundary conditions on square and cubical representative volume elements (RVEs). However, existing methods fail to reproduce the transverse isotropy of composites with strain localization, and rotating or shifting the periodicity constraints introduces mismatching microstructure. This study proposes a new formulation of periodic boundary conditions on circular RVEs, which allows for a single fully developed localization band under arbitrary angle. The results show that the circular RVE with the new formulation successfully predicts a transversely isotropic response without mismatching microstructure and the length scale parameter is well-defined and independent of the RVE's orientation.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Changshuo Wang, Rui Yong, Shigui Du, Zhanyou Luo, Chuxia Huang, Jun Ye
Summary: The direct shear test is commonly used for determining the shear strength of rock joints. However, the heterogeneity of rock joints can result in significant variations in measured shear strength. This paper investigates the heterogeneity of rock joints and proposes a new sampling method for selecting representative specimens. The proposed method, based on maximum likelihood estimation, can provide reliable shear strength parameters and envelopes for rock joints.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Mechanical
Xiaocen Duan, Jianyong Huang
Summary: With the rapid development of 3D volume imaging technology, digital volume correlation (DVC) has become an indispensable tool in various engineering fields. In this study, a novel deep learning-based DVC methodology called DVC-Net is proposed to achieve accurate and efficient 3D deformation analysis. The method consists of three sub-networks for different tasks, including integer-voxel searching, sub-voxel registration, and displacement field denoising. The DVC-Net reduces computational complexity and is suitable for practical problems such as changes in lighting conditions or noisy images.
EXTREME MECHANICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Hai -Ling Shi, Thomas Rougelot, Shou-Yi Xie, Jian-Fu Shao, Minh-Ngoc Vu, Jean Talandier
Summary: The influences of resaturation processes in claystone were investigated using X-ray microtomography and Digital Volume Correlation. The results indicate that these processes have a significant impact on the mechanical properties of claystone at the sample scale.
Article
Engineering, Geological
H. L. Shi, T. Rougelot, S. Y. Xie, J. F. Shao, J. Talandier
Summary: The objective of this study is to investigate the deformation behavior of anisotropic claystone in relation to material heterogeneity. Five triaxial compression tests were conducted on Callovo-Oxfordian claystone samples under in-situ X-ray micro-tomography monitoring. Complete 3D images of the samples' full loading history were analyzed, and non-uniform strain fields were determined. The study focused on the effects of bedding planes, initial cracks, and confining stress on strain fields, and found that the structural anisotropy and confining pressure have a strong influence on strain distribution and cracking process.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Geological
Hai-Ling Shi, Jerome Hosdez, Thomas Rougelot, Shou-Yi Xie, Jian-Fu Shao, Jean Talandier
Summary: This study investigates strain localization and cracking processes in hard clayey rock using X-ray micro-tomography, revealing a clear influence of material heterogeneities on these phenomena.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Agriculture, Multidisciplinary
Ramune Kuktaite, Ritva Repo-Carrasco-Valencia, Cesar C. H. de Mendoza, Tomas S. Plivelic, Stephen Hall, Eva Johansson
Summary: This study demonstrates how extrusion processing and post-processing heat treatment can be utilized to create appealing future food alternatives, such as breakfast cereal flakes and porridge powder, from quinoa grains. The protein crosslinking of quinoa was significantly affected by the processing temperature and conditions used during extrusion. Additionally, starch crystallinity decreased most when the product was dried after processing, indicating the potential for improved product quality through drying.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2022)
Article
Engineering, Geological
Erika Tudisco, Claudia Vitone, Cristina Mondello, Gioacchino Viggiani, Stefanos Athanasopoulos, Stephen A. Hall, Federica Cotecchia
Summary: This paper presents the main results of an experimental study on the mechanics of intensely fissured natural clays, specifically exploring the influence of fissure orientation and stress level on material response. Through plane strain compression experiments, a clear and consistent picture of the interplay between fissure orientation and stress level was obtained, revealing complex deformation patterns.
Article
Engineering, Geological
Antonio Jose Roque, Evan K. Paleologos, Brendan C. O'Kelly, Anh Minh Tang, Krishna R. Reddy, Claudia Vitone, Abdel-Mohsen O. Mohamed, Eugeniusz Koda, Venkata Siva Naga Sai Goli, Castorina S. Vieira, Xunchang Fei, Francesca Sollecito, Magdalena Daria Vaverkova, Michael Plotze, Rossella Petti, Anna Podlasek, Alexander M. Puzrin, Federica Cotecchia, Piotr Osinski, Arif Mohammad, Prithvendra Singh, Maisa El Gamal, Sherine Farouk, Moza T. Al Nahyan, Slobodan B. Mickovski, Devendra Narain Singh
Summary: This paper focuses on the opportunities for environmental geotechnics to promote the shift towards a green, circular economy and sustainable technologies and practices in the revitalisation of the global economy after the Covid-19 era. It discusses solutions and improvements in various thematic areas, such as waste re-entry into the production cycle, landfill management, contaminated site remediation, and sustainable ground improvement. The potential of thermo-active geostructures to contribute to renewable energy is also explored.
ENVIRONMENTAL GEOTECHNICS
(2022)
Article
Mechanics
Dan Wu, Jonas Engqvist, Christophe Barbier, Christopher Karlsson, Stephen Hall
Summary: The study investigated the mechanical behavior of compacted paper using tensile tests and X-ray tomography, revealing the mechanism of paper extensibility and confirming the existence of micro-crepes flattened under tension.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Characterization & Testing
Sara Johansson, Jonas Engqvist, Johan Tryding, Stephen A. Hall
Summary: This study investigated the deformation and failure mechanisms of paperboard material using synchrotron X-ray tomography, revealing significant differences in fracture characteristics and strain field distributions between samples tested in different loading directions.
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
Agronomy
Sbatie Lama, Pernilla Vallenback, Stephen A. Hall, Marina Kuzmenkova, Ramune Kuktaite
Summary: Fluctuating climate, heat, and drought are expected to considerably impact bread wheat quality. This study investigated the effect of heat and drought on gluten proteins in spring wheat genotypes and found that prolonged heat and drought led to increased gluten polymerization and the formation of large polymers. Cooler climate, on the other hand, increased total protein concentration and accumulation of monomeric proteins. Wheat genotypes that provide stable yield and gluten properties in different climates are crucial for future wheat supply.
FOOD AND ENERGY SECURITY
(2022)
Article
Plant Sciences
Per Snell, Mark Wilkinson, Gavin J. Taylor, Stephen Hall, Shrikant Sharma, Nick Sirijovski, Mats Hansson, Peter R. Shewry, Per Hofvander, Asa Grimberg
Summary: This study characterized grains and flours from field-grown transgenic wheat expressing AsWRI1 gene. The results showed that the developing caryopses of AsWRI1-wheat grains had increased triacylglycerol content and decreased starch content. Additionally, mature AsWRI1-wheat grains were lighter, wrinkled, and had a shrunken endosperm. The flour fractions from AsWRI1-wheat were contaminated with bran due to the effects of the changed morphology on milling.
Article
Biotechnology & Applied Microbiology
Elin Tornquist, Sophie Le Cann, Alessandro Tengattini, Lukas Helfen, Joeri Kok, Stephen A. Hall, Hanna Isaksson
Summary: Neutron tomography is a promising imaging technique for bone research. This study investigated the effects of drying and rehydration on image quality and mechanical properties of bone using neutron tomography, and found that contrast between bone and soft tissue can be enhanced via rehydration, while the mechanical properties were unaffected by the fluid exchange protocol.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Sahar Sultan, Nebu Thomas, Mekha Varghese, Yogesh Dalvi, Shilpa Joy, Stephen Hall, Aji P. Mathew
Summary: This study successfully developed bio-based and patient-specific three-dimensional scaffolds for bone tissue regeneration using 3D printing technology. The composite scaffolds were analyzed for their macro- and microstructures, mechanical properties, in vitro cytotoxicity, and in vivo biocompatibility. The results showed that the composite scaffolds had uniform particle distribution, significantly increased mechanical strength, and demonstrated good biocompatibility.
Article
Engineering, Chemical
Helen Lewis, Gary Couples, Alessandro Tengattini, Jim Buckman, Erika Tudisco, Maddi Etxegarai, Gioacchino Viggiani, Stephen A. Hall
Summary: Neutron imaging is used to directly observe water-air and deuterated water-normal water exchanges in flow experiments on microporous limestone. The study reveals significant water speed and flow direction variability at the deci-micron scale, as well as complex patterns of water saturation. The findings suggest that capillarity-driven and pressure-driven water movement occur concurrently and compete with each other, with their dominance changing as water saturations evolve.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Engineering, Multidisciplinary
Axel Henningsson, Adrian G. Wills, Stephen A. Hall, Johannes Hendriks, Jonathan P. Wright, Thomas B. Schon, Henning F. Poulsen
Summary: This study investigates the problem of estimating crystal elastic strain tensor from strain tensor probability distribution, and provides analytical parametrizations and maximum-likelihood estimations in the case of multivariate Gaussian strain tensor distribution. The proposed algorithm is demonstrated to be useful in single crystal monochromatic X-ray scattering through numerical simulations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Electrochemistry
Yu-Chuan Chien, He Li, John Lampkin, Stephen Hall, Nuria Garcia-Araez, William R. Brant, Daniel Brandell, Matthew J. Lacey
Summary: This study demonstrates that mechanical compression at elevated temperature can effectively increase the capacity density of lithium-sulfur battery electrodes and extend their cycle life. It highlights the importance of a homogeneous electrode structure in the lithium-sulfur system.
BATTERIES & SUPERCAPS
(2022)
Article
Physics, Fluids & Plasmas
Chongpu Zhai, Nahuel Albayrak, Jonas Engqvist, Stephen A. Hall, Jonathan Wright, Marta Majkut, Eric B. Herbold, Ryan C. Hurley
Summary: The study investigates the local rearrangements that occur during the deformation process of 3D granular materials under different boundary conditions. The results show that these rearrangements are correlated on a scale of three to four particle diameters, exhibit volumetric strain-shear strain and nonaffine displacement-rotation coupling, and may occur repeatedly during incremental sample strain. The findings suggest that local structure may play at least as important of a role as local stress in determining the nature of local rearrangements.
Article
Engineering, Environmental
Faraz Muneer, Mikael S. Hedenqvist, Stephen Hall, Ramune Kuktaite
Summary: A new method was developed to design sustainable microfibers from wheat gluten proteins using a nonreducing solvent and electrospinning. The morphology, protein chemistry, and cross-linking, as well as the secondary structure of the fibers, were investigated. Heat treatment of the fibers increased protein cross-linking and positively contributed to the functional performance. The heat-treated electrospun fibers with 20% gluten exhibited a high blood absorption capacity and reasonable stability, making them suitable for absorbents in healthcare applications.
ACS ENVIRONMENTAL AU
(2022)
