A numerical study on the effect of osmotic pressure on stress and strain in intercellular structures of tumor tissue in the poro-elastic model

Meccanica ◽  
2021 ◽  
Author(s):  
Mahdi Halabian ◽  
Borhan Beigzadeh ◽  
Majid Siavashi
Keyword(s):  
Osmotic Pressure ◽  
Tumor Tissue ◽  
Numerical Study ◽  
Stress And Strain ◽  
Elastic Model

Experimental and numerical investigation of Armox 500T armor steel perforation process

2021 ◽  
Vol 70 (1) ◽  
pp. 43-61
Author(s):  
Arkadiusz Popławski
Keyword(s):  
Plastic Deformation ◽  
Strain State ◽  
Numerical Study ◽  
Stress And Strain ◽  
Failure Model ◽  
Modes Of Failure ◽  
State Of Stress ◽  
Computational Code ◽  
Armor Steel ◽  
Plate Perforation

This paper presents the results of an experimental and numerical study of the perforation of Armox 500T armoured steel. The plate perforation was performed with a pneumatic gun using three types of penetrators. Sharp, spherical and blunt penetrators were used. The use of different geometries of penetrators causes the process of perforation and destruction of plates in a different state of stress and strain, which leads to the appearance of three basic modes of failure. Numerical analyses of the perforation process have been carried out using the Ls-Dyna computational code with an advanced constitutive model of the material and the integrated failure model. The obtained experimental and numerical results were analysed and compared. The failure shape, the level of plastic deformation and the parameters of stress and strain state were analysed.

Numerical Study of a 3-Axis Stage for Application of Fast Tool Servo

2014 ◽  
Vol 625 ◽  
pp. 219-223 ◽  
Author(s):  
Yung Tien Liu ◽  
Bo Jheng Li
Keyword(s):  
Numerical Study ◽  
Fast Response ◽  
Maximum Deviation ◽  
Stress And Strain ◽  
Fast Tool Servo ◽  
The Finite Element Method ◽  
Resonant Frequencies ◽  
Calculation Results ◽  
Flexural Hinges ◽  
Maximum Stresses

In this paper, a 3-axis stage consisted of a XY stage and Z-axis feeding tool holder is proposed for the application of fast tool servo (FTS). The XY stage actuated by six piezoelectric (PZT) actuators is designed with symmetric flexural hinges featuring low interference motions, high stiffness, and fast response. Numerical design using the finite element method (FEM) was conducted to investigate the steady characteristics (displacement, stiffness, stress, and strain) and dynamic characteristic of resonance frequency. According to calculation results, the major characteristics obtained along XYZ axes are as follows: displacements induced are 10.06, 10.28, and 20.31 μm due to the applied voltage being 50 V; stiffness are 112.84, 110.31, and 223.34 kN/mm; the maximum stresses at the hinges are 9.78, 10.9, and 100.56 N/mm2, which are lower than the allowable stress of aluminum used; and the resonant frequencies are 1.0, 0.64, and 0.4 kHz, respectively. Experimental examinations regarding to the resonant frequencies were performed with a maximum deviation of 16% along the Z-axis compared to the simulation result. As a result of the investigation, it is expected that the 3-axis stage can be effectively applied to implement a FTS.

A Nonlinear Elastic Model for Isotropic Materials With Different Behavior in Tension and Compression

1982 ◽  
Vol 104 (1) ◽  
pp. 26-28 ◽  
Author(s):  
Gianluca Medri
Keyword(s):  
Mechanical Characterization ◽  
Three Dimensional ◽  
Small Deformation ◽  
Stress And Strain ◽  
Elastic Model ◽  
Strain Fields ◽  
Isotropic Materials ◽  
Tension And Compression ◽  
Nonlinear Elastic

This note presents a model suitable for the mechanical characterization of isotropic materials with different behavior in tension and compression. The model has been derived from the nonlinear elastic theory and elaborated to adapt it to the small deformation field; the constitutive relation may reliably correlate stress and strain fields even in three-dimensional elastic problems.

Numerical Study on Creep Properties of the Governing Stage Blade for Large Power Steam Turbine Considering Airflow Force

2014 ◽  
Vol 490-491 ◽  
pp. 437-441
Author(s):  
Rui Shan Yuan ◽  
Tian Yuan Liu
Keyword(s):  
Steam Turbine ◽  
Centrifugal Force ◽  
Numerical Study ◽  
Creep Process ◽  
Stress And Strain ◽  
Large Power ◽  
Creep Properties ◽  
Temperature Load ◽  
Critical Components ◽  
Stress And Deformation

As one of the critical components of the steam turbine, the security of turboset is directly affected by the reliability of the blade. In this paper, taking the governing stage blade of a large-power steam turbine for example, the thermal elasticity stress and deformation of the blade were analyzed under the action of airflow force,centrifugal force and temperature load. Then the Norton model was adopted to simulate the blade creep process of 100000 hours and the stress and strain of the blade were obtained.

scholarly journals Stress and Strain Analysis of Plywood Seat Shell

2019 ◽  
Vol 70 (1) ◽  
pp. 51-59
Author(s):  
Seid Hajdarević ◽  
Murčo Obućina ◽  
Elmedin Mešić ◽  
Sandra Martinović
Keyword(s):  
Stress Analysis ◽  
Strain Analysis ◽  
Wood Products ◽  
Orthotropic Materials ◽  
Stress And Strain ◽  
Elastic Model ◽  
Layer By Layer ◽  
Element Analysis ◽  
Experimental Stress Analysis ◽  
Linear Elastic

In this paper, the stress and strain analysis of common laminated wood seat shell is performed. Experimental stiffness evaluation is conducted by measuring displacement of the point on the backrest, and experimental stress analysis is carried out by tensometric measuring at the critical transition area from the seat to the backrest. Finite element analysis is carried out layer by layer with a “2D linear elastic model” for orthotropic materials. Good matching is found between numerical and experimental results of displacement. It is also shown that the results of the principal stress in the measurement points of the seat shell compare favourably with experimental data. The applied in-plane stress analysis of each individual veneer is not applicable for interlaminar stress calculations that are a significant factor in curved forms of laminated wood. Curved forms of laminated wood products require more complex numerical analysis, but the method can be used to achieve approximate data in early phase of product design.

Numerical study about the effect of bainitic traces on plasticity in ferritic-pearlitic railway wheels

2020 ◽  
pp. 095440972096088
Author(s):  
Nicola Zani ◽  
Thibaut Chaise ◽  
Andrea Ghidini ◽  
Michela Faccoli ◽  
Angelo Mazzù
Keyword(s):  
Numerical Study ◽  
Threshold Value ◽  
Stress And Strain ◽  
Railway Wheel ◽  
Initiation And Propagation ◽  
The Difference ◽  
Wear Response ◽  
Numerical Finite Element ◽  
As Stress ◽  
Railway Wheels

Wheel microstructure significantly affects railway wheel performances. Although wheel microstructure traditionally consists of pearlite-ferrite, it is possible to detect some intermediate structures traces, for instance bainite, generated during the thermal treatment process. The difference in mechanical properties between pearlite and bainite causes stress and strain incompatibilities at their interface, and this gives rises to early crack initiation and propagation. This paper aims at investigating the presence of bainitic traces in a ferritic-pearlitic microstructure of a railway wheel through semi-analytical and numerical finite element simulations. The effect of bainitic spot shape, dimension and distribution is studied as well as stress and plastic strain in the proximity of the heterogeneities is analysed. The radius-interaxis ratio parameter, defined as the ratio between the bainitic spots radiuses and the distance between two neighbouring spots centres, is introduced to study the effect of circular-sectioned bainitic spots on the steel plasticity. It is observed that the bainitic traces form regions subjected to overstress and overstrain in the ferritic-pearlitic matrix and that the area of the bainitic spots influences the size of these regions. The bainitic spot distribution is found out to increase further the overstrain in case the radius/interaxis ratio is higher than 0.2, corresponding to about 11% of bainite in the ferritic-pearlitic matrix. Beyond this threshold value, bainite traces can compromise both RCF and wear response.

Experimental and Numerical Study of Plain-Woven Aramid Fabric

2013 ◽  
Vol 856 ◽  
pp. 74-78 ◽  
Author(s):  
E.A. Flores-Johnson ◽  
J.G. Carrillo ◽  
R.A. Gamboa ◽  
L. Shen
Keyword(s):  
Tensile Properties ◽  
Failure Strain ◽  
Numerical Study ◽  
Element Model ◽  
Extraction Process ◽  
Friction Material ◽  
Woven Fabric ◽  
Elastic Model ◽  
Aramid Fabric ◽  
The Individual

In this paper, the tensile properties of plain-woven aramid fabric style 724 (Kevlar® 129 fibre, 1000 denier, 24×24 yarns per inch) and the tensile properties of individual aramid yarn extracted from the fabric are presented. It was found that this fabric is balanced with less than 5% difference in strength between the warp and weft directions. The mechanical properties of the individual yarns were found to be lower than those reported for Kevlar® 129 fibre, which is explained by the fact that the yarns were damaged during the extraction process or weaving process. A 3D finite-element model of the tensile testing of plain-woven fabric was built at the mesoscale in Abaqus/Explicit by modelling individual crimped yarns and taking into account friction. Material properties and yarn geometry for the model were obtained from experimental observations. An orthotropic elastic model with failure criterion based on the yield stress was used. Numerical results were analysed and compared with experimental results. It was found that the numerical model can reproduce the physical experimental observations, the yield strength and the failure strain.

A Numerical Study and Design of Turbine Blade under High Temperature and Rotational Speed Using FEM

2006 ◽  
Vol 324-325 ◽  
pp. 1063-1066
Author(s):  
Jang Hyun Lee ◽  
Kyung Ho Lee ◽  
Kyung Su Kim
Keyword(s):  
High Temperature ◽  
High Cycle Fatigue ◽  
Numerical Study ◽  
Low Cycle Fatigue ◽  
Turbine Blades ◽  
Stress And Strain ◽  
Cycle Fatigue ◽  
Fatigue Load ◽  
Turbine Wheel ◽  
Revolution Speed

The turbine wheels of a turbocharger are operated at high revolution speed in high temperature inlet gas. Alloy 713LC blades of the turbine wheel broke in an hour the during a model test. Two failures and several cracks were found in the turbine blades. Failures in blades are suspected to occur as a result of thermal mechanical stresses or fatigue load and other cause such as creep-rupture and resonant vibration. The present study investigates the possible causes of the failure of these blades. FEM (Finite Element Method) was used to calculate the thermal centrifugal stresses and natural frequency to find the cause of failures. LCF (Low Cycle Fatigue) life of blades was roughly estimated by using the stress and strain level calculated by FEM. The investigation indicates that the failures were associated with resonant forces and HCF (High Cycle Fatigue).

STRESS ANALYSIS OF INTERNAL CAROTID ARTERY WITH LOW STENOSIS LEVEL: THE EFFECT OF MATERIAL MODEL AND PLAQUE GEOMETRY

2017 ◽  
Vol 17 (06) ◽  
pp. 1750098 ◽  
Author(s):  
AZADEH SHAHIDIAN ◽  
ARASH GHORBANNIA HASSANKIADEH
Keyword(s):  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Strain Distribution ◽  
Internal Carotid ◽  
Material Model ◽  
Disease Diagnosis ◽  
Plaque Morphology ◽  
Stress And Strain ◽  
Elastic Model ◽  
Real Geometry

Stress concentration in carotid stenosis has been proven to assist plaque morphology in disease diagnosis and vulnerability. This work focuses on numerical analysis of stress and strain distribution in the cross-section of internal carotid artery using a 2D structure-only method. The influence of four different idealized plaque geometries (circle, ellipse, oval and wedge) is investigated. Numerical simulations are implemented utilizing linear elastic model along with four hyperelastic constitutive laws named neo-Hookean, Ogden, Yeoh and Mooney–Rivlin. Each case is compared to the real geometry. Results show significant strength of oval and wedged geometries in predicting stress and strain values. Our results emphasize that Yeoh and Ogden hyperelastic materials are more reliable in stress prediction with errors less than 3%. The same concept is observed in locating critical stresses where oval and wedged plaque geometries are the most accurate models. Similar results are observed in predicting maximum principal elastic strain with errors less than 1%. However, the strain distribution in idealized plaque models showed a considerable difference in comparison with real geometry.

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