Strain state evolution and thickness-dependent properties of epitaxialNd0.7Sr0.3MnO3films

2007 ◽  
Vol 75 (21) ◽  
Author(s):  
S. W. Jin ◽  
G. Y. Gao ◽  
Z. Z. Yin ◽  
Z. Huang ◽  
X. Y. Zhou ◽  
...  
Keyword(s):  
Strain State ◽  
State Evolution

scholarly journals Evolution of the reinforced I-beam strain state

2018 ◽  
Vol 143 ◽  
pp. 01017 ◽  
Author(s):  
Artem Ustinov ◽  
Anatolij Klopotov ◽  
Aleksandr Potekaev ◽  
Vasilij Plevkov ◽  
Ekaterina Marchenko
Keyword(s):  
Composite Material ◽  
Strain State ◽  
Image Correlation ◽  
Correlation Technique ◽  
Digital Image Correlation Technique ◽  
Load Bearing Capacity ◽  
Four Point Bending ◽  
Reinforced Beams ◽  
State Evolution ◽  
Bending Loading

The paper presents experimental results of the strain state evolution of the steel I-beam reinforced with composite material under four-point bending loading. Digital image correlation technique was used to trace the evolution of plastic strain zones distribution. The images of longitudinal relative strain on the lateral surface of the reinforced I-beam web were obtained and analyzed. It was found that the increase of load-bearing capacity of the reinforced beams can exceed 26 %.

scholarly journals A NUMERICAL STUDY OF STRESS-STRAIN STATE EVOLUTION IN STRUCTURALLY INHOMOGENEOUS MATERIALS SUBJECTED TO UNIAXIAL LOADING

2016 ◽  
Vol 3 ◽  
pp. 175-187 ◽  
Author(s):  
Sergey Smirnov ◽  
Anatoly Konovalov ◽  
Marina Myasnikova ◽  
Yury Khalevitsky ◽  
Alexander Smirnov
Keyword(s):  
Strain State ◽  
Numerical Study ◽  
Uniaxial Loading ◽  
Inhomogeneous Materials ◽  
Stress Strain ◽  
Stress Strain State ◽  
State Evolution

Evolution of strain state of a rolled aluminum sheet in multi-pass conventional spinning

2020 ◽  
pp. 1-25
Author(s):  
Shiori Gondo ◽  
Hirohiko Arai ◽  
Satoshi Kajino ◽  
Shizuka Nakano
Keyword(s):  
Strain State ◽  
Radial Direction ◽  
Aluminum Sheet ◽  
Movement Direction ◽  
Forming Force ◽  
State Evolution ◽  
Rolled Aluminum ◽  
Conventional Spinning ◽  
Cylindrical Cup ◽  
The Relationship

Abstract This study clarified the strain state evolution of a cylindrical cup spun from a rolled aluminum sheet in 13 passes. Measurements of radial (εr), circumferential (εθ), and thickness (εt) directional strains as well as forming forces revealed that the strain state evolved as follows: the cup-wall exhibits εr < 0 and small |εθ| and |εt| in early passes and εr > 0, εθ < 0, and εt < 0 in later passes; meanwhile, the cup-edge exhibits εr > 0 and small |εθ| and |εt| in early passes and εr > 0, εθ< 0, and εt > 0 in later passes. The relationship between the strain states and forming force is interpreted as follows. The normal-direction forming force, which pushes into the workpiece in the thickness direction, primarily deforms the workpieces. The radial-direction forming force, toward to the edge along the workpiece configuration, facilitates elongation in the radial direction of the cup-wall and results in εr > 0 during spinning. By contrast, a small radial-direction forming force or a forming force whose direction is inverse against the roller movement direction restrains to elongate the material in the radial direction and facilitates shrinkage, thereby resulting in εr < 0 in the cup-edge in early passes. Furthermore, the small or inverse directional force facilitates the accumulation of the material to the edge and results in εt > 0 in latter passes.

Strain State Evolution and Thickness-Dependent Properties of Epitaxial La0.7Sr0.3MnO3 Thin Films

2012 ◽  
Vol 460 ◽  
pp. 214-217
Author(s):  
Ying Meng ◽  
Shi Bin Lu ◽  
Juan Gao
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Strain State ◽  
Epitaxial Film ◽  
Resistivity Measurement ◽  
Epitaxial Films ◽  
Reciprocal Space ◽  
X Ray ◽  
State Evolution

La0.7Sr0.3MnO3(LSMO) films 35-350nm thick have been grown on (001)LaAlO3 (LAO) substrates. The strain state evolution was examined fully by x-ray reciprocal space maps, in order to clarify its impact on the thickness-dependent properties of the films. It was found that LSMO epitaxial films have properties which is from partially strained to fully relaxed with film thickness increasing on the same substrate. Resistivity measurement shows that the relaxed film has higher resistivity than that of the strained film, because the relaxed film contains the high deficiency density. In this paper, however, the relaxed property of the same thickness LSMO epitaxial film grown on the different substrates is also discussed.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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