Article
Materials Science, Multidisciplinary
Shubham, Rajesh Kumar Prusty, Bankim Chandra Ray
Summary: In this study, a parametric investigation of the compressive Split Hopkinson Pressure Bar (SHPB) setup was conducted using Abaqus software for finite element analysis (FEA). The numerical results were experimentally validated, and it was found that increasing the striker velocity leads to an increase in the absolute magnitude of the incident strain at peak, while the rise time remains constant. On the other hand, increasing the angle of the symmetrically non-parallel plane surface and the fillet radius results in a similar absolute value of the incident strain at peak, but a longer rise time. This study helps understand the nature and discrepancy of the incident strain signal in the compressive SHPB setup and identify its root cause.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Manish Kumar Gupta
Summary: The study of high strain rate characteristics is essential for understanding the behavior of materials in dynamic conditions, which can be done through experimental techniques or finite element simulations. The results show that the amplitude and duration of waves depend on the parameters of the striker.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Mechanical
Chenlin Liu, Weibin Wang, Tao Suo, Zhongbin Tang, Yazhou Guo, Yulong Li
Summary: This paper introduces a Combined Tension-Torsion Split Hopkinson Bar system that can load specimens synchronously under high strain rates. The system utilizes electromagnetic energy conversion technique and a new Electromagnetic-release Split Hopkinson Torsion Bar system to achieve precise control and generation of stress pulses.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Polymer Science
Xintao Zhu, Xiaojing Zhang, Wenjin Yao, Wenbin Li
Summary: Using a split-Hopkinson pressure bar test instrument with temperature control, this study tested the dynamic mechanical properties of silicone rubber at different temperatures and strain rates. The results showed that silicone rubber is sensitive to both strain rate and temperature, with the yield strength increasing with higher strain rates and showing temperature sensitivity at higher rates.
Article
Geosciences, Multidisciplinary
Zhoujie Gu, Rongxi Shen, Zhentang Liu, Enlai Zhao, Hailiang Chen, Zichen Yuan, Xiaomeng Chu, Jiawei Tian
Summary: Dynamic failure experiments were conducted on coal samples under dynamic load in a triaxial Split-Hopkinson pressure bar test system to study the dynamic characteristics of coal in a multi-axial pre-stress state. The experiments showed that the 3D pre-stress state significantly affects the dynamic failure of coal. The dynamic initial stress of coal increases linearly with strain, then grows at a reduced rate until the peak strength, and the mechanical curve rebounds notably. The dynamic strength factors of coal vary significantly with the increase of confining pressure.
NATURAL RESOURCES RESEARCH
(2023)
Article
Engineering, Mechanical
Yifei Meng, Yuting Yang, Weibin Wang, Qingbo Dou, Tao Suo
Summary: An improved high-temperature dynamic torsion experimental method was developed in this study, utilizing an electromagnetic torsional Hopkinson bar equipped with a special system and proposing a double-flange thin-walled tubular specimen, achieving online heating and synchronous assembly successfully. This provides a new approach for studying the shear mechanical properties of materials under high strain rates and high temperatures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Mechanical
Yifei Meng, Yuting Yang, Weibin Wang, Qingbo Dou, Tao Suo
Summary: This study developed an improved high-temperature dynamic torsion experimental method for determining the shear mechanical properties of materials under the coupling effect of high strain rates and high temperatures. By optimizing the specimen design and strain measurement correction method, the accuracy and reliability of the tests were improved. Experimental results demonstrated the suitability of this method for strain rate testing at different temperatures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Mining & Mineral Processing
Xin Chen, Xiuzhi Shi, Jian Zhou, Enming Li, Peiyong Qiu, Yonggang Gou
Summary: The research utilized SHPB to test the high strain rate compressive behavior of cemented paste backfill (CPB). The results showed that increasing the cement content, tailings content, and curing age can improve the dynamic compressive strength and elastic modulus of CPB. Under dynamic loading, higher strain rates lead to larger increasing times of dynamic compressive strength, and there is an exponential correlation between dynamic compressive strength of CPB and strain rate.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Baofeng Huang, Xiangfei Zhang, Xiaofeng Ma
Summary: The uniaxial compression behavior of building sandstone at high strain rates is investigated using dynamic and static compression tests. It is found that the static compression strength of flattened cylinders is 50% higher than that of standard cylinders. The study also explores the relationship between strain rate and fracture damage, and analyzes the correlations between dynamic strength, strain rate, and dynamic modulus based on experimental results.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
Bagus Budiwantoro, Muhammad A. Kariem, Burhan Febrinawarta
Summary: This study compares different shear angles and recommends using a shear angle of approximately 5 degrees to achieve the purest shear loading. The flow stress variation among the tests is relatively acceptable, within +/-16.4%.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Review
Materials Science, Composites
Antimo Graziano, Otavio Augusto Titton Dias, Oren Petel
Summary: This review categorizes different types of polymer composites, explains their failure behavior under different loads, and discusses experimental methods for characterizing their dynamic mechanical performance. The focus is on the compressive and tensile strength and modulus of polymer composites at high strain rates, compared with data under quasi-static conditions, with explanations for the differences.
POLYMER COMPOSITES
(2021)
Article
Nanoscience & Nanotechnology
Janis S. Kimm, Jim A. Bergmann, Florian Woeste, Fabian Poehl, Petra Wiederkehr, Werner Theisen
Summary: This research conducted Split-Hopkinson pressure bar tests on quenched and tempered steel 42CrMo4 in different heat-treatment conditions to explore the deformation characteristics and the influence of microstructure on deformation. It provides a detailed understanding of the deformation of 42CrMo4 steel under various parameter values.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Biotechnology & Applied Microbiology
Ruoxun Fan, Jie Liu, Zhengbin Jia
Summary: This study aims to explore a suitable strain judging criterion for compressive fracture simulation on the rat femoral cortical bone based on continuum damage mechanics. The results show that the fracture parameters predicted using the principal strain are closer to the experimental values than those predicted using the equivalent strain. Therefore, applying the principal strain can improve the accuracy of compression fracture simulation.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Mostafa Hassan, Kay Wille
Summary: This paper investigates the dynamic tensile behavior of steel fiber reinforced ultra-high performance concrete (SF-UHPC) under impact loading. The study designs a modified split Hopkinson tensile bar (SHTB) to obtain the dynamic behavior of SF-UHPC with different fiber volume fractions. The results provide average dynamic impact factors and suggest an equation to calculate the DIF of the tensile strength of SF-UHPC.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Construction & Building Technology
Kavita Ganorkar, M. D. Goel, Tanusree Chakraborty
Summary: Basalt fiber-reinforced concrete (BFRC) was dynamically characterized using a split Hopkinson pressure bar (SHPB), showing an increase in concrete strength with increasing strain rates. The dynamic increase factor (DIF) was found to range from 0.91 to 3.58 at different strain rates.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Zoology
Carmen Nacarino-Meneses, Anusuya Chinsamy
Summary: The study found that the life-history events of the African hipparionine Eurygnathohippus hooijeri were delayed, likely as an adaptation to a low adult extrinsic mortality and low juvenile survival rates, with fast bone growth possibly due to a high-quality diet and abundant water sources. Combining bone and dental histology in research is crucial for obtaining refined paleobiological information about extinct vertebrates.
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
(2022)
Article
Geology
Roy E. Smith, Anusuya Chinsamy, David M. Unwin, Nizar Ibrahim, Samir Zouhri, David M. Martill
Summary: New finds of small-very small pterosaurs from the mid-Cretaceous Kem Kem Group of Morocco suggest sampling biases in the data on which size distribution patterns are based. The data shows an extension of pterosaur size range from very small to giant forms in the Cretaceous, rather than a switch to large and giant sizes.
CRETACEOUS RESEARCH
(2022)
Article
Paleontology
Mohd Shafi Bhat, Christen D. Shelton, Anusuya Chinsamy
Summary: The bone histology of dinocephalian taxa from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa shows fast osteogenesis with fibrolamellar bone, but growth marks indicate periodic growth arrests. Ontogenetic differences are observed among specimens, with some showing continuous fast growth and others indicating maturity before death. Taxon-specific histological variations suggest slight differences in growth trajectories, with herbivorous and omnivorous taxa possibly having semi-aquatic habits while the carnivorous taxa being more terrestrial.
PAPERS IN PALAEONTOLOGY
(2022)
Article
Evolutionary Biology
German Montoya-Sanhueza, Radim Sumbera, Nigel C. Bennett, Anusuya Chinsamy
Summary: This study found two different proximal femoral morphologies in the naked mole-rat, Heterocephalus glaber, while other bathyergids exhibit a separated condition. The presence of two femoral morphologies in H. glaber may be due to developmental plasticity and slow skeletal growth rates.
JOURNAL OF MAMMALIAN EVOLUTION
(2022)
Article
Biodiversity Conservation
Aurore Canoville, Anusuya Chinsamy, Delphine Angst
Summary: This study investigates whether bone microanatomy can be used to infer the locomotion mode of large terrestrial birds and provides new insights into the histological diversity and growth strategies of flightless birds. The results show that extinct graviportal birds have thicker diaphyseal cortices and more bony trabeculae in the medullary region compared to cursorial birds. Growth marks and outer circumferential layers are also observed in the cortices of extant ratites. The high incidence of pathologies in modern ratites is attributed to their long lifespan.
Article
Biology
German Montoya-Sanhueza, Gabriel Saffa, Radim Sumbera, Anusuya Chinsamy, Jennifer U. M. Jarvis, Nigel C. Bennett
Summary: Naked mole-rats, the least anatomically specialized bathyergid for scratch-digging, show distinct differences in limb structure compared to other bathyergids and fossorial mammals. Strong functional and developmental constraints are driving the selection of limb specializations in most bathyergids, while the pressures on naked mole-rat limbs are relatively relaxed. Historical, developmental, and ecological factors are hypothesized to have played important roles in shaping the appendicular phenotype of the naked mole-rats.
COMMUNICATIONS BIOLOGY
(2022)
Article
Anatomy & Morphology
Catherine A. Forster, William J. de Klerk, Karen E. Poole, Anusuya Chinsamy-Turan, Eric M. Roberts, Callum F. Ross
Summary: A new iguanodontian dinosaur from the Early Cretaceous Kirkwood Formation in Eastern Cape Province, South Africa is named and described. This dinosaur is one of the only two known ornithopod dinosaurs from the Cretaceous period in southern Africa and is unique in its representation primarily by hatchling to young juvenile individuals, as shown by bone histological analysis. The bonebed from which the juvenile material of this new taxon was recovered suggests a change in environment to a drier and more seasonal climate, indicating possible seasonal mortality from a nesting site or nesting grounds linked to this environmental shift.
ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY
(2023)
Article
Anatomy & Morphology
Anusuya Chinsamy, Warren D. Handley, Trevor H. Worthy
Summary: Based on the osteohistological study of Dromornis stirtoni, it is found that this species had a slow growth rate and took several decades to reach adult body size. The growth strategy of D. stirtoni differed from its Pleistocene relative Genyornis newtoni, suggesting adaptation to different environmental conditions. The presence of female specimens and evidence of sexual maturity in D. stirtoni were also identified. D. stirtoni had lower reproductive potential compared to Genyornis newtoni.
ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY
(2023)
Article
Ecology
German Montoya-Sanhueza, Nigel C. Bennett, Anusuya Chinsamy, Radim Sumbera
Summary: The burrowing adaptations of African mole-rats' appendicular systems were investigated to assess the effects of different digging modes and social systems on morphology. The study found that most mole-rats have highly specialized fossorial traits, with chisel-tooth diggers being equally or more specialized than scratch-diggers. However, one species (Heterocephalus glaber) presented a surprisingly less specialized fossorial morphology.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2022)
Article
Geosciences, Multidisciplinary
Megan Rose Woolley, Anusuya Chinsamy, Michael Wayne Caldwell
Summary: Multiple mosasaur remains, including jaw fragments, frontal bones, muzzle unit, and vertebra, have been discovered in South Africa. Through morphological description and taxonomic interpretation, it has been determined that these fossils represent at least three different mosasaur taxa.
FRONTIERS IN EARTH SCIENCE
(2022)
Review
Anatomy & Morphology
Juan Marcos Jannello, Anusuya Chinsamy
Summary: Life history traits can be reconstructed by analyzing the histology of long bones, including growth rate, age at maturity, and age at death. In this study, we examined the long bones of Sivatherium hendeyi and Giraffa cf. Giraffa jumae from the Miocene-Pliocene locality of Langebaanweg in South Africa. Our analysis of the bone histology and growth marks revealed variations in tissue types and vascular canal orientation during ontogeny and across different skeletal elements. Most of the specimens appeared to still be growing, with only one adult metacarpal of S. hendeyi showing skeletal maturity. The growth marks preserved in the bone cortices are likely associated with multiple catastrophic events rather than being annual or seasonal.
JOURNAL OF ANATOMY
(2023)
Article
Paleontology
Anusuya Chinsamy, Karen H. Black, Suzanne J. Hand, Michael Archer
Summary: Despite the lack of osteohistology studies on extinct marsupials, researchers conducted a study on the bone histology of Nimbadon lavarackorum from Australia. They found that it took at least 7-8 years, possibly longer, for N. lavarackorum to reach skeletal maturity. The growth strategy in N. lavarackorum was cyclical and influenced by environmental conditions, available resources, and seasonal physiological factors.
JOURNAL OF PALEONTOLOGY
(2023)
Article
Multidisciplinary Sciences
Mohd Shafi Bhat, Anusuya Chinsamy, John Parkington
Summary: This study investigated the tibial microstructure of modern and fossil angulate tortoises and found evidence of different growth rates and adaptations to the Paleoenvironment. The early ontogeny of tortoises showed fast growth with highly vascularized bone tissue, while later stages had slower growth and even periods of growth cessation. Fossil specimens from cooler and drier late Miocene-early Pliocene environments exhibited slower growth rates and extensive remodelling compared to their modern counterparts in more favorable climates.
ROYAL SOCIETY OPEN SCIENCE
(2023)
Review
Biology
Anusuya Chinsamy
Summary: This article emphasizes the importance of using the microanatomy and microscopic structure of bones to infer the evolution and diversification of species in prehistoric environments. It discusses the presence of growth marks in bones and their usefulness in determining the developmental status and age of individuals, as well as assessing the growth dynamics of individuals and species. Osteohistology provides insight into the structure of past populations and ecological relationships between individuals. The article also examines the response of bones to trauma, disease, and moulting. Lastly, the author explores how osteohistology can shed light on ecomorphological adaptations such as filter feeding, probe feeding, and saltatorial locomotion. Methodological advances in three-dimensional microtomography and synchrotron scanning offer promise for future studies in osteohistology, circumventing the issue of destructive analyses.
Proceedings Paper
Automation & Control Systems
R. Gast, P. S. Els, D. N. Wilke, S. Kok, T. R. Botha
Summary: Tyre forces, especially at lower speeds, are crucial for vehicle safety systems like ABS and stability control, but measuring or predicting them is difficult. An intelligent tyre developed at the University of Pretoria uses stereovision cameras to measure inner tyre deformations, but a model to predict external forces from these measurements is yet to be developed. This study examines the feasibility of predicting external tyre loadings from inner tyre deformations.
VEHICLE AND AUTOMOTIVE ENGINEERING 4, VAE2022
(2023)
Article
Materials Science, Biomaterials
Mohammadreza Kasravi, Alireza Yaghoobi, Tahereh Tayebi, Mahsa Hojabri, Abdolkarim Talebi Taheri, Fatemeh Shirzad, Bahram Jambar Nooshin, Radman Mazloomnejad, Armin Ahmadi, Fatemeh A. Tehrani, Ghasem Yazdanpanah, Mohammad Hadi Farjoo, Hassan Niknejad
Summary: As a promising approach in translational medicine, the decellularization of discarded livers to produce bioscaffolds that support recellularization has potential in overcoming the limitations of conventional liver transplantation. In this study, the researchers investigated the use of matrix metalloproteinase (MMP) inhibition to preserve the extracellular matrix (ECM) during liver decellularization. The results demonstrated that the application of an MMP inhibitor significantly improved the preservation of ECM components and mechanical properties of the bioscaffolds, which supported cell viability and function in vitro. The study also confirmed that the MMP inhibition led to the inhibition of MMP2 and MMP9, providing a novel method to enhance ECM preservation during liver decellularization.
BIOMATERIALS ADVANCES
(2024)
Article
Materials Science, Biomaterials
Mohammadsadegh Nadimifar, Weiguang Jin, Clara Coll-Satue, Gizem Bor, Paul Joseph Kempen, Ali Akbar Moosavi-Movahedi, Leticia Hosta-Rigau
Summary: This study presents a metal-phenolic self-assembly approach that can prepare nanoparticles fully made of hemoglobin. The nanoparticles exhibit good oxygen binding and releasing capabilities.
BIOMATERIALS ADVANCES
(2024)
Article
Materials Science, Biomaterials
Jyoti Kumari, Roel Hammink, Jochem Baaij, Frank A. D. T. G. Wagener, Paul H. J. Kouwer
Summary: Fibrosis is the formation of fibrous connective tissue in response to injury, leading to organ dysfunction. A novel hybrid hydrogel combining synthetic polyisocyanide with hyaluronic acid has been developed, showing strong antifibrotic properties.
BIOMATERIALS ADVANCES
(2024)
Letter
Materials Science, Biomaterials
Melissa Machado Rodrigues, Cristian Padilha Fontoura, Charlene Silvestrin Celi Garcia, Sandro Tomaz Martins, Joao Antonio Pegas Henriques, Carlos Alejandro Figueroa, Mariana Roesch Ely, Cesar Aguzzoli
BIOMATERIALS ADVANCES
(2024)
Article
Materials Science, Biomaterials
Jessica Polak, David Sachs, Nino Scherrer, Adrian Suess, Huan Liu, Mitchell Levesque, Sabine Werner, Edoardo Mazza, Gaetana Restivo, Mirko Meboldt, Costanza Giampietro
Summary: Human skin equivalents (HSEs) play a crucial role in tissue engineering. This study introduces a 3D-printed culture insert to apply a static radial constraint on HSEs and examines its effects on tissue characteristics. The results show that the diameter of the culture insert significantly influences tissue contraction, fibroblast and matrix organization, keratinocyte differentiation, epidermal stratification, and basement membrane formation. This study provides important insights for the design of skin tissue engineering.
BIOMATERIALS ADVANCES
(2024)
Review
Materials Science, Biomaterials
Shiliang Chen, Tianming Du, Hanbing Zhang, Jing Qi, Yanping Zhang, Yongliang Mu, Aike Qiao
Summary: This paper reviewed the primary methods for improving the overall properties of biodegradable zinc stents. It discussed the mechanical properties, degradation behavior, and biocompatibility of various improvement strategies. Alloying was found to be the most common, simple, and effective method for improving mechanical properties. Deformation processing and surface modification further improved the mechanical properties and biological activity of zinc alloys. Meanwhile, structural design could endow stents with special properties. Manufacturing zinc alloys with excellent properties and exploring their interaction mechanism with the human body are areas for future research.
BIOMATERIALS ADVANCES
(2024)