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Articles de revues sur le sujet « Elastic lifetime »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Zhao, Rongguo, Duheng Ye, Sheng Lin, et al. "Optimization Design and Fatigue Lifetime Analysis for Elastic Wheel of Low-floor Trams Using in Urban Rail Transit." Journal of Physics: Conference Series 2468, no. 1 (2023): 012051. http://dx.doi.org/10.1088/1742-6596/2468/1/012051.

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Abstract Elastic wheel is an important component of the low floor tram using in urban rail transit, so it is of significance to optimize its structure and predict its service lifetime. Firstly, the fatigue characteristics of rubber material are studied based on the crack energy theory, and a finite element model of an elastic wheel for fatigue lifetime prediction is constructed. The numerical simulation results show that the fatigue lifetime of such a elastic wheel does not match with the expected one. Secondly, based on the orthogonal numerical test and the Sobol model, an improved sensitivit

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Parker, A. P., S. N. Endersby, T. J. Bond, J. H. Underwood, S. L. Lee, and J. Higgins. "Stress Concentration, Stress Intensity, and Fatigue Lifetime Calculations in Autofrettaged Tubes Containing Axial Perforations Within the Wall." Journal of Pressure Vessel Technology 119, no. 4 (1997): 488–93. http://dx.doi.org/10.1115/1.2842334.

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Elastic, elastic-plastic and experimental stress analyses, and fatigue lifetime predictions are presented for thick cylinders containing multiple, axial holes within the wall. The holes are generally semi-elliptical (including semi-circular), and the cylinders are autofrettaged after introduction of the holes and are subsequently subjected to cyclic pressurization of the bore. Two potentially critical failure locations are identified; a fracture-mechanics based design methodology is proposed; elastic and elastic-plastic finite element (FE) analyses are undertaken. The elastic FE analysis predi

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Pazdera, Lubos, Libor Topolar, Jaroslav Smutny, and Kristyna Timcakova. "Nondestructive Testing of Advanced Concrete Structure during Lifetime." Advances in Materials Science and Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/286469.

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The paper reports on measurements and analysis of the measurements during hardening and drying of specimens using selected acoustic nondestructive testing techniques. An integrated approach was created for better understanding of the relations between the lifetime cycle and the development of the mechanical properties of concrete. Acoustic emission, impact echo, and ultrasonic techniques were applied simultaneously to the same mixtures. These techniques and results are presented on alkali-activated slag mortars. The acoustic emission method detects transient elastic waves within the material,

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Kondrashov, Oleg V., Timur R. Galimzyanov, Rodion J. Molotkovsky, Oleg V. Batishchev, and Sergey A. Akimov. "Membrane-Mediated Lateral Interactions Regulate the Lifetime of Gramicidin Channels." Membranes 10, no. 12 (2020): 368. http://dx.doi.org/10.3390/membranes10120368.

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The lipid matrix of cellular membranes is an elastic liquid crystalline medium. Its deformations regulate the functionality and interactions of membrane proteins,f membrane-bound peptides, lipid and protein-lipid domains. Gramicidin A (gA) is a peptide, which incorporates into membrane leaflets as a monomer and may form a transmembrane dimer. In both configurations, gA deforms the membrane. The transmembrane dimer of gA is a cation-selective ion channel. Its electrical response strongly depends on the elastic properties of the membrane. The gA monomer and dimer deform the membrane differently;

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Kansy, J., T. Suzuki, T. Ogawa, and M. Murakami. "Study of poly(methylphenylsilylenemethylene) by elastic thermalization lifetime analysis." Radiation Physics and Chemistry 58, no. 5-6 (2000): 545–50. http://dx.doi.org/10.1016/s0969-806x(00)00215-2.

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P, Contreras. "A Tale of the Scattering Lifetime and the Mean Free Path." Physical Science & Biophysics Journal 6, no. 2 (2022): 1–12. http://dx.doi.org/10.23880/psbj-16000225.

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The idea of applying the scattering lifetime calculated from the imaginary part of the zero temperature elastic scattering cross-section to study a hidden self-consistent damping in two spaces of importance for non-equilibrium statistical mechanics is proposed. It is discussed its relation with the classical phase space from statistical mechanics and the configuration space from nonrelativistic quantum mechanics. This idea is contrasted with the mean free path values in three elastic collision regimes. The main exercise is to study the behavior of a self-consistent probabilistic distribution f

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Song, Ming Xin, Rui Wu, Qian Liu, et al. "Reliability Research of Capacitive RF-MEMS Switch." Advanced Materials Research 753-755 (August 2013): 2507–10. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2507.

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This paper presents the model of capacitive RF-MEMS switch for the lifetime prediction. The model is based on dielectric charging failure mechanism. The simulation results show that lifetime can reach 1000 hours when elastic coefficient (K) adopts 4-16N/m, Si3N4 as dielectric material, 0.4-1μm of dielectric thickness, 2-5μm of plate distance, less than 20V of driven voltage.

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Guo, Shiwen, and Jie Yan. "Structural-Elastic Determination of the Lifetime of Biomolecules Under Force." Biophysical Journal 114, no. 3 (2018): 577a. http://dx.doi.org/10.1016/j.bpj.2017.11.3155.

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Parker, A. P., J. H. Underwood, and D. P. Kendall. "Bauschinger Effect Design Procedures for Autofrettaged Tubes Including Material Removal and Sachs’ Method." Journal of Pressure Vessel Technology 121, no. 4 (1999): 430–37. http://dx.doi.org/10.1115/1.2883726.

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Autofrettage is used to introduce advantageous residual stresses into pressure vessels and to enhance their fatigue lifetimes. The Bauschinger effect serves to reduce the yield strength in compression as a result of prior tensile plastic overload and can produce lower compressive residual hoop stresses near the bore than are predicted by “ideal” autofrettage solutions (elastic/perfectly plastic without Bauschinger effect). A complete analysis procedure is presented which encompasses representation of elastic-plastic uniaxial loading material behavior and of reverse-loading material behavior as

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Shlyannikov, Valery, Ivan Ishtyryakov, and Rustam Yarullin. "Life-time prediction for aviation GTE compressor disk based on mixed-mode and multi-axial fracture resistance parameters." MATEC Web of Conferences 300 (2019): 11001. http://dx.doi.org/10.1051/matecconf/201930011001.

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This study is concerned with analysis of fatigue crack growth and life-time prediction for aviation GTE compressor disk under operation conditions. For consideration were different combinations of rotational speed, temperature, surface flaw form and sizes as well as elastic-plastic titanium alloy BT3-1 properties are employed. A crack growth rate equation is derived involving the fracture process zone size and nonlinear stress intensity factor. The assessments of the structural integrity of the rotating disk are compared for elastic and elastic-plastic solutions. It is stated that the traditio

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Brown, M. W. "Aspects of Fatigue Crack Growth." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 1 (1988): 19–29. http://dx.doi.org/10.1243/pime_proc_1988_202_082_02.

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The propagation of fatigue cracks under low levels of cyclic stress can be modelled by linear elastic fracture mechanics. Elastic-plastic parameters must be used for the higher stress amplitudes of conventional S–N curves in both the low and the high cycle fatigue regimes. The occurrence of different modes of crack growth is discussed and the use of a propagation law to predict component lifetime is demonstrated.

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Zhou, Mingjie, Shenghua Zhong, Yiping Liu, et al. "Damage Evolution and Lifetime Prediction of Cement Asphalt Mortar Under High-Speed Train Frequency and Temperature Gradient Load." Materials 18, no. 5 (2025): 1011. https://doi.org/10.3390/ma18051011.

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Severe damage to cement asphalt mortar (CA mortar) can compromise the stability and safety of high-speed railway operations due to various complex factors during service. The loads from high-speed trains and temperature gradients within the ballastless track structure are significant contributors to this damage. However, most previous studies have focused on laboratory tests or numerical simulations under simple loading conditions, while few have investigated the damage evolution of CA mortar when both train loads and temperature gradients are considered simultaneously. In this paper, a finite

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Xing, Zhong Wen, Jun Bao, Xue Chun Li, and Yu Ying Yang. "Micromechanism of Plastic Deformation on Elastic Modulus." Materials Science Forum 546-549 (May 2007): 713–18. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.713.

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The key to enhance the precision of sheet metal stamping parts is accurate prediction and control of the springback. And one of the dominant factors of springback is the elastic modulus. The change of elastic modulus with plastic deformation was experimentally studied for the annealed LY12 and the annealed LF21 aluminum alloy respectively, and the changing role of elastic modulus with plastic deformation was obtained. By inverse pole figure from the X-ray diffraction analysis, the effects of the material original textures and their changing with plastic deformation on the elastic modulus were

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Qian, Jin, Jizeng Wang, and Huajian Gao. "Lifetime and Strength of Adhesive Molecular Bond Clusters between Elastic Media†." Langmuir 24, no. 4 (2008): 1262–70. http://dx.doi.org/10.1021/la702401b.

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Poduška, Jan, Pavel Hutař, Andreas Frank, Gerald Pinter, and Luboš Náhlík. "Lifetime Calculation of Soil-Loaded Non-Pressure Polymer Pipes." Key Engineering Materials 827 (December 2019): 141–46. http://dx.doi.org/10.4028/www.scientific.net/kem.827.141.

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Outstanding durability of plastic pressure and non-pressure pipes can cause difficulties, when a reasonable lifetime estimation is needed. It is impossible to prove the lifetime by testing, but there is a method of calculation that can provide a certain idea about the expected lifetime. The lifetime estimation is based on the assumption that the failure occurs as a result of the slow crack growth mechanism and it is calculated using the linear elastic fracture mechanics approach. Numerical simulations of crack growth in the pipe are necessary for this calculation. These simulations must consid

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Obrubov, S. A., and I. V. Rogozhina. "Approaches to the assessment of biomechanical properties of eye tissues." Russian ophthalmology of children 52, no. 2 (2025): 53–60. https://doi.org/10.25276/2307-6658-2025-2-53-60.

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Abstract This lecture is devoted to some approaches to the assessment of biomechanical properties of eye tissues. Methods based on the doctor’s feelings are presented; experimental methods based on the assessment of elastic-strength parameters in various types of deformation; methods of lifetime assessment (determination of the coefficient of deformation of the sclera, computer tomography of the orbit, acoustic). The advantages and prospects of an acoustic method for assessing the lifetime biomechanical properties of eye tissues are noted. Keywords: biomechanical properties of eye tissues, pal

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Contreras, P., Dianela Osorio, and E. Yu Beliayev. "Dressed behavior of the quasiparticles lifetime in the unitary limit of two unconventional superconductors." Low Temperature Physics 48, no. 3 (2022): 187–92. http://dx.doi.org/10.1063/10.0009535.

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We compare the quasiparticle lifetime behavior in the unitary limit of two unconventional superconductors dressed by nonmagnetic impurity scattering to differentiate an anomalous functional behavior in its shape when the disorder concentration is changed in a triplet paired model with respect to the well behave singlet model. For singlet paired superconductors, the functional shape of the lifetime due to elastic scattering around the nodal regions in the reduced elastic scattering space, does not change with the disorder concentration, but for a triplet model with a tiny gap, an anomalous drop

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18

Chen, Liu Caroline, Zonghe Lai, Zhaonian Cheng, and Johan Liu. "Reliability Investigation for Encapsulated Isotropic Conductive Adhesives Flip Chip Interconnection." Journal of Electronic Packaging 128, no. 3 (2005): 177–83. http://dx.doi.org/10.1115/1.2227057.

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Isotropic conductive adhesives (ICA) are gaining more and more application interests in electronic manufacturing, however, their failure mechanism is not been fully understood. In this paper we present reliability investigations on an encapsulated ICA flip chip interconnection. Experimental work included product lifetime measurement, cross section observation, and whole module warpage scanning. Results revealed that the chip-size effect on the ICA lifetime was obvious. A theoretical analysis was conducted with Finite Element Method (FEM) simulation. Viscoelastic models for adhesives and underf

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Song, Ming Xin, Guo Xu Zheng, and Rui Wu. "Dielectric Charging Failure Analysis of RF-MEMS Switch." Applied Mechanics and Materials 274 (January 2013): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amm.274.170.

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MEMS devices commercialization is hindered by reality problems. Among them main problem is caused by dielectric charging. This paper studies charging model and charges distribution which are constructed on adhesion failure. Lifetime prediction formula is given. Simulation results show that under the condition of low driven voltage requirement, lifetime is bigger than 1000 hours when elastic coefficient (K) adopts 4-16N/m, 0.4-1μm for dielectric thickness, 2-5μm for plate distance and S3iN4 as dielectric material. At last, C-V performances inflected by dielectric charging is studied by theoreti

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Wang, Binjie, Shouguang Sun, Shuang Ma, and Xi Wang. "Fatigue damage and reliability assessment of subway train bogie frames under operating conditions." Advances in Mechanical Engineering 12, no. 1 (2020): 168781402090359. http://dx.doi.org/10.1177/1687814020903590.

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Fatigue cracks developed on subway train bogie frames before reaching the designed lifetime, which poses great challenges to operational safety. This article presents a structural fatigue reliability assessment method combining both the in-service measurement of dynamic stress and probabilistic approach for lifetime prediction. It was found that curved interval with rail corrugation can induce the elastic vibration and the modal stress on the frame, which caused the accelerated accumulation of the fatigue damage. The predicted failure mileage for the welding joint with 99% reliability was only

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Bouaziz, Rami, Laurianne Truffault, Rouslan Borisov, et al. "Elastic Properties of Polychloroprene Rubbers in Tension and Compression during Ageing." Polymers 12, no. 10 (2020): 2354. http://dx.doi.org/10.3390/polym12102354.

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Being able to predict the lifetime of elastomers is fundamental for many industrial applications. The evolution of both tensile and compression behavior of unfilled and filled neoprene rubbers was studied over time for different ageing conditions (70 °C, 80 °C and 90 °C). While Young’s modulus increased with ageing, the bulk modulus remained almost constant, leading to a slight decrease in the Poisson’s ratio with ageing, especially for the filled rubbers. This evolution of Poisson’s ratio with ageing is often neglected in the literature where a constant value of 0.5 is almost always assumed.

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Ghodrati Amiri, Gholamreza, Gholamreza Abdollahzadeh Darzi, and Javad Vaseghi Amiri. "Design elastic input energy spectra based on Iranian earthquakes." Canadian Journal of Civil Engineering 35, no. 6 (2008): 635–46. http://dx.doi.org/10.1139/l08-013.

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The goal of this paper is to propose input energy spectra applicable to seismic design of structures based on Iranian earthquakes. In terms of input energy, these spectra represent the load effects of a strong earthquake that a structure may encounter during its lifetime. For this purpose, from among 1800 existing earthquake records in Iran, 110 records were selected. By using these records and through dynamic response analyses, the design input energy spectra for four ground types, defined by the Iranian earthquake code of practice, have been derived.

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Parker, Anthony P. "A Critical Examination of Sachs’ Material-Removal Method for Determination of Residual Stress." Journal of Pressure Vessel Technology 126, no. 2 (2004): 234–36. http://dx.doi.org/10.1115/1.1689357.

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Sachs’ method is an experimental procedure used primarily in the determination of residual stresses in autofrettaged thick cylinders. In its usual form it involves fixing axial and hoop direction strain gauges to the OD of a tube; strain readings are then obtained after each incremental removal of material from the bore. Sachs’ analysis assumes that the remaining tube unloads in linear-elastic fashion throughout the process and that superposition may therefore be employed to quantify the residual stresses within the original tube. By numerical simulation of two complete Sachs’ experimental seq

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Wild, Johannes, Stefan Wagner, Astrid Pundt, and Stefan Guth. "Influence of Electrolytic Hydrogen Charging and Effusion Aging on the Rotating Bending Fatigue Resistance of SAE 52100 Steel." Corrosion and Materials Degradation 6, no. 3 (2025): 30. https://doi.org/10.3390/cmd6030030.

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Hydrogen embrittlement (HE) can significantly degrade the mechanical properties of steels. This phenomenon is particularly relevant for high-strength steels where large elastic stresses lead to detrimental localized concentrations of hydrogen at defects. In this study, unnotched rotating bending specimens of the bearing steel SAE 52100 (100Cr6) quenched and tempered at 180 °C and 400 °C were electrochemically charged with hydrogen. Charged and non-charged specimens then underwent rotating bending fatigue testing, either immediately after charging or after aging at room temperature up to 72 h.

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Padgett, Elliot, Megan E. Holtz, Anusorn Kongkanand, and David A. Muller. "Strain Relaxation and Activity in PtCo Fuel Cell Catalyst Nanoparticles." ECS Meeting Abstracts MA2023-01, no. 38 (2023): 2259. http://dx.doi.org/10.1149/ma2023-01382259mtgabs.

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Interest is growing in applying fuel cells to heavy duty transportation applications, which requires the fuel cell design to prioritize efficiency and durability to provide a low lifetime cost of ownership. This motivates further development of catalysts for the oxygen reduction reaction (ORR), as ORR kinetics are a key factor in fuel cell efficiency and catalyst degradation is a major factor limiting lifetime. Pt-alloy catalysts have seen success in light-duty fuel cell applications, where they provide enhanced activity believed to originate (at least in part) from strain of the active Pt sur

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Hutař, Pavel, Martin Ševčík, Luboš Náhlík, Adreas Frank, Jaroslav Kučera, and Gerald Pinter. "Numerical Lifetime Prediction of Polymer Pipes Taking into Account Residual Stress." Key Engineering Materials 577-578 (September 2013): 169–72. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.169.

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In this paper a methodology for assessment of residual stress effects on crack behaviour in the polymer pipe is developed. For simplicitys sake, a linear distribution of residual stresses across the pipe wall is assumed. Linear elastic fracture mechanics is used for the fracture mechanics analysis of the cracked pipe. An approximate relation for the stress intensity factor estimation for a crack in a polymer pipe, with residual stress taken into account is suggested and discussed. The methodology presented can be helpful for a rapid lifetime estimation of polyolefin pipelines.

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Bryaskova, R., R. Mateva, N. Djourelov, and M. Krasteva. "Study of multiblock polyamide-6/Poly-(isoprene) copolymers by positron annihilation spectroscopy." Open Chemistry 6, no. 4 (2008): 575–80. http://dx.doi.org/10.2478/s11532-008-0073-9.

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AbstractPositron annihilation lifetime spectroscopy (PALS) has been used to determine the free volume in multiblock polyamide-6/poly-(isoprene) copolymers (PA-6/PI), synthesized via activated anionic bulk copolymerization. The diisocyanate functionalized telechelic PI, blocked with caprolactam (CL) has been used as a commoner and an activator at the same time. The elastic PI block incorporated into the main chain of PA-6 affects the amorphous and crystal phase of the copolymer leading to changing in degree of crystallinity. The positron annihilation lifetime spectroscopy (PAL) and Doppler broa

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Rjelka, Marek, Martin Barth, Sven Reinert, et al. "Third Order Elastic Constants and Rayleigh Wave Dispersion of Shot Peened Aero-Engine Materials." Materials Science Forum 768-769 (September 2013): 201–8. http://dx.doi.org/10.4028/www.scientific.net/msf.768-769.201.

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Aero-engine components exposed to high mechanical stresses are made of high-strength alloys and additionally, they are surface treated by shot peening. This process introduces compressive residual stress into the material making it less sensitive to stress corrosion cracking and fatigue and therefore benefits the components performance and lifetime. Moreover cold work is induced in an amount depending on the peening parameters. To approximate the remaining lifetime, a quantitative, non-destructive method for stress assessment is required. It was shown that surface treatment of such alloys can

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Zhang, Jian-Zhi, David H. Leach, and Richard K. Chang. "Photon lifetime within a droplet: temporal determination of elastic and stimulated Raman scattering." Optics Letters 13, no. 4 (1988): 270. http://dx.doi.org/10.1364/ol.13.000270.

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Qian, Jin, Jizeng Wang, Yuan Lin, and Huajian Gao. "Lifetime and Strength of Periodic Bond Clusters between Elastic Media under Inclined Loading." Biophysical Journal 97, no. 9 (2009): 2438–45. http://dx.doi.org/10.1016/j.bpj.2009.08.027.

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Pietrzak, Ryszard, and Roman Szatanik. "The Effect of Impact Pressure on Positron Lifetime in Ultra High Molecular Weight Polyethylene (PE-UHMW)Chirulen®1120." Materials Science Forum 666 (December 2010): 85–88. http://dx.doi.org/10.4028/www.scientific.net/msf.666.85.

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The paper presents the results of investigations of the effect of impact pressure (in the range of both elastic and plastic deformations) on the parameters of the positron lifetime spectra in PE-UMHW polymer known under the trade mark Chirulen1120. The changes in the long-living component of the positron lifetime spectrum, connected with the annihilation of o-Ps in the pick-off process, are analyzed in dependence on the impact energy. The impact duration in the Charpy’s tests depending on the impact energy was measured, too. The dependencies of the radius of the volume of empty spaces in whic

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Kligman, L. H., J. A. Mezick, R. J. Capetola, and E. G. Thorne. "Lifetime topical application of tretinoin to hairless mice." Acta Dermato-Venereologica 72, no. 6 (1992): 418–22. http://dx.doi.org/10.2340/0001555572418422.

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The discovery that topical tretinoin can reverse some of the effects of photodamage may lead to its chronic application. Examination of long-term effects was of interest. Three groups of hairless mice (age 6-8 weeks) were treated dorsally with 1) tretinoin (0.025%), 2) cream vehicle, 3) sham treatment. Applications were 3 times weekly and continued for up to 2 years until all mice were sacrificed or had died. Biweekly examinations showed no sign of retinoid toxicity, with growth and longevity similar in all groups. Tretinoin-treated skin was smooth and pink, resembling that of younger mice. Co

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Funabashi, Masahiro, Fumi Ninomiya, Akihiro Oishi, et al. "Highly Accelerated Aging Method for Poly(ethylene terephthalate) Film Using Xenon Lamp with Heating System." Journal of Polymers 2016 (April 21, 2016): 1–9. http://dx.doi.org/10.1155/2016/8547524.

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PET films were degraded at temperature higher than 100°C with steam and xenon light by using the newly developed system. Degradation products obtained using the proposed and conventional systems were essentially the same, as indicated by the similar increase in the intensity of the carbonyl peak near 1685 cm−1 in the FT-IR spectra of irradiated specimens and spectrum of original PET film. Elastic moduli derived from the stress-strain (SS) curves obtained in tensile tests were almost the same in the case of the proposed and conventional systems and were independent of the heating temperature, l

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Zivkovic, Miroslav, Snezana Vulovic, and Rodoljub Vujanac. "Assessment of the drum remaining lifetime in thermal power plant." Thermal Science 14, suppl. (2010): 313–21. http://dx.doi.org/10.2298/tsci100507030z.

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In this paper analysis of stress and thermal-elastic-plastic strain of the drum is performed. Influence of modified thickness, yield stress and finite element model of welded joint between pipe and drum on assessment of the remaining lifetime of the drum in the thermal power plant is analyzed. Two analyses are compared. In the first, drum is modeled by shell and by 3D finite elements with projected geometrical and material data of drum. Then, the drum is modeled by shell and by 3D finite elements with modified thickness and yield stress. The analysis show that detailed modeling of stress conce

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Szabó, Dániel. "Linear elastic finite element investigation of titanium specimen produced by Additive Manufacturing." International Journal of Engineering and Management Sciences 4, no. 4 (2019): 85–91. http://dx.doi.org/10.21791/ijems.2019.4.9.

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Nowadays orthopaedic implants are mainly fabricated from solid material (titanium alloy). The mechanical properties of these implants are much stronger than human bone tissue’s properties, and this leads to fixation problems and a short lifetime, but today these problems can be eliminated with the usage of metal additive manufacturing. The mechanical properties of the implants can be influenced on demand with the variation of the material structure using different sizes and types of unit cells for building up its structure.

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Vázquez, Alejandro L., Cynthia M. Navarro Flores, Byron H. Garcia, Tyson S. Barrett, and Melanie M. Domenech Rodríguez. "An ecological examination of early adolescent e-cigarette use: A machine learning approach to understanding a health epidemic." PLOS ONE 19, no. 2 (2024): e0287878. http://dx.doi.org/10.1371/journal.pone.0287878.

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E-cigarette use among adolescents is a national health epidemic spreading faster than researchers can amass evidence for risk and protective factors and long-term consequences associated with use. New technologies, such as machine learning, may assist prevention programs in identifying at risk youth and potential targets for intervention before adolescents enter developmental periods where e-cigarette use escalates. The present study utilized machine learning algorithms to explore a wide array of individual and socioecological variables in relation to patterns of lifetime e-cigarette use durin

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WILKOWSKI, JACEK, MAREK BARLAK, JOANNA WACHOWICZ, ROMAN BOTTGER, and ZBIGNIEW WERNER. "Nano-scale hardness and elastic modulus of WC-Co composites and their relationship to the tools life during particleboard milling." Annals of WULS, Forestry and Wood Technology 106 (January 15, 2019): 62–66. http://dx.doi.org/10.5604/01.3001.0013.7738.

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Nano-scale hardness and elastic modulus of WC-Co composites and their relationship to the tool life during particleboards milling. The paper summarizes the results of the technique of hardness and elastic modulus determination using a load and displacement sensing indentation experiments. During the tests these properties were measured in nano-scale for different types of WC-Co composites using the Anton Paar TriTec Ultra Nano Hardness Tester (UNHT). In addition, durability examination of WC-Co tools during milling of particleboard was carried out. In the final stage, the correlation of the st

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Schwabe, Christian, Niklas Seltner, and Thomas Basler. "Reliability of SiC MOSFETs in the High Cycle Fatigue Regime under Fast Power Pulses." Solid State Phenomena 361 (August 26, 2024): 7–12. http://dx.doi.org/10.4028/p-tr8kum.

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Device reliability is an important factor in application, especially in the field of electric mobility. In this paper high cycle fatigue power cycling results of SiC devices in baseplate free modules are presented. To minimize testing time, the devices were stressed with load pulses corresponding to a 50 Hz load. The reliability results are the first fatigue results for temperature swings below 30 K for SiC devices. The lifetime in the high cycle fatigue area is limited by solder fatigue for high virtual junction temperatures of 150 °C. In theory, the reliability should increase exponential si

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Wang, Yixing, and Benben Jiang. "Attention Mechanism-Based Neural Network for Prediction of Battery Cycle Life in the Presence of Missing Data." Batteries 10, no. 7 (2024): 229. http://dx.doi.org/10.3390/batteries10070229.

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As batteries become widespread applications across various domains, the prediction of battery cycle life has attracted increasing attention. However, the intricate internal mechanisms of batteries pose challenges to achieving accurate battery lifetime prediction, and the inherent patterns within temporal data from battery experiments are often elusive. Meanwhile, the commonality of missing data in real-world battery usage further complicates accurate lifetime prediction. To address these issues, this article develops a self-attention-based neural network (NN) to precisely forecast battery cycl

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Zhang, Wenkang, Wei Liu, Yangguang Liu, et al. "CMAS Corrosion Resistance of Plasma-Sprayed YSZ and Yb2O3-Y2O3-Co-Stabilized ZrO2 Coatings under 39–40 KW Spraying Power." Coatings 14, no. 8 (2024): 928. http://dx.doi.org/10.3390/coatings14080928.

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This study uses atmospheric plasma spraying (APS) technology to prepare thermal barrier coatings (TBCs) with yttrium-stabilized zirconia (YSZ) and Yb2O3-Y2O3-co-stabilized ZrO2 (YbYSZ) materials at different spraying powers. It analyzes the differences and changes in the microstructure, thermodynamic properties, and mechanical properties of the TBCs. The CaO-MgO-Al2O3-SiO2 (CMAS) resistance of coatings was tested using thermal cycling-CMAS experiments and isothermal corrosion experiments. Compared to YSZ coatings, YbYSZ coatings have lower thermal conductivity, a higher hardness and elastic mo

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Pautrel, Xavier. "ENVIRONMENTAL POLICY, EDUCATION AND GROWTH: A REAPPRAISAL WHEN LIFETIME IS FINITE." Macroeconomic Dynamics 16, no. 5 (2011): 661–85. http://dx.doi.org/10.1017/s1365100510000830.

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When finite lifetime is introduced in a Lucas [Journal of Monetary Economics 22 (1988), 3–42] growth model where the source of pollution is physical capital, the environmental policy may enhance the growth rate of a market economy, whereas pollution does not influence educational activities, labor supply is not elastic, and human capital does not enter the utility function. The result arises from the generational turnover effect due to finite lifetime and it remains valid under conditions when the education sector uses final output as well as time to accumulate human capital. This article also

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Linins, Oskars, Juris Krizbergs, and Irina Boiko. "Wear Estimation Using 3D Surface Roughness Parameters." Key Engineering Materials 527 (November 2012): 167–72. http://dx.doi.org/10.4028/www.scientific.net/kem.527.167.

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The aim of this work is to propose a methodology of lifetime prediction of details by new approach for linear wear intensity determination using 3D surface roughness parameters. For qualitative evaluation of the wear process the linear wear intensity (Ih), which may be determined separately for the plastic and elastic contact, is commonly used. Since the elastic contact is mainly required in pairs of details in mechanical engineering in these paper this kind of contact was examined. In our research, the random surface model was used. The surface machined with abrasive instruments (grinding, po

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Gope, Jhuma, Sushil Kumar, A. Parashar, S. Dayal, C. M. S. Rauthan, and P. C. Srivastava. "Effect of Hydrogen Content and Bonding Environment on Mechanical Properties of Hydrogenated Silicon Films Deposited by High-Frequency PECVD Process." ISRN Nanomaterials 2012 (July 17, 2012): 1–9. http://dx.doi.org/10.5402/2012/429348.

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The mechanical properties of hydrogenated silicon thin films deposited using high-frequency PECVD process were studied, which certainly have importance for optoelectronic devices particularly for getting stability and long operating lifetime in harsh conditions. Nanoindentation technique was used to measure the load versus displacement curves, hardness (H), elastic modulus (E), plastic resistance parameter (H/E), elastic recovery (ER), and plastic deformation energy (Ur), while laser scanning stress measurement setup was used to measure the intrinsic stress of these films. The concentration of

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Liu, Wenzhi, Yueqiu Deng, Pengcheng Qi, Xiaohao Yin, Xufeng Yang, and Liqi Gao. "Prediction of storage lifetime of rubber materials for flexible joint elastomers." Journal of Physics: Conference Series 2760, no. 1 (2024): 012081. http://dx.doi.org/10.1088/1742-6596/2760/1/012081.

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Abstract To investigate the aging performance and storage lifetime of rubber materials used in flexible joint elastomers for solid rocket engines, a compression permanent deformation was used as the performance evaluation index to conduct aging tests on the elastic specimens of joint rubber materials at different temperatures. The results showed that the compression permanent deformation increased with the aging time and temperature, and the value of compression permanent deformation was greater in the initial stage of aging than in the later stage. Based on the regularity of material aging pe

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Solovev, M., A. Leonhardt, A. Graf, A. Kunke, and V. Kräusel. "Development of geometry variants and forming technology for metal diaphragms to increase the efficiency of diaphragm compressor." IOP Conference Series: Materials Science and Engineering 1284, no. 1 (2023): 012009. http://dx.doi.org/10.1088/1757-899x/1284/1/012009.

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Abstract This article outlines the development of an elastically foldable, bistable diaphragm geometry that enables an increase in the compression volume of diaphragm compressors compared to the use of flat diaphragms. Using a Finite Element Model (FEM) in ABAQUS/Standard, several membrane geometries (truncated cone, cone, and dome) were calculated and analyzed with regard to their elastic deformation. Selected geometries were produced using Single Point Incremental Forming (SPIF) and tested by applying full-area pneumatic pressure to determine the diaphragm’s lifetime.

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Nguyen-Tri, Phuong, Ennouri Triki, and Tuan Anh Nguyen. "Butyl Rubber-Based Composite: Thermal Degradation and Prediction of Service Lifetime." Journal of Composites Science 3, no. 2 (2019): 48. http://dx.doi.org/10.3390/jcs3020048.

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Butyl rubber-based composite (BRC) is one of the most popular materials for the fabrication of protective gloves against chemical and mechanical risks. However, in many workplaces, such as metal manufacturing or automotive mechanical services, its mechanical hazards usually appear together with metalworking fluids (MWFs). The presence of these contaminants, particularly at high temperatures, could modify its properties due to the scission, the plasticization and the crosslinking of the polymer network and thus lead to severe modification of the mechanical and physicochemical properties of mate

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Zhong, Ke, Zhu Lu, Qing Guo, Ruiliang Mu, Mingzhi Sun, and Yuchun Li. "Thermal decomposition kinetics and aging lifetime prediction of waste rubbers in porous elastic road surface." Construction and Building Materials 435 (July 2024): 136677. http://dx.doi.org/10.1016/j.conbuildmat.2024.136677.

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Khurgin, Jacob B., Sanyam Bajaj, and Siddharth Rajan. "Elastic scattering by hot electrons and apparent lifetime of longitudinal optical phonons in gallium nitride." Applied Physics Letters 107, no. 26 (2015): 262101. http://dx.doi.org/10.1063/1.4938745.

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Someya, Satoshi, Keiko Ishii, Tetsuo Munakata, and Masayuki Saeki. "Lifetime-based measurement of stress during cyclic elastic deformation using mechanoluminescence of SrAl_2O_4:Eu^2+." Optics Express 22, no. 18 (2014): 21991. http://dx.doi.org/10.1364/oe.22.021991.

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Druyanov, B., and I. Roman. "Lower bound for LCF lifetime and its application to safe design of elastic viscoplastic structures." International Journal of Solids and Structures 43, no. 16 (2006): 4673–86. http://dx.doi.org/10.1016/j.ijsolstr.2005.06.013.

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