4,967 results match your criteria plastic deformation


Hydroplastic Micromolding of 2D Sheets.

Adv Mater 2021 May 14:e2008116. Epub 2021 May 14.

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China.

Processing 2D sheets into desired structures with high precision is of great importance for fabrication and application of their assemblies. Solution processing of 2D sheets from dilute dispersions is a commonly used method but offers limited control over feature size precision owing to the extreme volume shrinkage. Plastic processing from the solid state is therefore a preferable approach to achieve high precision. Read More

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Strain controlled fatigue response of large-scale perfect and defect nickel nanowires: A molecular dynamics study.

Authors:
Natraj Yedla

J Mol Graph Model 2021 Mar 3;106:107885. Epub 2021 Mar 3.

Computational Materials Engineering Group, Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, 769008, India. Electronic address:

In this study, the response of the nickel nanowire (NW) subjected to constant strain amplitudes in the range of 0.02-0.12 during cyclic deformation is investigated. Read More

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Mechanical plasticity of collagen directs branch elongation in human mammary gland organoids.

Nat Commun 2021 May 12;12(1):2759. Epub 2021 May 12.

Lehrstuhl für Biophysik E27, Physics Department and Center for Protein Assemblies CPA, Technical University Munich (TUM), Garching, Germany.

Epithelial branch elongation is a central developmental process during branching morphogenesis in diverse organs. This fundamental growth process into large arborized epithelial networks is accompanied by structural reorganization of the surrounding extracellular matrix (ECM), well beyond its mechanical linear response regime. Here, we report that epithelial ductal elongation within human mammary organoid branches relies on the non-linear and plastic mechanical response of the surrounding collagen. Read More

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Plasticity characterization of certain Nigeria clay minerals for their application in ceramic water filters.

Sci Prog 2021 Apr-Jun;104(2):368504211012148

Department of Material Science and Engineering, African University of Science and Technology, Federal Capital Territory, Abuja, Nigeria.

Plasticity is an essential property of clay that determines its suitability for water filtration. There are no published works on the plastic behavior of clays from the study locations. The plastic behavior of seven Nigerian clays was examined using plasticity indices and compressive stress parameters in relation to chemical compositions and moisture content. Read More

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Objective evaluation of caudal deviation of the nasal septum and selection of the appropriate septoplasty technique.

Auris Nasus Larynx 2021 May 6. Epub 2021 May 6.

Department of Otolaryngology-Head & Neck Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Hokkaido, Japan.

Objective: Several methods have been reported to correct caudal deviation of the nasal septum, including open septorhinoplasty (OSR) and septoplasty with Killian incision (KI). In general, OSR is applied instead of KI for caudal deviation. However, there is little objective evidence own on the effects of OSR and KI for caudal deviation. Read More

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Temperature Dependence of Lithium Anode Voiding in Argyrodite Solid-State Batteries.

ACS Appl Mater Interfaces 2021 May 7. Epub 2021 May 7.

Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.

Void formation at the Li/ceramic electrolyte interface of an all-solid-state battery on discharge results in high local current densities, dendrites on charge, and cell failure. Here, we show that such voiding is reduced at the Li/LiPSCl interface at elevated temperatures, sufficient to increase the critical current before voiding and cell failure from <0.25 mA cm at 25 °C to 0. Read More

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Glass ionomer cement modified by a imidazolium salt: adding antifungal properties to a biomaterial.

Braz J Microbiol 2021 May 5. Epub 2021 May 5.

Postgraduate Program in Biological Sciences: Pharmacology and Therapeutics, Universidade Federal Do Rio Grande Do Sul (UFRGS), Porto Alegre, RS, 90050-170, Brazil.

We present the structural modification of a commercially available glass ionomer cement by inserting the imidazolium salt 1-n-hexadecyl-3-methylimidazolium chloride (CMImCl), composing a new biomaterial with antifungal biofilm activity. Test specimens were prepared using a commercial glass ionomer cement to which 10 ppm of cetylpyridinium chloride (reference ionic antifungal agent) or CMImCl were added. The feasibility and hypoallergenicity of the new biomaterial were assessed by microhardness plastic deformation and chorioallantoic membrane assays. Read More

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Effect of Nitrogen Ion Implantation on the Cavitation Erosion Resistance and Cobalt-Based Solid Solution Phase Transformations of HIPed Stellite 6.

Materials (Basel) 2021 Apr 29;14(9). Epub 2021 Apr 29.

Institute of Physics, Maria Curie-Sklodowska University in Lublin, pl. M. Curie-Sklodowskiej 1, 20-031 Lublin, Poland.

From the wide range of engineering materials traditional Stellite 6 (cobalt alloy) exhibits excellent resistance to cavitation erosion (CE). Nonetheless, the influence of ion implantation of cobalt alloys on the CE behaviour has not been completely clarified by the literature. Thus, this work investigates the effect of nitrogen ion implantation (NII) of HIPed Stellite 6 on the improvement of resistance to CE. Read More

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Mechanical Properties and Durability of Rubberized and Glass Powder Modified Rubberized Concrete for Whitetopping Structures.

Materials (Basel) 2021 Apr 29;14(9). Epub 2021 Apr 29.

Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų Str. 48, LT-51367 Kaunas, Lithuania.

This paper analyzes concrete fine aggregate (sand) modification by scrap tire rubber particles-fine crumb rubber (FCR) and coarse crumb rubber (CCR) of fraction 0/1 mm. Such rubberized concrete to get better bonding properties were modified by car-boxylated styrene butadiene rubber (SBR) latex and to gain the strength were modified by glass waste. The following tests-slump test, fresh concrete density, fresh concrete air content, compressive strength, flexural strength, fracture energy, freezing-thawing, porosity parameter, and scanning electron microscope-were conducted for rubberized concretes. Read More

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Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder.

Nanomaterials (Basel) 2021 Apr 29;11(5). Epub 2021 Apr 29.

Nanotechnology and Applications Program, Energy and Building Research Center, Kuwait Institute for Scientific Research, Safat 13109, Kuwait.

Magnesium hydride (MgH) has received significant attention due to its potential applications as solid-state hydrogen storage media for useful fuel cell applications. Even though MgH possesses several attractive hydrogen storage properties, it cannot be utilized in fuel cell applications due to its high thermal stability and poor hydrogen uptake/release kinetics. High-energy ball milling, and mechanically-induced cold-rolling processes are the most common techniques to introduce severe plastic deformation and lattice imperfection in the Mg/MgH. Read More

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Enhanced Mechanical Properties and Microstructure of Accumulative Roll-Bonded Co/Pb Nanocomposite.

Nanomaterials (Basel) 2021 Apr 30;11(5). Epub 2021 Apr 30.

Mechanical Engineering Program, School of Science, Engineering and Technology, Pennsylvania State University, Harrisburg, Middletown, PA 17057, USA.

Lead composites have been used as anodes in the electrowinning process to produce metals such as copper and zinc. Manufacturing stable lead anodes with appropriate mechanical and chemical properties is required to improve the performance of the electrowinning process. In this study, an accumulative roll bonding (ARB) method was used to fabricate a Co/Pb nanocomposite. Read More

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Study on Interference Connection Based on Shape Recovery of NiTiNb Shape Memory Alloy.

Materials (Basel) 2021 Apr 30;14(9). Epub 2021 Apr 30.

Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.

Interference connection is an effective method for improving the fatigue life of bolt connections. In this paper, a new method of interference connection was designed based on the shape memory effect of shape memory alloy. Using the method of numerical simulation, a finite element model was established to analyze the stress-strain rule of the bolt and the hole wall under different interference fit sizes. Read More

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Irreducible Traumatic Radial Head Dislocation Due to Annular Ligament Interposition in a Child with Ulnar Plastic Deformation: A Case Report.

Orthop Surg 2021 May 4. Epub 2021 May 4.

VietDuc University Hospital, Hanoi, Vietnam.

Background: The traumatic dislocation of the radial head in children is commonly treated by closed reduction. Sometimes, however, this strategy of treatment may not be effective due to the location of soft tissues in the radio-shoulder joint. The literature presents a few cases of the irreducible radial head dislocation with ulnar plastic deformation. Read More

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Deformation of Needle Tips during Facial Soft Tissue Filler Injections: An Electron-Microscopic Study.

Aesthet Surg J 2021 May 4. Epub 2021 May 4.

Department of Clinical Anatomy, Mayo Clinic College of Medicine and Science, Rochester, MN.

Background: Injectable soft tissue fillers are used on a global scale for a variety of aesthetic indications. Despite their widespread use, there is a dearth of information regarding the potential repeated injections into tissue have to cause needle deformation. Repeated injections with the same needle result in an increase in force used by the injector to achieve dermal penetration, potentially resulting in decreased precision and increased patient discomfort. Read More

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Enhanced biomechanical performance of additively manufactured Ti-6Al-4V bone plates.

J Mech Behav Biomed Mater 2021 Apr 23;119:104552. Epub 2021 Apr 23.

Department of Materials Engineering, Indian Institute of Science, Bangalore, India. Electronic address:

As the global trauma fixation devices market expands rapidly, it is imperative to improve the production of fixation devices through enhanced design accuracy and fit for best performance and maximum patient comfort. Selective laser melting (SLM) is one of the mature additive manufacturing methods, which provides a viable route for the rapid production of such devices. In this work, the ability of SLM to produce near-net-shape parts, as desired for medical implants, was utilized for the fabrication of bone plates from Ti-6Al-4V alloy powder. Read More

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Plastic Deformation and Strengthening Mechanisms of Nanopolycrystalline Diamond.

ACS Nano 2021 Apr 30. Epub 2021 Apr 30.

Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.

Bulk nanopolycrystalline diamond (NPD) samples were deformed plastically within the diamond stability field up to 14 GPa and above 1473 K. Macroscopic differential stress Δσ was determined on the basis of the distortion of the 111 Debye ring using synchrotron X-ray diffraction. Up to ∼5(2)% strain, Debye ring distortion can be satisfactorily described by lattice strain theories as an ellipse. Read More

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Solution-Processed Stretchable Ag S Semiconductor Thin Films for Wearable Self-Powered Nonvolatile Memory.

Adv Mater 2021 Apr 30:e2100066. Epub 2021 Apr 30.

Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Compared with the large plastic deformation observed in ductile metals and organic materials, inorganic semiconductors have limited plasticity (<0.2%) due to their intrinsic bonding characters, restricting their widespread applications in stretchable electronics. Herein, the solution-processed synthesis of ductile α-Ag S thin films and fabrication of all-inorganic, self-powered, and stretchable memory devices, is reported. Read More

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Influence of high-pressure torsion deformation on the corrosion behaviour of a bioresorbable Mg-based alloy studied by positron annihilation.

Biomater Sci 2021 Apr 30. Epub 2021 Apr 30.

Institute of Materials Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.

The effect of high-pressure torsion (HPT) on the corrosion behavior of extruded ZX00 (Mg-0.45wt%Zn-0.45wt%Ca) in phosphate buffered saline solution is investigated. Read More

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Magnetic Resonance Imaging Evaluation of Acute Plastic Deformation of a Pediatric Radius.

J Hand Surg Asian Pac Vol 2021 Jun;26(2):280-283

Division of Hand Surgery, Department of Orthopedic Surgery, Nara Medical University, Nara, Japan.

Acute plastic deformation of long bones is more common in young children. We report a case of an acute plastic deformation of a pediatric radius via magnetic resonance imaging (MRI) evaluation. A 15-year-old boy fell on landing after a jump while practicing soccer, which injured his right forearm. Read More

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Omega Phase Formation in Ti-3wt.%Nb Alloy Induced by High-Pressure Torsion.

Materials (Basel) 2021 Apr 27;14(9). Epub 2021 Apr 27.

Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland.

It is well known that severe plastic deformation not only leads to strong grain refinement and material strengthening but also can drive phase transformations. A study of the fundamentals of α → ω phase transformations induced by high-pressure torsion (HPT) in Ti-Nb-based alloys is presented in the current work. Before HPT, a Ti-3wt. Read More

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Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers.

Materials (Basel) 2021 Apr 13;14(8). Epub 2021 Apr 13.

Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, Italy.

Fracture mechanics are of high interest for the engineering design and structural integrity assessment of polymeric materials; however, regarding highly ductile polymers, many open questions still remain in terms of fully understanding deformation and fracture behaviors. For example, the influence of the constraint and specimen size on the fracture behavior of polymeric materials is still not clear. In this study, a polymeric material with an elastic plastic deformation behavior (ABS, acrylonitrile butadiene styrene) is investigated with regard to the influence of constraint and specimen size. Read More

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Wear Resistance of Medium Carbon Steel with Different Microstructures.

Materials (Basel) 2021 Apr 16;14(8). Epub 2021 Apr 16.

Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun 130025, China.

In this research, the tribological properties of different microstructures of medium carbon steel produced by either an austempered process or quenched-tempered process are investigated. The as-received samples with annealed microstructure (spherodized) are austempered to obtain a bainite microstructure or quenched-tempered to obtain a tempered martensite microstructure. The tribological performance of these microstructures was studied using a ball-on-disk UMT3 tribometer. Read More

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Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM.

Materials (Basel) 2021 Apr 24;14(9). Epub 2021 Apr 24.

Department of Architecture and Civil Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan.

In recent years, many seismic retrofitting methods have been performed to improve the structural performance and prevent the brittle failure of structural members. In the case of steel structures, slender seismic braces have been widely used for buildings, towers, and bridges. The brace connections should resist the full plastic axial tension load to ensure adequate plastic deformation performance for vibration energy absorption. Read More

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A General Temperature-Dependent Stress-Strain Constitutive Model for Polymer-Bonded Composite Materials.

Polymers (Basel) 2021 Apr 25;13(9). Epub 2021 Apr 25.

Graduate School of China Academy of Engineering Physics, 10 Xibeiwang E. Rd., Beijing 100193, China.

This study develops a general temperature-dependent stress-strain constitutive model for polymer-bonded composite materials, allowing for the prediction of deformation behaviors under tension and compression in the testing temperature range. Laboratory testing of the material specimens in uniaxial tension and compression at multiple temperatures ranging from -40 ∘C to 75 ∘C is performed. The testing data reveal that the stress-strain response can be divided into two general regimes, namely, a short elastic part followed by the plastic part; therefore, the Ramberg-Osgood relationship is proposed to build the stress-strain constitutive model at a single temperature. Read More

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Coupled Thermomechanical Response Measurement of Deformation of Nickel-Based Superalloys Using Full-Field Digital Image Correlation and Infrared Thermography.

Materials (Basel) 2021 Apr 23;14(9). Epub 2021 Apr 23.

Department of Metal Working and Physical Metallurgy of Non-Ferrous Metals, Faculty of Non-Ferrous Metals, AGH-University of Science and Technology, al. Adama Mickiewicza 30, 30-059 Cracow, Poland.

The paper is devoted to highlighting the potential application of the quantitative imaging technique through results associated with work hardening, strain rate and heat generated during elastic and plastic deformation. The aim of the research presented in this article is to determine the relationship between deformation in the uniaxial tensile test of samples made of 1-mm-thick nickel-based superalloys and their change in temperature during deformation. The relationship between yield stress and the Taylor-Quinney coefficient and their change with the strain rate were determined. Read More

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Adjusting the Residual Stress State in Wire Drawing Products via In-Process Modification of Tool Geometries.

Materials (Basel) 2021 Apr 23;14(9). Epub 2021 Apr 23.

Fraunhofer Institute for Machine Tools and Forming Technology IWU, D-09126 Chemnitz, Germany.

After conventional forming processes, the residual stress distribution in wires is frequently unfavorable for subsequent processes, such as bending operations. High tensile residual stresses typically occur near the wire surface and normally limit further processability of the material. Additional heat treatment operations or shot peening are often used to influence the residual stress distribution in the material after conventional manufacturing, which is time- and energy-consuming. Read More

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Predictive Computational Model for Damage Behavior of Metal-Matrix Composites Emphasizing the Effect of Particle Size and Volume Fraction.

Materials (Basel) 2021 Apr 23;14(9). Epub 2021 Apr 23.

Department of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig University, Zagazig P.O. Box 44519, Egypt.

In this paper, an integrated numerical model is proposed to investigate the effects of particulate size and volume fraction on the deformation, damage, and failure behaviors of particulate-reinforced metal matrix composites (PRMMCs). In the framework of a random microstructure-based finite element modelling, the plastic deformation and ductile cracking of the matrix are, respectively, modelled using Johnson-Cook constitutive relation and Johnson-Cook ductile fracture model. The matrix-particle interface decohesion is simulated by employing the surface-based-cohesive zone method, while the particulate fracture is manipulated by the elastic-brittle cracking model, in which the damage evolution criterion depends on the fracture energy cracking criterion. Read More

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