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SPE Polymers 2021年第1期2卷 50-61页

作者： Chang, Yuan-Hsiang Zhang, Yulin Chiang, Donyau Yang, Fuqian Lee, Sanboh Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Materials Program Department of Chemical and Materials Program University of Kentucky Lexington KY United States Taiwan Instrument Research Institute National Applied Research Laboratories Hsinchu Taiwan

Understanding the effect of gamma-ray irradiation on the nonisothermal crystallization of polymer during cooling is of practical importance for the applications and manufacturing of crystallized polymer. In this work, we expose poly(4-methyl-1-pentene) (PMP) to gamma-ray with different irradiation doses and study the crystallization of the gamma-ray irradiated PMPs. All the PMPs exhibit a doublet peak in the differential scanning calorimeter thermograms for the cooling rates in a range of 2.5–20°C/min. We use linear superposition of two inverse Gaussian functions to decompose the doublet peak into two individual peaks and analyze the crystallization kinetics of the crystallization processes associated with individual peaks. The Avrami exponent decreases with the decrease of the crystallization temperature and is in a range of 0.96–2.43 for the crystallization near the melting point and a range of 0.72–1.68 for the crystallization away the melting temperature. The activation energy for the crystallization near the melting temperature decreases with the increase of the irradiation dose. For the crystallization away from the melting temperature, the activation energy for the PMPs without gamma-ray irradiation is smallest. © 2021 The Authors. SPE Polymers published by Wiley Periodicals LLC. on behalf of Society of Plastics Engineers.

关键词： activation energy crystallization doublet peak gamma-ray irradiation poly(4-methyl-1-pentene)

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Strengthening by engineering Chemical Segregation at Dislocations in a Concentrated Solid Solution Alloy

SSRN

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SSRN 2024年

作者： Cheng, Qing Tan, Fusheng Ming, Wenquan Ding, Jun Gao, Qingyang Chen, Mingwei Chen, Jianghua Xu, Xiandong Ma, En College of Materials Science and Engineering Hunan University Changsha410082 China Applied Mechanics Lab School of Aerospace Engineering Tsinghua University Beijing100084 China Pico Electron Microscopy Center College of Materials Science and Engineering Hainan University Haikou570228 China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'An710049 China Department of Materials Science and Engineering Hopkins Extreme Materials Institute Johns Hopkins University BaltimoreMD21218 United States

Upon ageing of a defect-ridden metal, compositional segregation to dislocations and stacking faults is well known to elevate strength. However, such Suzuki segregation effects deliver a strength increment merely on the order of 10 MPa for many substitutional face-centered-cubic solid solutions. Severe pre-deformation can lead to significant hardening but sacrifices large tensile ductility after subsequent aging. Here we propose a novel strategy to improve the Suzuki hardening effect in a single-phase CoCrNi alloy by carefully controlling repetitive straining and annealing conditions without sacrificing ductility. It was revealed that multiple stages of annealing along the way of pre-straining increase the fraction of bogged-down dislocations collecting partitioning species (i.e. Cr), to a level well beyond that achievable via one-shot annealing after straight pre-deformation to the same accumulative strain (40%). Thermodynamically, the segregation of Cr into stacking faults is driven by reduced stacking fault energy (SEF) and system energy. The decreased SFE inhibits dislocation cross-slip, promotes partial dislocation nucleation, and facilitates dislocation intersection, leading to a high density of widened stacking fault ribbons in the multi-pass strained and annealed samples. As a result, the yield strength increments of multi-pass treated samples (75 ± 10 MPa) are four times higher than that of single-pass treated samples (18 ± 8 MPa), while retaining an adequate strain hardening rate, such that there is no sacrifice of tensile ductility despite of plastic flow at higher stresses. Our strategy holds promise for broader application, especially in those cases where routine thermomechanical treatment fails to produce satisfactory results. © 2024, The Authors. All rights reserved.

关键词： Solid solutions

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Free vibration analysis of multi-span orthotropic bridge deck with rubber bearings

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Diagnostyka 2021年第1期22卷 11-21页

作者： Farah, Imed Rezaiguia, Abdelouahab Mouassa, Ahcene Debra, Laefer Guenfoud, Salah Applied Mechanics of New Materials Laboratory University of 8 May Guelma1945 Algeria Mechanic and Structures Laboratory University of 8 May Guelma1945 Algeria Center for Urban Science and Progress Department of Civil Engineering Tandon School of Engineering Center for Urban Science and Progress New York University United States

In this paper, a semi-analytical approach is proposed for free vibration analysis of a multi-span, orthotropic bridge deck with rubber bearings. This allows more realistic modeling of vibration transmission from a bridge's deck to its supports. The approach is based on modal superposition incorporating intermodal coupling. The bridge deck was modeled as a continuous, multi-span, orthotropic rectangular plate with equivalent rigidities. The rubber bearings were inserted between the girders and rigid supports to absorb traffic induced vibrations. The rubber bearing was modeled by linear elastic, vertical supports as very flexible in rotation and highly rigid in the vertical direction. The method's efficacy was validated against two numerical examples. The absolute error was less than 10%. © 2021 Polish Society of Technical Diagnostics. All rights reserved.

关键词： Vibration analysis

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SR-CLD: spatially-resolved chord length distributions for statistical description, visualization, and alignment of non-uniform microstructures

arXiv

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arXiv 2024年

作者： Whitman, Sheila E. Latypov, Marat I. Graduate Interdisciplinary Program in Applied Mathematics University of Arizona TucsonAZ85721 United States Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States

This study introduces the calculation of spatially-resolved chord length distribution (SR-CLD) as an efficient approach for quantifying and visualizing non-uniform microstructures in heterogeneous materials. SR-CLD enables detailed analysis of spatial variation of microstructure constituent sizes in different directions that can be overlooked with traditional descriptions. We present the calculation of SR-CLD using efficient scan-line algorithm that counts pixels in constituents along pixel rows or columns of microstructure images for detailed, high-resolution SR-CLD maps. We demonstrate the application of SR-CLD in two case studies: one on synthetic polycrystalline microstructures with known and intentionally created uniform and gradient spatial distributions of grain size;and one on experimental images of two-phase microstructures of additively manufactured Ti alloys with significant spatially non-uniform distributions of laths of one of the phases. Additionally, we present how SR-CLDs can enable automated, computationally efficient, and robust alignment of large sets of images for merging into accurate composite images of large microstructure areas. © 2024, CC BY.

关键词： Titanium alloys

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Hard nanocrystalline gold materials prepared via high-pressure phase transformation

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Nano Research 2022年第7期15卷 6678-6685页

作者： Chenlong Xie Wenxin Niu Penghui Li Yiyao Ge Jiawei Liu Zhanxi Fan Xiaoxiao Liu Ye Chen Ming Zhou Zihe Li Mengdong Ma Yonghai Yue Jing Wang Li Zhu Kun Luo Yang Zhang Yingju Wu Lin Wang Bo Xu Hua Zhang Zhisheng Zhao Yongjun Tian Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Center for Programmable Materials School of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of Chemistry City University of Hong KongHong KongChina Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongHong KongChina Shenzhen Research Institute City University of Hong KongShenzhen 518057China Department of Chemistry The Chinese University of Hong KongHong KongChina School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100190China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China

As one of the important materials,nanocrystalline Au(n-Au)has gained numerous interests in recent decades owing to its unique properties and promising ***,most of the current n-Au thin films are supported on substrates,limiting the study on their mechanical properties and ***,it is urgently desired to develop a new strategy to prepare nAu materials with superior mechanical strength and ***,a hard n-Au material with an average grain size of~40 nm is prepared by cold-forging of the unique Au nanoribbons(NRBs)with unconventional 4H phase under high *** characterizations reveal the phase transformation from 4H to face-centered cubic(fcc)phase during the cold ***,the compressive yield strength and Vickers hardness(HV)of the prepared n-Au material reach~140.2 MPa and~1.0 GPa,which are 4.2 and 2.2 times of the microcrystalline Au foil,*** work demonstrates that the combination of high-pressure cold-forging and the in-situ 4H-to-fcc phase transformation can effectively inhibit the grain growth in the obtained n-Au materials,leading to the formation of novel hard n-Au *** strategy opens up a new avenue for the preparation of nanocrystalline metals with superior mechanical property.

关键词： nanocrystalline Au high hardness high strength high-pressure forging 4H Au nanoribbons

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AnisoGNN: graph neural networks generalizing to anisotropic properties of polycrystals

arXiv

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arXiv 2024年

作者： Hu, Guangyu Latypov, Marat I. Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States Graduate Interdisciplinary Program in Applied Mathematics University of Arizona TucsonAZ85721 United States

We present AnisoGNNs - graph neural networks (GNNs) that generalize predictions of anisotropic properties of polycrystals in arbitrary testing directions without the need in excessive training data. To this end, we develop GNNs with a physics-inspired combination of node attributes and aggregation function. We demonstrate the excellent generalization capabilities of AnisoGNNs in predicting anisotropic elastic and inelastic properties of two alloys. © 2024, CC BY.

关键词： Anisotropy

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Experimental Characterization of the Thermal Properties of Thin Polypropylene Plates Reinforced with Residues and Fibers from the Borassus Wood (Rônier) of Chad

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Open Journal of applied sciences 2025年第2期15卷 517-529页

作者： Abakar Malgnan Kimtangar Ngargueudedjim Bruno Bassa Hinpere Wedjou Bianpambe Guy Edgar Ntamack Laboratory of Studies and Research in Industrial Technology Faculty of Exact and Applied Sciences University of NDjamena NDjamena Chad Department of Mechanical Engineering National Higher Institute of Sciences and Technology of Abch Abch Chad Group of Mechanics Materials and Acoustics (GMMA) Department of Physics Faculty of Science University of NGaoundr Ngaoundr Cameroon

This study focuses on the thermophysical characterizations of composite materials made from polypropylene reinforced with residues and fibers from Borassus wood from Chad. These properties are experimentally determined at different temperatures using the hot wire method of the “FP2C” machine, where the hot wire probe is inserted between two specimens. The values of the thermal conductivity in powdered Borassus wood range from 0.170 W/mK to 0.182 W/mK for female wood (FNTF) and from 0.169 W/mK to 0.173 W/mK for male wood. For the female and male fibers, the thermal conductivity values range from 0.137 W/mK to 0.157 W/mK for the female and from 0.138 W/mK to 0.168 W/mK for the male. The thermal effusivity of the residues and fibers of Borassus wood varies from: 509.6 Ws1/2/m2K to 543 Ws1/2/m2K for the powder of female wood and from 524.6 Ws1/2/m2K to 547 Ws1/2/m2K for the powder of male wood. For the fibers of Borassus wood, the values range from 410.6 Ws1/2/m2K to 523.6 Ws1/2/m2K for the female wood fibers and from 420.3 Ws1/2/m2K to 480.3 Ws1/2/m2K for the male wood fibers. These results are important for the applications of Borassus wood residues and fibers in construction works regarding the thermal insulation of habitats.

关键词： Composite materials Residues and Fibers of Rônier Wood from Chad Thin Sheets Thermal Properties Characterization

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Ultra-Sensitive Detection of Cea and Cyfra 21-1 Using Ethanolamine-Functionalized Boron Doped Diamond Biosensor

SSRN

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SSRN 2025年

作者： Joshi, Sowmya Nara, Arunachalam Ramachandra Rao, M.S. Sudhakar, Swati Madras Chennai600036 India Department of Physics Nano Functional Materials Technology Centre and Materials Science Research Centre Indian Institute of Technology Madras Chennai600036 India Department of Applied Mechanics and Biomedical Engineering Indian Institute of Technology Madras Chennai600036 India

Lung cancer is one of the biggest challenges in global health;therefore, there is a huge need for better methods of early detection since this will improve survival rates and outcomes for patients significantly. One way to do it is by monitoring the lung cancer biomarkers (CEA and CYFRA 21-1) before the onset of any clinical symptoms. This paper introduces a new detection method using an Ethanolamine (ETA) modified Boron Doped Diamond (BDD) current sensor. The sensor was characterized at every step of the process for the successful integration of the biosensor with different layers. Scanning electron microscopy (SEM) revealed changes in the surface morphology after each stage of device preparation and testing. Further proof of the amine functional groups on the BDD surface was carried out through X-ray photoelectron photo-electron spectroscopy (XPS) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. After CEA and CYFRA 21-1 immobilization on the diamond sensor, we obtained a yieldable LOD of 83 and 43 fg/mL for CEA and CYFRA 21-1 respectively. The biosensor exhibited remarkable responses of 8.79% to 69.3% and 10.2% to 66.7% for CYFRA 21-1 and CEA, respectively, of concentration ranging from 0.001 to 400ng/mL. Additionally, it presented stable and accurate detection of CEA antigen in human serum samples. The developed ETA-modified BDD sensor has excellent prospects for the early detection of lung cancer biomarkers. © 2025, The Authors. All rights reserved.

关键词： X ray photoelectron spectroscopy

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Emulsions that Store Oxygen for Fast ORR Kinetics and Multifunctional Robotic and Mobility Systems

SSRN

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SSRN 2024年

作者： Johnson, Alissa C. Fontaine, Alice S. Beeman, Emily A. Pikul, James Henry Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania PhiladelphiaPA19104 United States Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Mechanical Engineering University of Wisconsin-Madison MadisonWI53705 United States

Many processes such as catalysis, energy transport, and carbon capture rely on the transport or storage of gases in liquid phases, but the low solubility of gases in liquids limit the rate and efficiency of these processes. Human circulatory systems store large concentrations of oxygen and provide it continuously and simultaneously to trillions of cells without the need for each cell to access the surrounding environment. Inspired by biological circulatory systems, we envision future robotic systems with multifunctional, fully integrated, air-rechargeable energy delivery and storage. This paper presents a high-pH aqueous air catholyte emulsion (ACE) with high oxygen solubility so that metal-air batteries can derive energy entirely from dissolved oxygen. With only 20% silicone oil by volume, ACEs can store twice as much dissolved oxygen (15 mg/L) as pure KOH samples, remain stable for several months, and show superior oxygen reduction reaction kinetics compared to KOH. Zinc-air flow cells with fully submerged electrodes can achieve 4.6 mW/cm2 at 5.6 mA/cm2. A multifunctional actuator flow cell configuration employs an ACE as both a hydraulic actuator and energy storage fluid, demonstrating the feasibility of ACEs as multifunctional, flexible power sources for soft robotic systems. © 2024, The Authors. All rights reserved.

关键词： Emulsification

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FIP-GNN: Graph neural networks for scalable prediction of grain-level fatigue indicator parameters

arXiv

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arXiv 2024年

作者： Sim, Gyu-Jang Lee, Myoung-Gyu Latypov, Marat I. Department of Materials Science and Engineering & RIAM Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States Graduate Interdisciplinary Program in Applied Mathematics University of Arizona TucsonAZ85721 United States

High-cycle fatigue is a critical performance metric of structural alloys for many applications. The high cost, time, and labor involved in experimental fatigue testing call for efficient and accurate computer models of fatigue life. We present FIP-GNN – a graph neural network for polycrystals that (i) predicts fatigue indicator parameters as grain-level inelastic responses to cyclic loading quantifying the local driving force for crack initiation and (ii) generalizes these predictions to large microstructure volume elements with grain populations well beyond those used in training. These advances can make significant contributions to statistically rigorous and computationally efficient modeling of high-cycle fatigue – a long-standing challenge in the field. © 2024, CC BY.

关键词： High-cycle fatigue

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