Stresses Analysis on Coarse Grain Zn Film during Tensile Loading

2006 ◽  
Vol 524-525 ◽  
pp. 723-728
Author(s):  
Wen Jun Huang ◽  
Vincent Ji ◽  
Wilfrid Seiler
Keyword(s):  
Steel Substrate ◽  
Strain Tensor ◽  
Tensile Loading ◽  
New Method ◽  
Coarse Grain ◽  
Initial State ◽  
Metric Tensor ◽  
Coarse Grains ◽  
Deformed State ◽  
Galvanized Coating

The advance of the XRD technique allows us to reach the properties of each coarse grain. This paper has demonstrated a new method to determine stress in a single crystal for multicrystal material and this new method could be specially applied for any symmetric crystalline systems. The strain tensor ε is determined by the change of the metric tensor G before the initial state and after the deformed state in the crystal reference system. Then stress tensor at grain scale is calculated by the Hooks law. The stress evaluations are carried out in coarse grains of a thin galvanized coating on a steel substrate during tensile loading. This study allows us to link the microstructure evolution to the elastic heterogeneity at grain scale or between the grains.

scholarly journals Stress-free state of the red blood cell membrane and the deformation of its skeleton

2012 ◽  
Vol 17 (2) ◽  
Author(s):  
Tjaša Švelc ◽  
Saša Svetina
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Variational Calculation ◽  
Lateral Distribution ◽  
Free State ◽  
Initial State ◽  
Proposed Model ◽  
Deformed State ◽  
Concentric Circles ◽  
Stress Free State

AbstractThe response of a red blood cell (RBC) to deformation depends on its membrane, a composite of a lipid bilayer and a skeleton, which is a closed, twodimensional network of spectrin tetramers as its bonds. The deformation of the skeleton and its lateral redistribution are studied in terms of the RBC resting state for a fixed geometry of the RBC, partially aspirated into a micropipette. The geometry of the RBC skeleton in its initial state is taken to be either two concentric circles, a references biconcave shape or a sphere. It is assumed that in its initial state the skeleton is distributed laterally in a homogeneous manner with its bonds either unstressed, presenting its stress-free state, or prestressed. The lateral distribution was calculated using a variational calculation. It was assumed that the spectrin tetramer bonds exhibit a linear elasticity. The results showed a significant effect of the initial skeleton geometry on its lateral distribution in the deformed state. The proposed model is used to analyze the measurements of skeleton extension ratios by the method of applying two modes of RBC micropipette aspiration.

Features of determining the deformed state of a particle material during hot stamping of porous moldings

2021 ◽  
pp. 21-30
Author(s):  
B. G. Gasanov ◽  
A. A. Aganov ◽  
P. V. Sirotin
Keyword(s):  
Displacement Vector ◽  
Hot Stamping ◽  
Strain Tensor ◽  
Particle Material ◽  
Software Algorithms ◽  
Deformed State ◽  
Metal Strain ◽  
Scalar Products ◽  
Analytical Expressions ◽  
Kinetics Of

The paper describes main methods for assessing the deformed state of porous body metal frames developed by different authors based on the analysis of yield conditions and governing equations, using the principle of equivalent strains and stresses, and studying the kinetics of metal strain during pressing. Formulas were derived to determine the components of the powder particle material strain tensor through dyads, as scalar products of the basis vectors of the convected coordinate system at each moment of porous molding strain. The expediency of using the analytical expressions developed to determine the deformed state of the particle material was experimentally substantiated subject to the known displacement vector parameters of representative elements (macrostrains) of porous billets. The applications of well-known analytical expressions were established, and the proposed formulas proved applicable for the deformed state assessment of particle metal during the pressure processing of powder products of different configurations and designing billets with a defined porosity and geometric parameters as a basis for compiling software algorithms for the computer simulation of porous molding hot stamping.

scholarly journals Application of Bonded Joints for Quantitative Analysis of Adhesion

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Jarmila Trpčevská ◽  
Mária Kollárová ◽  
Eva Zdravecká ◽  
Jana Tkáčová
Keyword(s):  
Steel Substrate ◽  
Zinc Coating ◽  
Experimental Tests ◽  
Coated Steel ◽  
Bonded Joints ◽  
Steel Sheets ◽  
Galvanized Coating ◽  
Zinc Coatings ◽  
Peel Tests

The performance of hot-dip coated steel sheets is associated with properties of the zinc coatings on steel substrate. For the characterization of the adhesion behaviour of zinc coating on steel various tests were employed. The study was focused on quantification assessment of galvanized coating adhesion to substrates. Methods for evaluation of the bonding strength of zinc coating by the shear strength and the T-peel tests applying four special types of adhesives were used. The experimental tests of bonded joints show that the adhesion of the zinc coating to the substrate was higher than that of the applied adhesive with the highest strength.

Photocrosslinking of EPDM Elastomers. A New Method for Rapid Curing of Elastomer Coatings at Room Temperature

1988 ◽  
Vol 61 (4) ◽  
pp. 568-576 ◽  
Author(s):  
J. Hilborn ◽  
B. Rånby
Keyword(s):  
Room Temperature ◽  
Uv Light ◽  
Steel Substrate ◽  
New Method ◽  
Practical Applications ◽  
Optimum Formulation ◽  
Thick Layers

Abstract Photocrosslinking with UV light in air of silica-filled EPDM rubbers is possible in practical applications for at least 2 mm thick layers which are cemented onto a steel substrate. To find the optimum formulation of the rubber composition, it is essential to know the function of each component. Further optimization can be achieved by using the APOE to the TMPTA system and by using a suitable primer cement on the metal.

Effect of Fill Size on the Stability of Barrier Dams

2011 ◽  
Vol 90-93 ◽  
pp. 1373-1382 ◽  
Author(s):  
Zhen Ming Shi ◽  
You Quan Wang ◽  
Jian Feng Chen ◽  
Zu Guang Shang ◽  
Xiao Tao He
Keyword(s):  
Debris Flow ◽  
Failure Mode ◽  
High Speed ◽  
Failure Time ◽  
Coarse Grain ◽  
Fine Grained ◽  
Fine Grain ◽  
Earth Pressures ◽  
Coarse Grains ◽  
The Stability

The fills of barrier dams commonly result from high-speed landslides debris flow. In this paper, four model tests were conducted to study the effect of fill size on the stability of barrier dams. The failure time, failure mode, pore pressures and earth pressures were then observed and analyzed. The results show that barrier dams composed of coarse-grains or well-graded fills are more stable than those composed of fine-grained fills; coarse-grain-dams are more sensitive to the rising of water level than fine-grain-dams; the failure mode of coarse-grain-dams is usually overflowing-erosion and the barrier dams usually fail from the top of dams; the failure mode of fine-grain-dams is sliding and the barrier dams fail initially from the slope downstream.

scholarly journals Improvement of structural efficiency in metals by the control of topological arrangements in ultrafine and coarse grains

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abdallah Shokry ◽  
Aylin Ahadi ◽  
Per Ståhle ◽  
Dmytro Orlov
Keyword(s):  
Plastic Instability ◽  
Ultrafine Grain ◽  
Coarse Grain ◽  
Random Structure ◽  
Heterogeneous Structure ◽  
Efficient Design ◽  
Structural Efficiency ◽  
Coarse Grains ◽  
Dimensional Finite Element ◽  
Scale Levels

AbstractImprovement of structural efficiency in various materials is critically important for sustainable society development and the efficient use of natural resources. Recently, a lot of attention in science and engineering has been attracted to heterogeneous-structure materials because of high structural efficiency. However, strategies for the efficient design of heterogenous structures are still in their infancy therefore demanding extensive exploration. In this work, two-dimensional finite-element models for pure nickel with bimodal distributions of grain sizes having ‘harmonic’ and ‘random’ spatial topological arrangements of coarse and ultrafine-grain areas are developed. The bimodal random-structure material shows heterogeneities in stress–strain distributions at all scale levels developing immediately upon loading, which leads to developing concentrations of strain and premature global plastic instability. The bimodal harmonic-structure material demonstrates strength and ductility significantly exceeding those in the bimodal random-structure as well as expectations from a rule of mixtures. The strain hardening rates also significantly exceed those in homogeneous materials while being primarily controlled by coarse-grain phase at the early, by ultrafine-grain at the later and by their compatible straining at the intermediate stages of loading. The study emphasises the importance of topological ultrafine-/coarse-grain distributions, and the continuity of the ultrafine-grain skeleton in particular.

The Occurrence of a Peripheral Coarse Grain Zone (PCGZ) in Extruded Bars of AA 7108

2021 ◽  
Vol 1016 ◽  
pp. 1141-1146
Author(s):  
Saul Hissaci de Souza ◽  
Ronald Lesley Plaut ◽  
Nelson Batista de Lima ◽  
Rene Ramos de Oliveira ◽  
Angelo Fernando Padilha
Keyword(s):  
Electron Backscatter Diffraction ◽  
Microstructural Analysis ◽  
Polarized Light ◽  
Coarse Grain ◽  
X Ray Diffraction ◽  
Rectangular Section ◽  
X Ray ◽  
Analysis Techniques ◽  
Coarse Grains ◽  
Backscatter Diffraction

Industrial-scale extruded profiles of AA 7108 with a rectangular section (25.60 mm x 15.95 mm) were used in this investigation. Some complementary microstructural analysis techniques, such as polarized light microscopy, EBSD (Electron Backscatter Diffraction) and X-ray diffraction were used to characterize the microstructure, focusing on the PCG zone. It was observed that the extruded profiles presented a totally recrystallized microstructure and a 300 μm layer of peripheral coarse grains. Additionally, the results showed that the PCGZ predominant grain orientation {311} <110> differs from the texture below the PCGZ (Goss and Cube components).

X-Ray Stress Measurement of Ni-Ai System Intermetallic Compounds

1995 ◽  
Vol 39 ◽  
pp. 243-249
Author(s):  
Tokimasa Goto ◽  
Hiroyuki Tabata ◽  
Yukio Hirose
Keyword(s):  
Intermetallic Compounds ◽  
Stress Measurement ◽  
Preferred Orientation ◽  
Coarse Grain ◽  
X Rays ◽  
Melting Method ◽  
X Ray ◽  
Arc Melting ◽  
Coarse Grains ◽  
Heat Resisting Materials

The microstructures and mechanical properties of Ni-Al system intermetallic compounds used as heat resisting materials have been investigated by many researchers[l,2], but there are few studies applying X-ray stress measurement to these materials[3]. Two problems make it difficult: One is the comparatively coarse grain size, the other is the strong preferred orientation along the direction of the solidification. Therefore, it become possible to evaluate mechanical behavior in these materials, if we can measure the residual stresses correctlv by X-rays.In this paper, Ni-25mol%AI(Ni3Al) made by the arc-melting method was employed. It consists of comparatively coarse grains and has strong preferred orientation along the direction of the solidification.

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