Radial Transportation of Particle With a Single-Axis Transducer and the Double Reflectors

2016 ◽  
Author(s):  
Huijuan Dong ◽  
Peng Zhang ◽  
Panagiotis Papouris
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Materials Science ◽  
Critical Parameters ◽  
Acoustic Levitation ◽  
Long Distance ◽  
Chamber Height ◽  
Element Simulation ◽  
Optimal Distance ◽  
Acoustic Levitator

Acoustic levitation and transportation techniques has a wide applications in fields of biology, chemistry and materials science. We present an acoustic levitator consisted of one single-axis Langevin piezoelectric transducer and two reflectors. The 24.2mm-long-distance radial transportation of the Styrofoam particle is achieved by changing the resonant chamber height between the two reflectors. The optimal distance between the axis of the upper and the lower reflectors is determined as 7mm through the method of the finite element simulation. Analytical results are verified by the experimental data which also provide critical parameters to build a radial particles transportation apparatus.

Finite Element Simulation of RC Beam Strengthened with FRP

2012 ◽  
Vol 446-449 ◽  
pp. 3229-3232
Author(s):  
Chao Jiang Fu
Keyword(s):  
Experimental Data ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Finite Element Simulation ◽  
Fiber Reinforced Polymer ◽  
Rc Beam ◽  
The Finite Element Method ◽  
Reinforced Polymer ◽  
Element Simulation

The finite element modeling is established for reinforced concrete(RC) beam reinforced with fiber reinforced polymer (FRP) using the serial/parallel mixing theory. The mixture algorithm of serial/parallel rule is studied based on the finite element method. The results obtained from the finite element simulation are compared with the experimental data. The comparisons are made for load-deflection curves at mid-span. The numerical analysis results agree well with the experimental results. Numerical results indicate that the proposed procedure is validity.

scholarly journals Effect of the Construction of Carbon Fiber Plate Insert to Midsole on Running Performance

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5156
Author(s):  
Fengqin Fu ◽  
Ievgen Levadnyi ◽  
Jiayu Wang ◽  
Zhihao Xie ◽  
Gusztáv Fekete ◽  
...  
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Finite Element Simulation ◽  
Independent Effect ◽  
Marathon Running ◽  
Joint Mechanics ◽  
Long Distance ◽  
Running Performance ◽  
Element Simulation ◽  
Fiber Plate

In this paper, to investigate the independent effect of the construction of the forefoot carbon-fiber plate inserted to the midsole on running biomechanics and finite element simulation, fifteen male marathon runners were arranged to run across a runway with embedded force plates at two specific running speeds (fast-speed: 4.81 ± 0.32 m/s, slow-speed: 3.97 ± 0.19 m/s) with two different experimental shoes (a segmented forefoot plate construction (SFC), and a full forefoot plate construction (FFC)), simulating the different pressure distributions, energy return, and stiffness during bending in the forefoot region between the SFC and FFC inserted to midsole. Kinetics and joint mechanics were analyzed. The results showed that the footwear with SFC significantly increased the peak metatarsophalangeal joint (MTPJ) plantarflexion velocity and positive work at the knee joint compared to the footwear with FFC. The results about finite element simulation showed a reduced maximum pressure on the midsole; meanwhile, not significantly affected was the longitudinal bending stiffness and energy return with the SFC compared to the FFC. The results can be used for the design of marathon running shoes, because changing the full carbon fiber plate to segment carbon fiber plate induced some biomechanical transformation but did not significantly affect the running performance, what is more, reducing the peak pressure of the carbon plate to the midsole by cutting the forefoot area of the carbon fiber plate could be beneficial from a long-distance running perspective for manufacturers.

Microstructures Finite Element Simulation of Laser Cladding Layer Regulated by Micro-Forging

2011 ◽  
Vol 328-330 ◽  
pp. 1568-1571 ◽  
Author(s):  
Ju Zhou ◽  
Chang Jun Qiu ◽  
Xi Yang Cheng
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Laser Cladding ◽  
Avrami Equation ◽  
Cladding Layer ◽  
Whole Process ◽  
Element Simulation ◽  
Calculation Results ◽  
Set Up

In the whole process of micro-forging regulation laser cladding layer, the microstructure structure of cladding layer would change. In order to establish the microstructure evolution of the whole process, firstly re-crystallization model was set up based on Avrami equation and experimental data, and various material constants were gained with regress; secondly calculation for the model was carried out on DEFORM-2D,then the results were compared with experimental data, which showed that calculation results of this model kept good consistency with experimental data, and proved that the model could be applied in a full size finite element simulation of the micro forging process.

Fracture Response of Girth-Welded Pipeline With Canoe Shape Embedded Crack Subjected to Large Plastic Deformation

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Lie Seng Tjhen ◽  
Zhang Yao ◽  
Zhao Hai Sheng
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Internal Pressure ◽  
Structural Integrity ◽  
Biaxial Loading ◽  
Finite Element Simulations ◽  
Critical Parameters ◽  
Large Plastic Deformation ◽  
Long Distance ◽  
Fracture Assessment

Long-distance offshore pipelines always suffer large plastic deformation during installation and operation. Accompanied by high internal pressure, potential flaws are found to initiate from the girth welds, and this brings a significant challenge to the structural integrity of the pipelines. The currently used procedures for fracture assessment of pipelines are usually stress based, which are unsuitable for application to cracked pipeline subjected to large plastic deformation. Therefore, the aim of this paper is to investigate the fracture assessment of pipeline subjected to large plastic deformation and identify and understand the critical parameters influencing the fracture responses under actual loading conditions. The evolution of crack tip opening displacement (CTOD) of a pipeline segment with an embedded canoe shape crack located in the middle of the girth weld is investigated under pure bending and biaxial loading through 3D elastic–plastic finite-element simulations. The effects of crack width, crack length, pipeline thickness, material hardening, and internal pressure on fracture response are discussed. Finally, a strain-based failure assessment diagram (FAD) is developed, and comparison between fracture assessment by BS7910:2013 and finite-element simulations concludes that the former produces conservative predictions for deep crack.

scholarly journals Comparison of Hyperelastic Models for Rubber-Like Materials

2006 ◽  
Vol 79 (5) ◽  
pp. 835-858 ◽  
Author(s):  
G. Marckmann ◽  
E. Verron
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Constitutive Equations ◽  
Loading Conditions ◽  
Material Parameters ◽  
Fitting Procedure ◽  
Element Simulation ◽  
Different Types ◽  
Hyperelastic Models

Abstract The present paper proposes a thorough comparison of twenty hyperelastic models for rubber-like materials. The ability of these models to reproduce different types of loading conditions is analyzed thanks to two classical sets of experimental data. Both material parameters and the stretch range of validity of each model are determined by an efficient fitting procedure. Then, a ranking of these twenty models is established, highlighting new efficient constitutive equations that could advantageously replace well-known models, which are widely used by engineers for finite element simulation of rubber parts.

scholarly journals Formation of Arbitrary Patterns in Ultraviolet Cured Polymer Film via Electrohydrodynamic Patterning

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Xin Li ◽  
Yucheng Ding ◽  
Jinyou Shao ◽  
Hongmiao Tian ◽  
Hongzhong Liu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Polymer Film ◽  
Applied Voltage ◽  
Great Influence ◽  
Critical Parameters ◽  
High Fidelity ◽  
Field Coupling ◽  
Element Simulation ◽  
Electrohydrodynamic Patterning

Electrohydrodynamic patterning of arbitrary patterns is achieved by optimizing the critical parameters (applied voltage and spacer height). The applied voltage has a great influence on the fidelity of L-shaped line structures with different sizes. The L-shaped line structures with high fidelity are obtained by using the moderate applied voltage. The spacer height has a great influence on the fidelity of square structures with different sizes. The square structures with high fidelity are obtained by using the low height spacer. The multi-field coupling transient finite element simulation demonstrates that the lack of polymer owing to the high height spacer leads to the formation of defects.

FINITE ELEMENT SIMULATION OF A NANO-SCRATCH TEST OF BONE

2009 ◽  
Vol 09 (03) ◽  
pp. 427-435
Author(s):  
SATYA PRASAD PARUCHURU ◽  
XIAODU WANG
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Bone Tissue ◽  
Age Groups ◽  
Element Model ◽  
Scratch Test ◽  
Bone Properties ◽  
Element Simulation ◽  
Energy Dissipated

Quality of bone tissue deteriorates with age and disease. Mechanical techniques that evaluate properties of cadaver bone help in understanding mechanisms behind aging and disease and by extension in the quality assurance of engineered bone tissue. Use of inverse engineering methods help in interpreting bone properties from experimental data. Correlation of these properties to noninvasive or minimally invasive measurements aids in assessment of the quality and fracture risk of live bone tissue. A pilot study on different age groups has shown that the removal energy dissipated per volume during the scratch may be a representative of the toughness of bone. A 3D finite element model was proposed to perform numerical simulation of bone scratch tests in order to aid in formulation of a quantitative scratch approach and assessment of in-situ properties by inverse engineering methods. Finite element modeling procedures for simulation of bone scratch test were developed. Simulation of scratch test was carried out using contact analysis. The results of finite element simulation were compared with experimental data. The simulation gave a preliminary understanding of deformation produced in the bone scratch test.

scholarly journals Finite Element Simulation of Multi-Scale Bedding Fractures in Tight Sandstone Oil Reservoir

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 131 ◽  
Author(s):  
Qianyou Wang ◽  
Yaohua Li ◽  
Wei Yang ◽  
Zhenxue Jiang ◽  
Yan Song ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Principal Stress ◽  
Oil And Gas ◽  
Maximum Principal Stress ◽  
Critical Parameters ◽  
Yanchang Formation ◽  
Multi Scale ◽  
Element Simulation ◽  
Minimum Principal Stress

Multi-scale bedding fractures, i.e., km-scale regional bedding fractures and cm-scale lamina-induced fractures, have been the focus of unconventional oil and gas exploration and play an important role in resource exploration and drilling practice for tight oil and gas. It is challenging to conduct numerical simulations of bedding fractures due to the strong heterogeneity without a proper mechanical criterion to predict failure behaviors. This research modified the Tien–Kuo (T–K) criterion by using four critical parameters (i.e., the maximum principal stress (σ1), minimum principal stress (σ3), lamina angle (θ), and lamina friction coefficient (μlamina)). The modified criterion was compared to other bedding failure criteria to make a rational finite element simulation constrained by the four variables. This work conducted triaxial compression tests of 18 column samples with different lamina angles to verify the modified rock failure criterion, which contributes to the simulation work on the multi-scale bedding fractures in the statics module of the ANSYS workbench. The cm-scale laminated rock samples and the km-scale Yanchang Formation in the Ordos Basin were included in the multi-scale geo-models. The simulated results indicate that stress is prone to concentrate on lamina when the lamina angle is in an effective range. The low-angle lamina always induces fractures in an open state with bigger failure apertures, while the medium-angle lamina tends to induce fractures in a shear sliding trend. In addition, the regional bedding fractures of the Yanchang Formation in the Himalayan tectonic period tend to propagate under the conditions of lower maximum principal stress, higher minimum principal stress, and larger stratigraphic dip.

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