scholarly journals Calibration of a modified Johnson-Cook model using the Virtual Fields Method and a heterogeneous thermo-mechanical tensile test

2021 ◽  
pp. 106511
Author(s):  
J.M.P. Martins ◽  
S. Thuillier ◽  
A. Andrade-Campos
Keyword(s):  
Tensile Test ◽  
Virtual Fields Method ◽  
Mechanical Tensile ◽  
Cook Model

scholarly journals Corneal Biomechanical Properties Characterization Using Air-jet Indentation Based Optical Coherence Tomography System (AIOCT)

2019 ◽  
Vol 256 ◽  
pp. 01004 ◽  
Author(s):  
Li-ke Wang ◽  
Jia-ying Zhang ◽  
Tian-jie Li ◽  
Xue-yong Zhang ◽  
Lei Tian ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Tensile Test ◽  
Indentation Test ◽  
Biomechanical Properties ◽  
Tomography System ◽  
Air Jet ◽  
Custom Made ◽  
Mechanical Tensile ◽  
Corneal Biomechanical Properties

We proposed a novel method together with system to quantify the corneal biomechanics. The objectives of this study are to develop a method to measure the corneal biomechanical properties in vivo and to evaluate the performance of AIOCT system. A novel AIOCT system was established and a mathematical model was built on the basis of the current air-jet indentation method. Experiments were performed to evaluate the mechanical properties of eleven custom-made silicone corneal mimicking phantoms by the AIOCT system under different intraocular pressures (IOP). The results were then compared with those measured by the standard mechanical tensile test and indentation test. The phantom’s moduli were ranged from 0.08 to 1.03 MPa according to the tensile and indentation test. The elastic moduli of corneal silicone phantoms (Eairjet) were measured using the AIOCT system with the proposed mathematical model at four IOPs (0.6, 15.3, 29.8, and 44.7 mmHg). The Eairjet were agreed well with the corresponding moduli (Etensile) measured by the tensile test (Eairjet = 1.188 Etensile, R2 = 0.925). The preliminary results showed that this technique was capable of measuring corneal biomechanical properties in vivo and it may provide a clinical potential non-invasive and non-contact means to the diagnosis of keratoconus suspects in the future.

Effect of Nitrogen on Mechanical Properties of 20MnSi at High Temperature

2011 ◽  
Vol 194-196 ◽  
pp. 213-217
Author(s):  
Ji Chun Yang ◽  
Nan Liu
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Test ◽  
Grain Boundaries ◽  
Grain Refinement ◽  
Sem And Tem ◽  
Mechanical Tensile

The effect of nitrogen on the mechanical properties of 20MnSi steel at high temperature was investigated. Mechanical tensile test was conducted using a Gleeble-1500D. Microstructure and fractograms were analyzed using SEM and TEM. The results indicate that nitrogen in concentration of 0.4 ~ 0.6% improves the grain boundaries and grain refinement, and thus the strength and section shrinkage and plasticity of the steel. Further increase in concentration of nitrogen has little effect on section shrinkage.

The Dynamic Impact Behavior of Ti50Ni47Fe3 Shape Memory Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 1969-1972
Author(s):  
Fu Shun Liu ◽  
Yanping Qian ◽  
Hui Bin Xu
Keyword(s):  
Shape Memory Alloy ◽  
Tensile Test ◽  
Shape Memory ◽  
Wide Temperature Range ◽  
Impact Test ◽  
Impact Behavior ◽  
Dynamic Impact ◽  
Dynamic Mechanical Behavior ◽  
Different Temperatures ◽  
Mechanical Tensile

Static and dynamic mechanical behavior of Ti50Ni47Fe3 shape memory alloy was investigated by mechanical tensile test and instrumention impact test under a wide temperature range from -196°C to 20°C. The instrumention impact test was carried out under different temperatures at which the alloys are with martensite, austenite and R phase, respectively. It is found that the alloy with austenite performed the best ductility, the samples with martensite and R phase exhibit superior and inferior ductility, respectively.

Mechanical tensile test of the full-size ITER TF conductor jacket materials at 4.2K

2013 ◽  
Vol 88 (11) ◽  
pp. 2810-2813 ◽  
Author(s):  
Zhixiong Wu ◽  
Laifeng Li ◽  
Chuanjun Huang ◽  
Rongjin Huang ◽  
Shanfeng Li ◽  
...  
Keyword(s):  
Tensile Test ◽  
Full Size ◽  
Mechanical Tensile

Size Effect of Recycled Material to Tensile Properties of PC

2014 ◽  
Vol 1025-1026 ◽  
pp. 278-282 ◽  
Author(s):  
Vojtech Senkerik ◽  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Particle Size ◽  
Tensile Test ◽  
Tensile Properties ◽  
Dust Particles ◽  
Original Material ◽  
Material Degradation ◽  
Material Parameters ◽  
Effect Of Particle Size ◽  
Mechanical Tensile ◽  
Recycled Material

The aim of this research paper is to study the effect of particle size of recycled polymeric material to mechanical tensile properties. During grinding particles are formed which have a different size, shape and surface, from larger pieces to dust particles. During processing these particles melt at different rates depending on their size. For example they can cause material degradation or lack of melt homogeneity. Several recycled mixtures were prepared that had differed particle size after crushing. The recycled material is always the same as is the original material. The studied material was a Polycarbonate. Testing was performed using a tensile test. When comparing a virgin polycarbonate with recycled mixtures, the particle size of the recycled material affects some of the material parameters quite substantially, but it had no effect on some other properties.

Material models and finite analysis of additively printed polymer composites

2018 ◽  
Vol 53 (3) ◽  
pp. 361-371 ◽  
Author(s):  
Jong Eun Ryu ◽  
Eduardo Salcedo ◽  
Hyeok Jong Lee ◽  
Sung Jun Jang ◽  
Eun Young Jang ◽  
...  
Keyword(s):  
Tensile Test ◽  
Computational Design ◽  
Test Results ◽  
Element Analysis ◽  
Material Models ◽  
Base Materials ◽  
The Finite Element Analysis ◽  
Digital Material ◽  
Mechanical Tensile ◽  
Two Parameter

There are urgent needs to characterize and model the mechanical property of additively manufactured composite materials, known as the digital materials, for the computational design and simulation. In this study, most utilized digital material samples, which are the mixture of base polymers, Tango Black+ and Vero White+, by PolyJet (Stratasys) are chosen. Four polynomial models (Neo Hookean model, and two-, three-, and five-parameter Mooney–Rivlin models) are used to fit mechanical tensile test results up to 30% of strain. The material models were adopted in the finite element analysis simulating the tensile test to validate their accuracy. The simulation results based on the two-parameter Mooney–Rivlin model predict the stress at 30% strain with small errors (8.2, 10.5, 0.9, 5.0, and 8.0 for Tango Black+, DM40, DM50, DM60, and DM70, respectively). Additionally, scanning electron microscopy was utilized to analyze the fracture surface of the base materials (Tango Black+ and Vero White+) and the digital materials.

scholarly journals Dimpling of CR4 Sheet and Its Parametric Optimization using Taguchi Method

2020 ◽  
Vol 8 (5) ◽  
pp. 2855-2858
Keyword(s):  
Taguchi Method ◽  
Tensile Test ◽  
Process Parameters ◽  
Signal To Noise Ratio ◽  
Experimental Tests ◽  
Material Design ◽  
Tensile Tests ◽  
Property A ◽  
Steel Material ◽  
Mechanical Tensile

Dimple sheet is formed using cold rolling or press braking process. Wider use of dimple sheet in various fields may create interest in the study of dimple sheet. This paper describes a numerical modeling approach and results into the mechanical property. A mechanical tensile test on plain sheet and dimpled sheet CR4 steel material were conducted for evaluation of numerical results. A finite element explicit dynamic analysis approach is used to simulate the tensile test. Tensile tests are carried out as per orthogonal array of Taguchi method. True stress–strain data obtained from tests were used to optimize the process parameters, this could correlate to the increase in the strength of the dimpled sheet as observed in experimental tests and simulations.. The process parameters of dimple forming such as dimple depth, dimple diameter and distance between dimples are analyze for strength of sheet on CR4 steel material. Design of experiments is implemented for to optimize process parameters by using a Taguchi method design. The effect of the process parameters on response have studied by means of main effect plots which are developed by SN ratio and optimum parameter is selected on the basis of signal to noise ratio.

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