Open Access
ABSTRACT
Jurica Sorić*, Boris Jalušić, Tomislav Lesičar, Filip Putar, Zdenko Tonković
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 1-1, 2021, DOI:10.32604/icces.2021.08043
Abstract In modeling of material deformation responses, the physical
phenomena such as stress singularity problems, strain localization and modeling
of size effects cannot be properly captured by means of classical continuum
mechanics. Therefore, various regularization techniques have been developed to
overcome these problems. In the case of gradient approach the implicit gradient
formulations are usually used when dealing with softening. Although the
structural responses are mesh objective, they suffer from spurious damage
growth. Therefore, a new formulation based on the strain gradient continuum
theory, which includes both strain gradients and their stress conjugates, has been
proposed. In this way, a physically… More >
Open Access
ABSTRACT
Ney Augusto Dumont
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 2-2, 2021, DOI:10.32604/icces.2021.08187
Abstract The mathematical modeling of microdevices, in which structure and
microstructure have approximately the same scale of magnitude, as well as of
macrostructures of markedly granular or crystal nature (microcomposites),
demands a nonlocal approach for strains and stresses. The present proposition is
based on a simplified strain gradient theory laid down by Aifantis, which has also
been applied mainly by Beskos and collaborators in the context of the boundary
element method. This paper is an extension of a presentation made during the
ICCES 2014 Conference in Crete, Greece, now relying on machine-precision
evaluation of all singular and hypersingular integrals required in… More >
Open Access
ABSTRACT
Jingfa Li1, Daobing Wang1, Bo Yu1,*, Shuyu Sun2, Dongliang Sun1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 3-3, 2021, DOI:10.32604/icces.2021.08209
Abstract In natural gas engineering, the numerical simulation plays a significant role in the exploration, production and optimization of natural gas
reservoir. However, numerical simulations of compressible gas flow in porous media are always expensive due to the gas compressibility and nonlinear
properties. To save the computational cost, in this work we present a multigrid
coupled discrete empirical interpolation method (MG-DEIM) to speedup the simulation of compressible gas porous flow. In this MG-DEIM framework, the core idea is that the multigrid method based on the full approximate scheme
(FAS) is used to solve the flow equation (a pressure equation); for the… More >
Open Access
ABSTRACT
Ivano Benedetti1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 4-6, 2021, DOI:10.32604/icces.2021.08213
Abstract A recently developed novel three-dimensional (3D) computational
framework for the analysis of polycrystalline materials at the grain scale is
described in this lecture. The framework is based on the employment of: i) 3D
Laguerre-Voronoi tessellations for the representation of the micro-morphology
of polycrystalline materials; ii) boundary integral equations for the
representation of the mechanics of the individual grains; iii) suitable cohesive
traction-separation laws for the representation of the multi-physics behavior of
the interfaces (either inter-granular or trans-granular) within the aggregate, which
are the seat of damage initiation and evolution processes, up to complete decohesion and failure. The lecture will describe… More >
Open Access
ABSTRACT
Shichao Ma1, 2, Xin Ning1, 2, Pengbi Cui1, 2, Lili Ren1, 2, Liang Wang3
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 7-8, 2021, DOI:10.32604/icces.2021.08233
Abstract Vibration isolation design is essential for the spacecraft
capture operation in the on-orbit servicing missions. And contact impact is also inevitable in this process, which can be simplified as
piece-smooth ordinary differential equations and generate abundant
dynamics phenomena. Therefore, it is especially important to study
the contact dynamics responses. And global behavior research can
be visualized the characteristics of system. Aiming to this issue, the
global dynamics of a single-degree-of-freedom non-smooth
mechanical system in a vibration isolation experiment is studied by
using advanced numerical procedure in this paper. For this non- smooth impact and friction oscillator, the forcing frequency is… More >
Open Access
ABSTRACT
Koji Fukudome1,*, Takuya Wada1, Toma Takahashi1, Makoto Yamamoto1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 9-9, 2021, DOI:10.32604/icces.2021.08298
Abstract Icing is a phenomenon that super-cooled droplets impinge and accrete
on a solid surface. When the icing occurs on aircraft wings, it deteriorates
aerodynamic performances of the wings and the blade cascades of the engine,
which may lead to severe accidents. Although number of investigations have
been performed both experimentally and numerically [1], the icing shape
prediction is now not practically complete due to the complex aspect of icing
phenomena. In the previous research, Toba et al. [2] employed an explicitmoving particles simulation method (referred as E-MPS method), which was
based on the Lagrangian approach, to reproduce the icing process… More >
Open Access
ABSTRACT
Miroslav Repka1,*, Jan Sladek1, Vladimir Sladek1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 10-10, 2021, DOI:10.32604/icces.2021.08308
Abstract The flexoelectric effect is investigated in quantum dot (QD)
nano-sized structures. The lattice mismatch between QD and matrix
results in non-uniform strains and presence of the strain gradients in the
structure. The strain gradients induces the change of the polarization in
QD structure as a consequence of the flexoelectric effect. When the
dimensions of the QDs are of the same order of magnitude as the material
length scale, gradient elasticity theory should be used to account for the
size dependent of such nano-sized QDs. In this work the flexoelectric
theory is applied for 3D analysis of QDs with the functionally… More >
Open Access
ABSTRACT
Yuan Zhu1, 2, Xin Ning1, 2, Yao Zhang1, 2, Yuwan Yin1, 2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 11-12, 2021, DOI:10.32604/icces.2021.08311
Abstract High performance of the spacecraft structure is required in
the special environment, it includes mechanical performance and
operational performance, etc. When performing tasks, the
spaceborne equipment requires high precision. Therefore, the design
of lightweight, high stability and high reliability structure is essential
for spacecraft. Topology optimization is widely used in structural
design. However, there are some problems in the structure after
macro topology optimization, such as checkerboard, local optimal
solution and other phenomena. Despite a long calculation period, the
obtained structure is often not smooth enough and hard to
manufacture. Aiming to this issue, this paper proposes a combined
method… More >
Open Access
ABSTRACT
Marco Lo Cascio1, Marco Grifò1, Alberto Milazzo1, Ivano Benedetti1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 13-13, 2021, DOI:10.32604/icces.2021.08335
Abstract The Virtual Element Method (VEM) [1] is a recent numerical
technique that is capable of dealing with very general polygonal and polyhedral
mesh elements, including irregular or non-convex ones. Because of this feature,
the VEM ensures noticeable simplification in the data preparation stage of the
analysis, especially for problems whose analysis domain features complex
geometries, as in the case of computational micromechanics problems [2]. The
Boundary Element Method (BEM) [3] is a well-known, extensively used and
efficient numerical technique that has been successfully employed for the
computational homogenization of materials with complex morphologies [4]. Due
to its underlying formulation, the… More >
Open Access
ABSTRACT
Masaya Suzuki1,*, Manabu Ueno2, Koji Fukudome2, Yoji Okita1, Makoto Yamamoto2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 14-14, 2021, DOI:10.32604/icces.2021.08337
Abstract Recently, ceramic matrix composites (CMCs) are expected to utilize
for the components of gas turbine engines due to its low density, high strength,
and high rigidity in the high-temperature condition. The environmental barrier
coating (EBC) is a key technology for the practical application of CMC to
prevent surface regression from particulate and water vapor environments.
However, the anti-erosion characteristics of CMC and EBC have not been
clarified. In the present study, the authors performed numerical simulations of
particulate erosion phenomena in a high-pressure turbine first stage to
investigate the differences in the damage pattern and the performance
between particle sizes.… More >
Open Access
ABSTRACT
Ayumi Takahashi1,*, Tomoyuki Tsuchiya2, Keiichi Motoyama3, Kazuhito Misaji1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 15-15, 2021, DOI:10.32604/icces.2021.08354
Abstract The seismic-isolation laminated rubber is used as a means of
suppressing damage to the structures caused by an earthquake. To design the
seismically isolated structure, it is important to calculate the dynamic response
reflecting the rubbers characteristics accurately. The authors have applied the
nonlinear vibration analysis method using the restoring force model of the power
function type to the seismic response analysis of seismic isolation rubber in
horizontal unidirectional [1-3]. However, when seismic isolation laminated
rubber is loaded in horizontal bi-direction, the seismic isolation laminated rubber
is torsional deformed and breaks with less force than when loaded in
unidirectional. It… More >
Open Access
ABSTRACT
Yousuke Shimoda1, Takahiro Matsumori1, Kazuki Sato1, Tatsuro Hirano1, Naoya Fukushima1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 16-16, 2021, DOI:10.32604/icces.2021.08337
Abstract Along with rapid development of computer technologies, a wide range
of turbulent flows have been investigated by direct numerical simulations and the
big databases have been built throughout the world. From the DNS results, we
can investigate turbulent characteristics in three-dimensional space and time. In
the laboratory experiment, we can apply sophisticated laser diagnostics technique
to measure flow field non-invasively in research. On actual equipment, it is very
difficult to get the flow field data away from the wall. We can measure only wall
information, such as wall shear stresses and pressure. When we predict
turbulence from wall information, we… More >
Open Access
ABSTRACT
Ei Yamamoto1,*, Yuki Tanifuji2, Masaya Nishimoto2, Yuki Kawamura2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 17-17, 2021, DOI:10.32604/icces.2021.08434
Abstract Bone tissue is a viscoelastic material which shows time-dependent
mechanical manner. Moreover, it is known that bone microdamage is generated
by physiological normal mechanical loading in vivo [1-3]. In order to know basic
insight into the adverse effects of creep loading on bone strength, in the present
study, we focused on the mechanical behavior of cortical bone after nondestructive creep loading at high stress magnitude. Cylindrical specimens were
obtained from cortical bone in the longitudinal and tangential direction of bovine
femur. We statically applied a compressive stress to the specimens (creep group)
for 24 hours. The specimens without creep loading… More >
Open Access
ABSTRACT
Yun Teng1, Zhendong Sha1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 18-18, 2021, DOI:10.32604/icces.2021.08471
Abstract For all engineering materials, the flaws are introduced inevitably from
fabrication, mechanical damage, and corrosion. These stress raisers always
induce catastrophic failures and it is therefore of great importance to understand
the effect of flaws on the mechanical properties of engineering materials. The
effect of flaws on metallic glasses (MGs) is a debatable topic because many
relevant works have reported notch strengthening, notch weakening and notch
insensitivity for brittle MGs. The significant notch strengthening of MGs was
attributed to the transition of failure mechanism, from catastrophic shear banding
to ductile fracture. Here we investigate systematically the influence of notch
geometry… More >
Open Access
ABSTRACT
Makoto Yamamoto1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 19-19, 2021, DOI:10.32604/icces.2021.08478
Abstract In a turbine of a jet engine, deposition phenomenon is often observed.
Deposition is a phenomenon that particles such as volcanic ash, sand and dust
passing through a combustion chamber of a jet engine are melt, rapidly cooled
and then accumulate on the turbine blade and end-wall surfaces. Deposition is
one of critical problems when aircraft flies in a cloud with many particles.
Obviously, deposition can degrade the aerodynamic performance of the turbine
blade and vane, and make partial or complete blockage of film-cooling holes. As
the result, deposition deteriorates safety and life time of the turbine. In the past… More >
Open Access
ABSTRACT
Shotaro Taguchi1,*, Satoru Yoneyama2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 20-20, 2021, DOI:10.32604/icces.2021.08535
Abstract This study proposes a method for identifying viscoelastic properties
that considers time- and temperature dependence of Poisson's ratio using inverse analysis. In this method, displacement distribution, which are input values of inverse analysis, is measured by digital image correlation [1], and
unknown material properties are determined using the virtual fields method [2]. This method targets plane stress condition and the Poisson's ratio of the
viscoelastic body depends on the time and temperature [3]. This study focuses
on the correspondence law and proposes a method for calculating stresses considering time- and temperature dependence of Poisson's ratio. In-plane
strains are measured and… More >
Open Access
ABSTRACT
Kengo Fujii1, Satoru Yoneyama1, Ayaka Suzuki2, Hiroshi Yamada2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 21-21, 2021, DOI:10.32604/icces.2021.08538
Abstract This study establishes a method to measure the displacement and
strain of rubber with large and fast deformations using digital image correlation.
In order to elucidate the mechanism of growth of a crack and to investigate the
complex behavior of a crack tip, which is important for that purpose,
displacement and strain near the crack where large strains are locally generated
by stress concentration are measured. A displacement restraint rubber sheet of a
strip fixed at upper and lower ends with an initial crack is used as a test piece. A
constant rate displacement load is applied to it, its… More >
Open Access
ABSTRACT
Wei Jiang1,*, Takuya Hara1, Motoharu Fujigaki1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 22-23, 2021, DOI:10.32604/icces.2021.08551
Abstract In this study, a sampling moire method in which parallel laser lines
were generated in a camera using a diffraction grating was proposed. A green
laser of line projection function, a diffraction grating and an industrial camera
were used as an experimental device. Object images with laser line projection
before and after displacement were taken by the camera. Displacements that
calculated by a sampling moire method and a method of averaging center-ofgravity were be compared. Results show that the proposed method is more
precision than method of averaging center-of-gravity. More >
Open Access
ABSTRACT
Shuyu Sun1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 24-25, 2021, DOI:10.32604/icces.2021.08590
Abstract Modeling and simulation of multiphase flow in porous media have
been a major effort in reservoir engineering and in environmental study.
Petroleum engineers use reservoir simulation models to manage existing
petroleum fields and to develop new oil and gas reservoirs, while environmental
scientists use subsurface flow and transport models to investigate and compare
for example various schemes to inject and store CO2 in subsurface geological
formations, such as depleted reservoirs and deep saline aquifers. One well cited
requirement is to conserve the mass globally and locally, but most popular
methods of N-phase flow used in practice conserve mass only for… More >
Open Access
ABSTRACT
Motoharu Fujigaki1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 26-26, 2021, DOI:10.32604/icces.2021.08385
Abstract Several types of accurate and high-speed 3D shape measurement using
linear LED devices were developed by author's research group. The linear LED
device is a key device to develop them. High-speed phase shift synchronized with
camera triggers can be achieved by switching the lighting position of the linear
LED. The control signals can be generated easily with a no special micro-computer.
A compact projector unit can be produced. Author also proposed a calibration
method, named a whole-space tabulation method (WSTM), for an accurate and
high-speed shape measurement using multiple reference planes. A handy, fullcolor and real-time 3D shape measurement unit… More >
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