Article
Engineering, Mechanical
Kapil Bharadwaj Bhagavathula, Christopher S. Meredith, Simon Ouellet, Dan L. Romanyk, James David Hogan
Summary: This study presents a comprehensive experimental investigation on the evolution of Poisson's ratio and tangent modulus of polymeric foams during rate-dependent uniaxial compression. The compressive stress-strain response is predicted using the Avalle model and the coefficients follow a power-law scaling across strain rates. The comparison between stress-strain curves, mechanical property evolution, and microstructural parameters provides insights into damage accumulation mechanisms in the material.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Review
Engineering, Multidisciplinary
Foad Rahimidehgolan, William Altenhof
Summary: Polymeric foams are widely used in various industries due to their excellent thermal and mechanical properties. However, their dynamic material characterization is crucial for safe and optimum design, especially in the transportation industry where large deformation at high loading rates can occur. The Split Hopkinson Pressure Bar (SHPB) apparatus is commonly used for experimental investigations, but there are challenges in testing foams. Developing new or modifying current dynamic testing apparatuses remains an open challenge.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Polymer Science
Houqi Yao, Yuezhao Pang, Xin Liu, Jia Qu
Summary: The compressive responses of PVC foams with different densities were investigated under both quasi-static and high strain rate conditions. The results show that the mechanical properties of the foam materials are related to their density and are strain rate-sensitive.
Article
Materials Science, Multidisciplinary
Xinfu Wang, Ying Huang, Xingfu Wang, Weiguo Wang, Gangling Hao, Dan Wang
Summary: The effects of pore density and matrix on the quasi-static and dynamic compressive behaviors of high porosity open-cell aluminum foams were investigated. It was found that pore density has little impact on the collapse strength of the samples under quasi-static conditions, but the collapse strength decreases with increasing pore density at higher strain rates. Different matrix materials also exhibit distinct strain rate response characteristics, which are attributed to their respective microstructures. The strain-rate sensitivity is mainly influenced by the micro-inertia effect caused by the larger aspect ratio of the cell edges, as confirmed by the transverse elongation of the dynamic compression samples. The energy absorption capacity is also discussed in this study.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Sport Sciences
Huw Rees, Ulrik McCarthy Persson, Eamonn Delahunt, Colin Boreham, Catherine Blake
Summary: This study investigated the epidemiological characteristics of contact injuries in field hockey. Data collected from self-reported injuries and injuries reported by physiotherapists showed that 107 contact injuries occurred, accounting for 33.1% of all injuries. Athletes had an absolute risk of 0.372 of sustaining a contact injury. Rule changes mandating the use of personal protective equipment may help reduce the absolute risk and severity of contact injuries in field hockey.
JOURNAL OF SPORTS SCIENCES
(2023)
Article
Biotechnology & Applied Microbiology
Johanna Boutillier, Venetia Cardona, Pascal Magnan, Michael Ogier, Sebastien De Mezzo, Florent Montespan, William Menini, Joel Mosnier, Pierre Naz, Nicolas J. Prat
Summary: Exposure to blast is a major cause of death and disability in recent military conflicts. This study investigates the protective capability of ballistic-proof equipment, focusing on thoracic protective equipment (TPE). The results show that using ceramic hard plates can decrease the severity of blast-induced lung injuries, while using soft body armor may lead to more severe lung injuries. The force and force impulse data obtained from BOPMAN are well correlated with the level of blast-induced lung injury.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Polymer Science
Mohammad Nourmohammadi, Reza Jahanmardi, Hamid Moeenfard, Gholam Hossein Zohuri, Saeed Bazgir
Summary: The objective of this research is to propose new polymer composites with optimal acoustic properties. By using the Taguchi method, ethylene-vinyl acetate foam as the base polymer, and nano materials as additional ingredients, foam materials with superior acoustic properties have been successfully manufactured.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Review
Emergency Medicine
Ankit Kumar Sahu, Soorya Suresh, Roshan Mathew, Praveen Aggarwal, Jamshed Nayer
Summary: This study assessed the impact of personal protective equipment (PPE) on chest compressions during CPR, showing a significant decrease in CC rate and depth with the use of PPE. The proportion of adequate CC rate and depth were also significantly reduced in the PPE arm compared to the no-PPE arm. Newer ways to deliver chest compression need to be explored to maintain quality CPR.
AMERICAN JOURNAL OF EMERGENCY MEDICINE
(2021)
Article
Materials Science, Multidisciplinary
K. B. Bhagavathula, C. S. Meredith, S. Ouellet, S. S. Satapathy, D. L. Romanyk, J. D. Hogan
Summary: This study aimed to investigate the combined influence of density, microstructure, and strain rate on the compressive stress-strain response of polymeric foams. Through quantifying microstructural parameters and conducting experiments at different strain rates, the results showed that mechanical properties exhibited power-law relationships with strain rate across all densities.
EXPERIMENTAL MECHANICS
(2022)
Article
Multidisciplinary Sciences
Kuebra Mehel Metin, Cemile Sencer Semerciog, Cigdem Ataman Hatipoglu, Hueseyin Esmer, Hatice Kayretli, Levent Ertugru lInan, Sami Kinikli, Tahir Kurtulus Yoldas
Summary: During the COVID-19 pandemic, 66.22% of healthcare workers reported new-onset headaches associated with personal protective equipment. These equipment-related headaches were associated with female sex, a history of COVID-19 disease, and the presence of primary headaches diagnosed before the pandemic.
Article
Multidisciplinary Sciences
Zois Tsinas, Ran Tao, Amanda L. Forster
Summary: This study utilized solution blow spinning (SBS) technology to fabricate nanocomposite fiber mats, exploring the effects of critical parameters and providing guidance for optimizing the experimental setup.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2021)
Article
Engineering, Mechanical
Z. P. Sun, Y. B. Guo, V. P. W. Shim
Summary: Additive manufacturing techniques allow for the fabrication of polymeric lattice structures with complex cell architectures. However, the layer-wise fabrication process introduces angle-dependent properties, leading to different mechanical responses in lattices depending on the loading direction. This study investigates how the angle of printing influences the tensile material properties of cell strut material, both in static and dynamic conditions. The results show that the rate-sensitivity of the material depends on the printing angle, and the load-deformation responses and lattice crushing patterns differ significantly when subjected to compression along different directions.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Chemistry, Physical
Amina Turki, Bruno Guelorget, Virgil Optasanu, Manuel Francois, Frederic Herbst, Nabil Njah
Summary: This study aims to produce a highly twinned microstructure in a Cu-6 wt % Zn alloy with a moderate stacking fault energy (SFE) using equal channel angular pressing (ECAP). The results show that a high density of defects is stored after 2 passes of ECAP, followed by recovery. EBSD imaging reveals a high density of twins and a fibrous microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Pharmacology & Pharmacy
J. Meynard, F. Amado-Becker, P. Tchoreloff, V Mazel
Summary: The study utilized impulse excitation technique as a convenient method for characterizing viscoelasticity by detecting damping peak enlargements on resonance spectra. It was found that this method provided reproducible results for the damping ratio, with other influencing factors such as viscoplasticity, porosity, and tablet dimensions considered negligible. The damping ratios determined were in good accordance with the known viscoelastic behavior of the studied products, confirming that impact resonance is an easy and quick way to characterize the viscoelastic nature of pharmaceutical tablets.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2022)
Article
Engineering, Biomedical
Cinzia Peruzzi, Rajaprakash Ramachandramoorthy, Alexander Groetsch, Daniele Casari, Philippe Gronquist, Markus Rueggeberg, Johann Michler, Jakob Schwiedrzik
Summary: The study found that the mechanical response of lamellar bone at the micrometer scale is similar to that at the macro scale, indicating that strain rate sensitivity is an intrinsic property of the bone extracellular matrix. Significant shear band thickening was observed at high strain rates, suggesting that the bone material is unable to accommodate the imposed deformation.
ACTA BIOMATERIALIA
(2021)