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Journal articles on the topic 'Dynamic microindentation'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Ramakers-van Dorp, Esther, Thomas Haenel, Dominik Ciongwa, Bernhard Möginger, and Berenika Hausnerova. "Development of an Advanced Dynamic Microindentation System to Determine Local Viscoelastic Properties of Polymers." Polymers 11, no. 5 (2019): 833. http://dx.doi.org/10.3390/polym11050833.

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This study presents a microindentation system which allows spatially resolved local as well as bulk viscoelastic material information to be obtained within one instrument. The microindentation method was merged with dynamic mechanical analysis (DMA) for a tungsten cone indenter. Three tungsten cone indenters were investigated: tungsten electrode, tungsten electrode + 2% lanthanum, and tungsten electrode + rare earth elements. Only the tungsten electrode + 2% lanthanum indenter showed the sinusoidal response, and its geometry remained unaffected by the repeated indentations. Complex moduli obta

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2

Wolfenden, A., RS Polvani, AW Ruff, and EP Whitenton. "A Dynamic Microindentation Apparatus for Materials Characterization." Journal of Testing and Evaluation 16, no. 1 (1988): 12. http://dx.doi.org/10.1520/jte11046j.

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3

Reilly, Matthew A., Gavin Perry, and Nathan Ravi. "A dynamic microindentation device with electrical contact detection." Review of Scientific Instruments 80, no. 1 (2009): 015105. http://dx.doi.org/10.1063/1.3043428.

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4

Guillou, Lionel, Avin Babataheri, Pierre-Henri Puech, Abdul Barakat, and Julien Husson. "Dynamic Monitoring of Cell Mechanical Properties using Profile Microindentation." Biophysical Journal 110, no. 3 (2016): 134a. http://dx.doi.org/10.1016/j.bpj.2015.11.765.

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5

Galli, Matteo, Kerstyn S. C. Comley, Tamaryn A. V. Shean, and Michelle L. Oyen. "Viscoelastic and poroelastic mechanical characterization of hydrated gels." Journal of Materials Research 24, no. 3 (2009): 973–79. http://dx.doi.org/10.1557/jmr.2009.0129.

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Measurement of the mechanical behavior of hydrated gels is challenging due to a relatively small elastic modulus and dominant time-dependence compared with traditional engineering materials. Here polyacrylamide gel materials are examined using different techniques (indentation, unconfined compression, dynamic mechanical analysis) at different length-scales and considering both viscoelastic and poroelastic mechanical frameworks. Elastic modulus values were similar for nanoindentation and microindentation, but both indentation techniques overestimated elastic modulus values compared to homogeneo

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Lehmann, B., J. Sustacha, A. K. Schlarb, K. Friedrich, M. Q. Zhang, and M. Z. Rong. "Microstructural Analysis of SiO2/Polyethylene Nanocomposites on Local and Macroscopic Scales." Advanced Composites Letters 16, no. 2 (2007): 096369350701600. http://dx.doi.org/10.1177/096369350701600201.

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High density polyethylene filled with nano-SiO2 of different face modification and content is investigated by nanoindentation, microindentation, scratching and dynamic mechanical thermal analysis. The results of the nanoindentation are compared with respect to more macroscopic measurements in order to obtain information if the surface modification and/or the filler content significantly changes the material properties on a local scale.

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7

Boudoukha, H., and S. Djabi. "Superficial tribological transformation of a ferritic stainless steel by dynamic microindentation." Natural Science 05, no. 11 (2013): 1199–202. http://dx.doi.org/10.4236/ns.2013.511147.

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8

Uzun, Orhan, Uğur Kölemen, Selahattin Çelebi, and Nusret Güçlü. "Modulus and hardness evaluation of polycrystalline superconductors by dynamic microindentation technique." Journal of the European Ceramic Society 25, no. 6 (2005): 969–77. http://dx.doi.org/10.1016/j.jeurceramsoc.2004.03.031.

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9

Martin, B., J. M. Pereña, J. M. Pastor, and J. A. De Saja. "Microindentation hardness and dynamic mechanical moduli in polypropylene near the glass transition." Journal of Materials Science Letters 5, no. 10 (1986): 1027–28. http://dx.doi.org/10.1007/bf01730272.

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Chinh, Nguyen Q., Gy Horváth, Zs Kovács, A. Juhász, Gy Bérces, and J. Lendvai. "Kinematic and dynamic characterization of plastic instabilities occurring in nano- and microindentation tests." Materials Science and Engineering: A 409, no. 1-2 (2005): 100–107. http://dx.doi.org/10.1016/j.msea.2005.04.057.

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11

Menichetti, Andrea, David B. MacManus, Michael D. Gilchrist, Bart Depreitere, Jos Vander Sloten, and Nele Famaey. "Regional characterization of the dynamic mechanical properties of human brain tissue by microindentation." International Journal of Engineering Science 155 (October 2020): 103355. http://dx.doi.org/10.1016/j.ijengsci.2020.103355.

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12

Horváth, Gy, N. Q. Chinh, and J. Lendvai. "Solute concentration dependence of strength and plastic instabilities in Al-Mg alloys." Journal of Materials Research 20, no. 2 (2005): 331–37. http://dx.doi.org/10.1557/jmr.2005.0040.

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Characteristics of the dynamic strain aging (DSA) in the Portevin-Le Chatelier effect are experimentally investigated by dynamic indentation tests and numerically analyzed by using literature models. Experimental results obtained on Al–Mg alloys show that the occurrence and development of the plastic instabilities—serrated indentation—depend strongly on the solute content. During dynamic microindentation tests the amplitude of microhardness drops—similarly to the global hardness—and is changing as a power law function of Mg solute content with an exponent of 2/3. It has been shown that the ter

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13

Gajdošová, Veronika, Milena Špírková, Yareni Aguilar Costumbre, et al. "Morphology, Micromechanical, and Macromechanical Properties of Novel Waterborne Poly(urethane-urea)/Silica Nanocomposites." Materials 16, no. 5 (2023): 1767. http://dx.doi.org/10.3390/ma16051767.

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Morphology, macro-, and micromechanical properties of novel poly(urethane-urea)/silica nanocomposites were analyzed by electron microscopy, dynamic mechanical thermal analysis, and microindentation. The studied nanocomposites were based on a poly(urethane-urea) (PUU) matrix filled by nanosilica, and were prepared from waterborne dispersions of PUU (latex) and SiO2. The loading of nano-SiO2 was varied between 0 (neat matrix) and 40 wt% in the dry nanocomposite. The prepared materials were all formally in the rubbery state at room temperature, but they displayed complex elastoviscoplastic behavi

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14

Shikimaka, Olga, Daria Grabco, Katalin Balázsi, Z. Danitsa, I. Mirgorodscaia, and Csaba Balázsi. "Influence of Microstructure on Mechanical Response of Silicon Nitride Ceramic Composites in Nano-, Micro- and Macro-Volume of Material." Key Engineering Materials 409 (March 2009): 346–49. http://dx.doi.org/10.4028/www.scientific.net/kem.409.346.

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The peculiarities of contact-induced deformation in nano-, micro- and macroscopic scale of silicon nitride ceramic composites have been studied by using quasistatic macro- and microindentation techniques, dynamic nanoindentation technique and microstructure investigations. The addition of multiwall carbon nanotubes (MWCNTs) to the ceramic matrix showed the modification of microstructure leading to the modification of mechanical behavior of material: increase of fracture toughness along with the decrease of hardness. The general tendency of hardness increase with decrease of deformation volume

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15

Soares, Priscilla Barbosa Ferreira, Sarah Arantes Nunes, Sinésio Domingues Franco, Raphael Rezende Pires, Darceny Zanetta-Barbosa, and Carlos José Soares. "Measurement of Elastic Modulus and Vickers Hardness of Surround Bone Implant Using Dynamic Microindentation - Parameters Definition." Brazilian Dental Journal 25, no. 5 (2014): 385–90. http://dx.doi.org/10.1590/0103-6440201300169.

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The clinical performance of dental implants is strongly defined by biomechanical principles. The aim of this study was to quantify the Vicker's hardness (VHN) and elastic modulus (E) surround bone to dental implant in different regions, and to discuss the parameters of dynamic microindantion test. Ten cylindrical implants with morse taper interface (Titamax CM, Neodent; 3.5 mm diameter and 7 mm a height) were inserted in rabbit tibia. The mechanical properties were analyzed using microhardness dynamic indenter with 200 mN load and 15 s penetration time. Seven continuous indentations were made

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16

Dehghan, Mina, Travis Casagrande, Priti Wanjara, Javad Gholipour, and Ahmed A. Tiamiyu. "Dynamic recrystallization during microindentation: A site-specific study of indents using a novel LaserFIB method." Materials Science and Engineering: A 933 (June 2025): 148264. https://doi.org/10.1016/j.msea.2025.148264.

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17

Zaimova, Diana, Emin Bayraktar, Ibrahim Miskioglu, Dhurata Katundi, and Nikolay Dishovsky. "New Design of Composite Materials Based on Scrap Rubber Matrix Reinforced with Epoxy and SiC." Advanced Materials Research 939 (May 2014): 114–21. http://dx.doi.org/10.4028/www.scientific.net/amr.939.114.

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The aim of this study is to examine the influence of the scrap material and the additional elements on the structure and mechanical properties of multi-phase system. All of the composites were fabricated by mixing during 4h and then put in an ultrasonic dispersion for 1h. After that, a detail analyses are carried out by the means of Dynamic Mechanical Thermal Analysis (DMTA), Microindentation and scratch test. The structure was investigated by Scanning Electron Microscopy (SEM). The present study will help to optimize the parameters of this newly designed composite material allowing to find di

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18

Kren, A. P., M. N. Delendik, T. A. Pratasenya, and I. Y. Kinzhagulov. "Application of the impact microindentation method for estimation of the mechanical characteristics and defects of the structure of carbon-base composites." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 63, no. 4 (2019): 469–77. http://dx.doi.org/10.29235/1561-8358-2018-63-4-469-477.

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The problems of measurement the physical and mechanical properties of carbon materials by the dynamic microindentation method are considered. The description of the gage design for measurements is given. This gage allows creating different initial energy for straining of the material tested. It is shown that the design of the gage and the device allows testing both integral (in a large volume of straining) values of the hardness and the elastic modulus, and values of these characteristics for different structural components of the carbon-carbon composites materials: carbon rods and pitch. The

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19

Bolz, Philipp, Philipp Drechsel, Alexey Prosvetov, Pascal Simon, Christina Trautmann, and Marilena Tomut. "Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets." Shock and Vibration 2021 (September 17, 2021): 1–11. http://dx.doi.org/10.1155/2021/8825142.

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Targets of isotropic graphite and hexagonal boron nitride were exposed to short pulses of uranium ions with ∼1 GeV kinetic energy. The deposited power density of ∼3 MW/cm³ generates thermal stress in the samples leading to pressure waves. The velocity of the respective motion of the target surface was measured by laser Doppler vibrometry. The bending modes are identified as the dominant components in the velocity signal recorded as a function of time. With accumulated radiation damage, the bending mode frequency shifts towards higher values. Based on this shift, Young’s modulus of irradiated i

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20

Zaimova, Diana, E. Bayraktar, Ming Jen Tan, and Ibrahim Miskioglu. "Processing of Epoxy-Nickel Matrix Composites Reinforced with Aluminum and Waste Elastomers." Advanced Materials Research 939 (May 2014): 98–105. http://dx.doi.org/10.4028/www.scientific.net/amr.939.98.

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A mixture of structural functions can be accomplished using different reinforcements in epoxy-nickel matrix composites. In the frame of the common research project, mechanical and physical properties of the epoxy resin-nickel matrix composites containing extremely fin aluminum and fine waste elastomer powders were studied. A comprehensive study is given with different static and dynamic aspects as a function of composition, frequency and temperature. Two types of waste elastomeric powders were used for the reinforcement: Styrene-Butadyene Rubber SBR and Ethylene Vinyl Acetate (EVA). All of the

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21

Slouf, Miroslav, Beata Strachota, Adam Strachota, Veronika Gajdosova, Vendulka Bertschova, and Jiri Nohava. "Macro-, Micro- and Nanomechanical Characterization of Crosslinked Polymers with Very Broad Range of Mechanical Properties." Polymers 12, no. 12 (2020): 2951. http://dx.doi.org/10.3390/polym12122951.

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This work is focused on the comparison of macro-, micro- and nanomechanical properties of a series of eleven highly homogeneous and chemically very similar polymer networks, consisting of diglycidyl ether of bisphenol A cured with diamine terminated polypropylene oxide. The main objective was to correlate the mechanical properties at multiple length scales, while using very well-defined polymeric materials. By means of synthesis parameters, the glass transition temperature (Tg) of the polymer networks was deliberately varied in a broad range and, as a result, the samples changed their mechanic

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22

Kucher, Michael, Martin Dannemann, Niels Modler, Christian Hannig, and Marie-Theres Weber. "Effects of Endodontic Irrigants on Material and Surface Properties of Biocompatible Thermoplastics." Dentistry Journal 7, no. 1 (2019): 26. http://dx.doi.org/10.3390/dj7010026.

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Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, polyether ether ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl)

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23

Gajdosova, Veronika, Beata Strachota, Adam Strachota, et al. "Biodegradable Thermoplastic Starch/Polycaprolactone Blends with Co-Continuous Morphology Suitable for Local Release of Antibiotics." Materials 15, no. 3 (2022): 1101. http://dx.doi.org/10.3390/ma15031101.

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We report a reproducible preparation and characterization of highly homogeneous thermoplastic starch/pol(ε-caprolactone) blends (TPS/PCL) with a minimal thermomechanical degradation and co-continuous morphology. These materials would be suitable for biomedical applications, specifically for the local release of antibiotics (ATB) from the TPS phase. The TPS/PCL blends were prepared in the whole concentration range. In agreement with theoretical predictions based on component viscosities, the co-continuous morphology was found for TPS/PCL blends with a composition of 70/30 wt.%. The minimal ther

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24

Knob, Antonin, Jaroslav Lukes, Lawrence Drzal, and Vladimir Cech. "Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites." Fibers 6, no. 3 (2018): 58. http://dx.doi.org/10.3390/fib6030058.

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Compatible interlayers must be coated on reinforcing fibers to ensure effective stress transfer from the polymer matrix to the fiber in high-performance polymer composites. The mechanical properties of the interlayer, and its interfacial adhesion on both interfaces with the fiber and polymer matrix are among the key parameters that control the performance of polymer composite through the interphase region. Plasma-synthesized interlayers, in the form of variable materials from polymer-like to glass-like films with a Young’s modulus of 10–52 GPa, were deposited on unsized glass fibers used as re

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25

Smirnov, Alexander, Evgeniya Smirnova, Dmitry Vichuzhanin, et al. "Determining the Elastic Constants and Thickness of the Interphase in Fiberglass Plastic Composites from Micromechanical and Macromechanical Tests." Journal of Composites Science 9, no. 2 (2025): 54. https://doi.org/10.3390/jcs9020054.

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The aim of this paper is to describe a methodology for determining the elastic constants and thickness of the interphase between matrix and fiber in fiberglass plastic composites from macro- and micromechanical testing. Macromechanical testing is tension of unidirectional fiberglass plastics along and across the fiber direction. Micromechanical testing is tension of glass fibers and instrumented microindentation into the matrix and the fiberglass. The interphase thickness is determined by dynamic force microscopy on thin sections without a height difference. The measured interphase thickness i

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26

Santiago, David, Dailyn Guzmán, Francesc Ferrando, Àngels Serra, and Silvia De la Flor. "Bio-Based Epoxy Shape-Memory Thermosets from Triglycidyl Phloroglucinol." Polymers 12, no. 3 (2020): 542. http://dx.doi.org/10.3390/polym12030542.

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A series of bio-based epoxy shape-memory thermosetting polymers were synthesized starting from a triglycidyl phloroglucinol (3EPOPh) and trimethylolpropane triglycidyl ether (TPTE) as epoxy monomers and a polyetheramine (JEF) as crosslinking agent. The evolution of the curing process was studied by differential scanning calorimetry (DSC) and the materials obtained were characterized by means of DSC, thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), stress-strain tests, and microindentation. Shape-memory properties were evaluated under free and totally constrained conditions.

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27

Dias, David, Osmar Santos, Wellington Alves, Milton Lima, and Maria Silva. "Fiber Laser Surface Melting of a NiTi Superelastic Alloy: Influence on Structural and Mechanical Properties." Metals 9, no. 12 (2019): 1268. http://dx.doi.org/10.3390/met9121268.

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The surface melting of a NiTi superelastic alloy using a high-power laser Yb:Fiber was investigated. The influence of this process on the microstructural and mechanical properties was also examined. The reference material was a 3 mm nitinol strip with a homogeneous austenitic B2 phase. For the laser surface melting process, input fluences were applied from 17.5 to 45 J/mm2. The morphology of the structure and the chemical composition of several regions were determined by optical microscopy, scanning electron microscopy, dispersive energy spectra, and X-ray diffraction techniques. The mechanica

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28

Václavek, Lukáš, Jan Tomáštík, and Radim Čtvrtlík. "Effect of Machining on Mechanical Properties of Borosilicate Glasses." Powder Metallurgy Progress 22, no. 1 (2022): 62–74. http://dx.doi.org/10.2478/pmp-2022-0008.

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Abstract Although optical properties are essential for materials for optical purposes, their mechanical properties must also be considered as they directly govern their practical applicability as well as their machining. The machining of optical glasses is mainly carried out by mechanical removal of the material using free or bonded abrasives. The relationship between the local mechanical properties of three types of borosilicate glasses used to produce optical elements (mirrors) and the type of surface machining was investigated. The samples were machined using two approaches, namely 7-axis C

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29

Fominov, E. V., C. G. Shuchev, and M. M. Aliev. "Tribotechnical properties of experimental hard alloys with modified cobalt binder." Advanced Engineering Research 22, no. 1 (2022): 50–56. http://dx.doi.org/10.23947/2687-1653-2022-22-1-50-56.

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Introduction. This paper discusses tribomechanical characteristics of experimental hard alloys with a modified cobalt binder under friction without lubrication on hard-to-cut materials – stainless steel and titanium alloy. The research objective is to evaluate the process of friction interaction for each friction pair according to a number of parameters, and to determine the optimal combinations of “experimental hard alloy – structural material” on the basis of the established tribological indicators.Materials and Methods. Tribological tests of hard alloys were carried out using a cylinder-to-

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30

Zorin, E. E. "Development of rapid diagnostics and prediction of residual life based on detection of accumulated damage of metal structure during sustained loading." Izvestiya MGTU MAMI 7, no. 1-4 (2013): 142–48. http://dx.doi.org/10.17816/2074-0530-67858.

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In the article there are considered the basic principles of the method of rapid diagnostics on the basis of microindentation allowing to register the dynamics of accumulation of scattered damage in a wall of a structure in the sustained loading and predict the residual life.

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31

Boyarskaya, YU S., YU I. Golovin, M. S. Kats, A. I. Tyurin, and A. A. Shibkov. "The electrical phenomena and microindentation dynamics of LiF single crystals." Physica Status Solidi (a) 130, no. 2 (1992): 319–25. http://dx.doi.org/10.1002/pssa.2211300207.

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32

Golovin, Yu I., V. I. Ivolgin, V. V. Korenkov, and A. I. Tyurin. "Dynamics of imprint and dislocation rosette formation by pulsed microindentation of ionic crystals." Physics of the Solid State 39, no. 2 (1997): 278–79. http://dx.doi.org/10.1134/1.1129798.

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33

Шибков, А. А., А. Е. Золотов, А. А. Денисов та М. Ф. Гасанов. "Динамика деформационных полос, инициированных ударом индентора о поверхность алюминий-магниевого сплава". Письма в журнал технической физики 48, № 14 (2022): 26. http://dx.doi.org/10.21883/pjtf.2022.14.52866.19228.

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The dynamics of macrolocalized deformation bands generated by the impact of a Vickers indenter on the surface of an AlMg6 aluminum-magnesium alloy deformed under creep conditions was studied by high-speed video recording and acoustic emission methods. It has been established that these bands are the trigger for the development of a macroscopic jump in plastic deformation on the creep curve. It is shown that in alloys exhibiting the Portevin-Le Chatelier effect, it is necessary to take into account the initiation and propagation of deformation macrobands during surface erosion damage and to est

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34

A.A. Shibkov, A.E. Zolotov, A.A. Denisov, and M.F. Gasanov. "Dynamics of deformation bands initiated by impact of an indenter on the surface of aluminum-magnesium alloy." Technical Physics Letters 48, no. 7 (2022): 66. http://dx.doi.org/10.21883/tpl.2022.07.54043.19228.

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The dynamics of macrolocalized deformation bands generated by the impact of a Vickers indenter on the surface of an AlMg6 aluminum-magnesium alloy deformed under creep conditions was studied by high-speed video recording and acoustic emission methods. It has been established that these bands are the trigger for the development of a macroscopic jump in plastic deformation on the creep curve. It is shown that in alloys exhibiting the Portevin-Le Chatelier effect it is necessary to take into account the initiation and propagation of deformation macrobands during surface erosion damage and to esti

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35

Guillou, L., A. Babataheri, P. H. Puech, A. I. Barakat, and J. Husson. "Dynamic monitoring of cell mechanical properties using profile microindentation." Scientific Reports 6, no. 1 (2016). http://dx.doi.org/10.1038/srep21529.

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36

Reilly, Matthew, and Nathan Ravi. "Microindentation of the Young Porcine Ocular Lens." Journal of Biomechanical Engineering 131, no. 4 (2009). http://dx.doi.org/10.1115/1.3072891.

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Debate regarding the mechanisms of how the eye changes focus (accommodation) and why this ability is lost with age (presbyopia) has recently been rejoined due to the advent of surgical procedures for the correction of presbyopia. Due to inherent confounding factors in both in vivo and in vitro measurement techniques, mechanical modeling of the behavior of the ocular lens in accommodation has been attempted to settle the debate. However, a paucity of reliable mechanical property measurements has proven problematic in the development of a successful mechanical model of accommodation. Instrumente

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37

Wang, Shanling, Ming Zhang, Jodie Bradby, and Pirouz Pirouz. "Static Microindentation and Displacement-Sensitive Indentation Tests on Undoped GaAs." MRS Proceedings 904 (2005). http://dx.doi.org/10.1557/proc-0904-bb05-08.

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AbstractStatic microindentation as well as dynamic displacement-sensitive indentation (DSI) tests have been performed between RT and 450°C on the (001) surface of undoped GaAs. In the static tests, the 4-fold symmetry reduces to 2-fold symmetry in some studied range of temperatures. The temperature dependence of the indentation diagonal and the crack length has been measured and, from disappearance of indentation cracks, the indentation brittle-to-ductile transition (IBDT) temperature TIBDT has been estimated. It is found that the temperature at which a transition in the energy density in DSI

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38

Tan, Jinzhu, Y. J. Chao, Xiaodong Li, and J. W. Van Zee. "Microindentation Test for Assessing the Mechanical Properties of Silicone Rubber Exposed to a Simulated Polymer Electrolyte Membrane Fuel Cell Environment." Journal of Fuel Cell Science and Technology 6, no. 4 (2009). http://dx.doi.org/10.1115/1.3008030.

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The elastomeric materials used as seals and gaskets in polymer electrolyte membrane (PEM) fuel cells are exposed to acidic environment, humid air, and hydrogen, and subjected to mechanical compressive load. The long-term mechanical and chemical stability of these materials is critical to both sealing and the electrochemical performance of the fuel cell. In this paper, mechanical degradation of two elastomeric materials, Silicone S and Silicone G, which are potential gasket materials for PEM fuel cells, was investigated. Test samples were subjected to various compressive loads to simulate the a

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39

Elkin, Benjamin S., Ashok Ilankova, and Barclay Morrison. "Dynamic, Regional Mechanical Properties of the Porcine Brain: Indentation in the Coronal Plane." Journal of Biomechanical Engineering 133, no. 7 (2011). http://dx.doi.org/10.1115/1.4004494.

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Stress relaxation tests using a custom designed microindentation device were performed on ten anatomic regions of fresh porcine brain (postmortem time <3 h). Using linear viscoelastic theory, a Prony series representation was used to describe the shear relaxation modulus for each anatomic region tested. Prony series parameters fit to load data from indentations performed to ∼10% strain differed significantly by anatomic region. The gray and white matter of the cerebellum along with corpus callosum and brainstem were the softest regions measured. The cortex and hippocampal CA1/CA3 were found

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40

Bolz, Philipp, Philipp Drechsel, Alexey Prosvetov, Pascal Simon, Christina Trautmann, and Marilena Tomut. "Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets." September 18, 2021. https://doi.org/10.1155/2021/8825142.

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Targets of isotropic graphite and hexagonal boron nitride were exposed to short pulses of uranium ions with &sim;1 GeV kinetic energy. The deposited power density of &sim;3 MW/cm³ generates thermal stress in the samples leading to pressure waves. The velocity of the respective motion of the target surface was measured by laser Doppler vibrometry. The bending modes are identified as the dominant components in the velocity signal recorded as a function of time. With accumulated radiation damage, the bending mode frequency shifts towards higher values. Based on this shift, Youn

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41

Atabaki, M. Mazar, and J. Idris. "Partial Transient Liquid Phase Diffusion Bonding of Zircaloy-4 to Stabilized Austenitic Stainless Steel 321 Using Titanium Interlayer." Journal of Manufacturing Science and Engineering 134, no. 1 (2012). http://dx.doi.org/10.1115/1.4005304.

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In this study, an innovative method was applied for bonding Zircaloy-4 to stabilized austenitic stainless steel 321 using an active titanium interlayer. Specimens were joined by partial transient liquid phase diffusion bonding method in a vacuum furnace at different temperatures under 1 MPa dynamic pressure of contact. The influence of different bonding temperatures on the microstructure, microindentation hardness, joint strength, and interlayer thickness has been studied. Additionally, a simple numerical model was developed to predict the evolution of interlayer during partial transient liqui

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Lazzarino, M., S. N. Chen, S. Gao, et al. "Mechanomics study of cardiomyocytes with filamin c truncations." European Heart Journal 44, Supplement_2 (2023). http://dx.doi.org/10.1093/eurheartj/ehad655.3196.

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Abstract Background Filamin C (FLNC) is expressed in cardiomyocytes, where it binds to actin and localizes to Z-discs, sarcolemma, and intercalated discs. Although FLNC truncation variants (FLNCtv) are an established cause of arrhythmias and heart failure (arrhythmogenic cardiomyopathy), the underlying mechanisms, in particular changes in mechanical properties of cardiomyocytes, are mostly unknown. Purpose In this study, we applied a biophysical approach to investigate the interaction between altered mechanical properties and biological response in human induced pluripotent stem cells–derived

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Rezapourdamanab, Sarah, Yamini Singh, Sophia Norton, et al. "Abstract Mo089: Fontan-Associated Liver Disease On A Chip." Circulation Research 135, Suppl_1 (2024). http://dx.doi.org/10.1161/res.135.suppl_1.mo089.

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Introduction: The Fontan procedure is performed in children with single ventricle physiology, and has led to excellent short-term palliation and survival rates but at the cost of long-term complications. Fontan-associated liver disease (FALD) results from hemodynamic changes following the Fontan procedure, leading to elevated central venous pressures, chronic alterations in hepatic perfusion, and resultant hepatic fibrosis. Improved understanding of FALD pathophysiology, which may provide insights for prevention and treatment is challenged by the lack of experimental models. Current in vitro l

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Gionet-Gonzales, Marissa, Gianna Gathman, Jonah Rosas, et al. "Stress relaxation rates of myocardium from failing and non-failing hearts." Biomechanics and Modeling in Mechanobiology, December 31, 2024. https://doi.org/10.1007/s10237-024-01909-4.

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AbstractThe heart is a dynamic pump whose function is influenced by its mechanical properties. The viscoelastic properties of the heart, i.e., its ability to exhibit both elastic and viscous characteristics upon deformation, influence cardiac function. Viscoelastic properties change during heart failure (HF), but direct measurements of failing and non-failing myocardial tissue stress relaxation under constant displacement are lacking. Further, how consequences of tissue remodeling, such as fibrosis and fat accumulation, alter the stress relaxation remains unknown. To address this gap, we condu

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Şopu, Daniel, Florian Spieckermann, Xilei Bian, et al. "Rejuvenation engineering in metallic glasses by complementary stress and structure modulation." NPG Asia Materials 15, no. 1 (2023). http://dx.doi.org/10.1038/s41427-023-00509-5.

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AbstractResidual stress engineering is widely used in the design of new advanced lightweight materials. For metallic glasses, attention has been given to structural changes and rejuvenation processes. High-energy scanning X-ray diffraction strain mapping reveals large elastic fluctuations in notched metallic glasses after deformation under triaxial compression. Microindentation hardness mapping hints at a competing hardening–softening mechanism after compression and reveals the complementary effects of stress and structure modulation. Transmission electron microscopy proves that structure modu

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Ulrich, Anke Silvia, Petra Pfizenmaier, Michael Kerbstadt, et al. "Partitioning and Coarsening Dynamics of Precipitate‐Strengthened Cr‐Si Alloys: The Role of Ge, Pt, and Mo." Advanced Engineering Materials, January 21, 2025. https://doi.org/10.1002/adem.202401818.

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Cr solid solution (Crss) alloys strengthened by A15‐phase precipitates (e.g., Cr3Si) are promising candidates for high‐temperature structural materials. A series of Cr‐base alloys (Cr ≥ 89 at%) with strengthening A15‐phase precipitates consisting of up to five alloying elements is investigated. Scanning electron microscopy with energy‐dispersive X‐ray spectroscopy, electron probe microanalysis with wavelength‐dispersive X‐Ray spectroscopy, X‐ray diffraction, image analysis, and nano‐ and microindentation are used to characterize the interplay of alloying elements on hardness, microstructural p

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Ayee, Manuela A. A., Elizabeth LeMaster, Tzu Pin Shentu, Nicolas Barbera, Belinda S. Akpa, and Irena Levitan. "Modulation of Endothelial Membrane Biomechanics by Oxidized Phospholipids: A Combined Experimental and Computational Approach." FASEB Journal 31, S1 (2017). http://dx.doi.org/10.1096/fasebj.31.1_supplement.629.19.

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Elevated concentrations of biologically active oxidized phospholipids (oxPCs) are known to exert various pathophysiological effects, including disruption of the endothelial barrier and induction of monocyte adhesion to endothelial cells. These effects are further implicated in a range of disorders, including certain cardiovascular, metabolic, and immunological diseases. The specific mechanisms by which oxPCs modulate membrane barrier function are poorly understood.We investigated the differential influence of two bioactive oxidized phospholipids on model bilayer properties, membrane packing, f

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