Journals / ICCES / Vol.22, No.4
Table of Content

  • ABSTRACT

    A Paris Law-Based Cohesive Zone Model for Fatigue Crack Growth Simulations

    Akiyuki Takahashi1,*, Takaki Fujiwara1, Yuichi Shintaku2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 170-170, 2019, DOI:10.32604/icces.2019.05151
    Abstract This paper presents a Paris law-based cohesive zone model (CZM) for fatigue crack growth simulations to enable the consideration of the plasticity induced crack closure effect, which is known to be a source of substantial crack growth retardation. In order to avoid the addition of any redundant model parameters, the basic equation of the CZM is derived from the Paris law so that the CZM has only the parameters of Paris law. Thus, the parameters can be determined by referring the existing experimental data of the Paris law without any troublesome fitting processes. Only the parameter to be fitted is… More >

  • ABSTRACT

    Design and Manufacturing of Composite Materials using 3D Printer

    Ryosuke Matsuzaki1,*, Taishi Nakamura1, Yusuke Yamagata1, Akira Todoroki2, Masahito Ueda3, Yoshiyasu Hirano4
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 171-171, 2019, DOI:10.32604/icces.2019.05205
    Abstract When continuous carbon fiber composites are molded with a 3D printer, three-dimensional complex structure can be integrally molded, which leads to reduction of manufacturing time and cost. In addition, because the curved continuous fibers can be printed in a plane when the 3D printer is utilized, the design space and capability of 3D printed composites will drastically expand compared with using just straight fibers such as conventional prepreg. However, printing accuracy of composite materials may be affected uniquely by parameters such as number of fibers in tow, printing curvature, compaction pressure etc. In this study, we investigated to construct an… More >

  • ABSTRACT

    DIC Measurement of Deformation in Cracked CFRP Cross-Ply Laminates

    M. J. Mohammad Fikry1,*,Shinji Ogihara1, Vladimir Vinogradov2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 172-172, 2019, DOI:10.32604/icces.2019.5210
    Abstract Digital Image Correlation (DIC) is a new non-contact method to analyze the deformation of materials that can measure displacement or strain behavior during tensile loading. In this study, DIC is used to measure the deformation of cross-ply Carbon Fibre Reinforced Plastics (CFRP) laminates and for the detection of damages in them. The objective of this study is to measure the deformation around the damages in cross-ply CFRP laminates by using the DIC system from both width and thickness directions. For this purpose, thick CFRP [04/9024]s and thinner [0/906]s laminates were tested. In cross-ply laminates, usually a straight transverse crack will… More >

  • ABSTRACT

    A Directional Method of Particular Solution for Solving the 3D Poisson Equation

    Chunglun Kuo*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 173-173, 2019, DOI:10.32604/icces.2019.05272
    Abstract In this article, a directional method of particular solution (DMPS) is derived to solve the 3D Poisson equation in an arbitrary domain. The proposed DMPS for the 3D problems are based on the 2D particular solution. Together with the directional technique we can construct the 3D particular solution easily by introducing a series of planar directors into the 2D particular solution. The intensities of the basis functions are determined by imposing the boundary condition on the boundary collocation points. Besides, the inverse Cauchy problems are also addressed in this article. The inverse problems are highly ill-posed in nature. In order… More >

  • ABSTRACT

    New Approach of Characteristic Tensor to Mixed Mode Crack Propagation

    Kei Saito1,*, Tei Hirashima1, Ninshu Ma2, Hidekazu Murakawa2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 174-174, 2019, DOI:10.32604/icces.2019.05406
    Abstract Characteristic tensor is a tensor which is derived from the characteristic stress field near to a crack tip and is strongly related to fracture mechanics parameters in principle. Each component of characteristic tensor consists of an invariant quantity which defines intensity of stress singularity, corresponding to the stress component. Since it contains the information about not only intensity but also direction of the singularity, characteristic tensor can be a possible candidate which evaluates characteristics of cracking and its propagation direction under various complex loading conditions we have to assume for the practical analysis. Though parameters based on fracture mechanics have… More >

  • ABSTRACT

    Ultra Large-Scale Nonlinear FE Analysis of Welding Mechanics

    Kazuki Ikushima1,*, Shintaro Maeda2, Masakazu Shibahara1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 175-175, 2019, DOI:10.32604/icces.2019.05542
    Abstract Large-scale thin-plate structures including ships are constructed by welding, and distortion can occur after welding. Welding deformation can increase cost and work time, and so it is important to investigate welding deformation before construction. In this research, to predict welding deformation on the construction of a large thin-plate structure, Idealized Explicit FEM (IEFEM) was applied to the analysis of welding deformation on the construction of a ship hull block. In addition, to efficiently analyze deformation of the whole structure of a large-scale structure, an algebraic multigrid (AMG) method was introduced into the IEFEM. Then, this multigrid IEFEM (MGIEFEM) was applied… More >

  • ABSTRACT

    Analysis of Fatigue Crack Propagation on Orthotropic Bridge Deck Based on Extended Finite Element Method

    Ying Wang*, Zhen Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 176-176, 2019, DOI:10.32604/icces.2019.05665
    Abstract Due to stress concentration as well as welding residual stress, fracture due to vehicle fatigue loads is easy to occur in the weld and its adjacent position of long-span bridge, especially at the toe of weld between the U-rib and orthotropic steel bridge deck. In order to investigate the fatigue crack propagation mechanism of the toe of weld in long-span bridge, a multi-scale finite element model including the whole bridge, local components, the welding details and cracks was established firstly. And then, based on birth and death element technology, the welding heat and structural coupling process simulation was carried out… More >

  • ABSTRACT

    A Novel Boundary-Type Meshless Method for Solving the Modified Helmholtz Equation

    Jingen Xiao1,*, Chengyu Ku1,2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 177-177, 2019, DOI:10.32604/icces.2019.05068
    Abstract This paper presents a novel boundary-type meshless method for solving the two-dimensional modified Helmholtz equation in multiply connected regions. Numerical approximation is obtained by the superposition principle of the non-singular basis functions satisfied the governing equation. The advantage of the proposed method is that the locations of the source points are not sensitive to the results. The novel concept may resolve the major issue for the method of fundamental solutions (MFS). In contrast to the collocation Trefftz method (CTM), the Trefftz order of the non-singular basis functions can be reduced since the multiple source points are adopted. To solve the… More >

  • ABSTRACT

    Dynamic Green’s Functions for Multiple Elliptical Inclusions With Imperfect Interfaces Using the Collocation Multipole Method

    Weiming Lee
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 178-178, 2019, DOI:10.32604/icces.2019.05190
    Abstract This paper presents a semi-analytical approach to solve anti-plane dynamic Green’s functions for an elastic infinitely extended isotropic solid (matrix) containing multiple elliptical inclusions with imperfect interfaces. The multipole expansions of anti-plane displacement for the matrix and inclusion are formulated in terms of angular and radial Mathieu functions to solve the dynamic Green’s functions. Instead of using the complex addition theorem, frequently used in the traditional multipole method for a multiply-connected domain problem, the multipole expansion is directly computed in each local elliptical coordinate system. A linear spring model with vanishing thickness is employed to character the imperfect interface. The… More >

  • ABSTRACT

    A Reduced Order Model for the Fast Predictions of Reactivity and Neutron Distributions within Reactor Cores

    Andrew Buchan1, Simon Jewer2, Ionel Michael Navon3
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 179-179, 2019, DOI:10.32604/icces.2019.05396
    Abstract A new Reduced Order Model (ROM) is developed for solving the neutron eigenvalue problem for the fast and accurate prediction and simulation of the neutron flux within light water reactor cores. The method of Proper Orthogonal Decomposition is employed to form the ROM which uses snapshots obtained from a full order model based on the finite element discretisation of the spatial dependence of the multi-group neutron diffusion equation. We detail how the temperature variation and control rod adjustments can be efficiently integrated into the model and their influence then accurately predicted within the model's solution. This is particularly important as… More >

  • ABSTRACT

    Computational Modelling of Thermoelectricity, Carrier Mobility and Electro-Catalytic Oxygen Reduction Reaction: a Few Examples

    Swapan K Pati
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 180-180, 2019, DOI:10.32604/icces.2019.05545
    Abstract In recent years, many van der Waals solids, perovskites, spinels etc. exhibit many fold benefits for applications in a number of fields, namely, transparent substrates, field effect transistors, solar cells, thermoelectric materials, active surface for catalysis, rechargeable battery etc, to name a few. In fact, recent experimental advancements on the control over the surface structure of materials has enabled material scientists to tailor the material properties with improved reliability and functionality. We have derived relaxation time formulation from complete Boltzmann transport equation and obtained all the parameters from ab-initio density functional theory. Using this formalism, we have calculated charge carrier… More >

  • ABSTRACT

    Damage Modeling of Heterogeneous Materials Using Multiscale Approach

    Jurica Sorić*, Tomislav Lesičar, Filip Putar, Zdenko Tonković
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 181-183, 2019, DOI:10.32604/icces.2019.04554
    Abstract The paper deals with the novel multiscale approaches for modelling of both quasi-brittle and ductile damage responses of heterogeneous materials. The damage is induced at the microstructural level and, after the homogenization procedure, it is included in the constitutive stiffness of the material point at macrolevel. The derived algorithms are implemented into the finite element software ABAQUS. The new two-scale transition procedures have been verified on the standard benchmark examples. More >

  • ABSTRACT

    Three-Dimensional Fracture Mechanics: Bridge the Gap from Laboratory to Engineering Structures

    Wanlin Guo
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 184-186, 2019, DOI:10.32604/icces.2019.04905
    Abstract The fracture mechanics theories have been developed actively for several decades, and have been successful for many specific engineering applications and serves as the fundamental for damage tolerant design of structures. In 1957, William and Irwin obtained the stress intensity factor K dominated solution of the singular stress and strain fields near crack tip in linear elastic plate, provided the theoretical basis for linear elastic fracture mechanics. In 1968, the famous J-integral dominated HRR solution for plane stress and plane strain cracked plates of power law hardening materials has long served as the fundamental of elastic-plastic fracture mechanics and similar… More >

  • ABSTRACT

    A Simple Method for Simulation of Crack Growth in Welded Structures

    Hidekazu Murakawa
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 187-187, 2019, DOI:10.32604/icces.2019.05179
    Abstract It is known that fatigue life of welded structures, such as ships and bridges, is greatly influenced by welding residual stress. In case of real structures, the orientation of the stresses produced by dead load and that produced by applied load and that of welding residual stress are generally different from each other and they form a highly complex multiaxial stress states. On the other hand, the fatigue behavior has been mostly studied for uniaxial stress state without residual stress. The crack growth rate is related to the Range of stress intensity factor ΔK such as in the Paris’ Low.… More >

  • ABSTRACT

    Meshless Methods in Computational Biomechanics for Medicine

    Karol Miller
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 188-188, 2019, DOI:10.32604/icces.2019.06116
    Abstract The field of Biomechanics is in the most exiting state of transition from the theoretical subject of the 20th century to a practical discipline providing patient-specific solutions in the 21st century. Computational biomechanics is becoming instrumental in enabling a new era of personalized medicine based on patient-specific scientific computations. The Finite Element Method is used by almost all members of computational biomechanics community to analyze mathematical models described by sets of partial differential equations. FEM, however, has a number of fairly serious theoretical and practical deficiencies when applied to highly deformable objects of very complicated shapes, such as human soft… More >

  • ABSTRACT

    The Progress of Energy Meshless Methods by Using Trial Functions as the Bases of Solution

    Cheinshan Liu1,2,3, Chunglun Kuo2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 189-191, 2019, DOI:10.32604/icces.2019.05074
    Abstract For the linear differential operator equation equipped with boundary conditions we derive an energy identity. Then we propose an energy regularization technique to choose the energetic bases in the numerical solution of linear differential operator equation. In many meshless methods with some trial functions as the bases of numerical solution, there exist certain parameters in the numerical method. We derive a very simple energy gap functional and minimize it to determine the optimal parameters. The new methodology upon adopting optimal parameters by minimizing the energy gap functional can improve the accuracy of the meshless methods in the numerical solutions. More >

  • ABSTRACT

    Mathematical Foundation of the Collocation Boundary Element Method: Consistent Formulation, Convergence Theorem and Accurate Numerical Quadrature

    Ney Augusto Dumont
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 192-192, 2019, DOI:10.32604/icces.2019.05284
    Abstract The use of boundary integral equations as an attempt to solve general problems of elasticity and potential has largely preceded the use of domain-related developments, which only became feasible (and conceivable) with the advent of powerful computational devices. On the other hand, the present-day matrix, computational-ready outline of the boundary element method (including its nowadays prevalent name) has borrowed – in part correctly and in part wrongly – much from the finite element concepts and formulation. We propose a revisit of the method, including, as for elasticity problems: a) conceptual reformulation in terms of weighted residuals with a consistent derivation… More >

  • ABSTRACT

    Applications of Computational Mechanics on Advanced Film-Type Nano/Micro Structures

    Chang-Chun Lee
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 193-193, 2019, DOI:10.32604/icces.2019.05407
    Abstract Over the past half-century, the pivotal concepts and theories of solid mechanics was maturely developed to describe the mechanical responses of meso-scaled structure. From the viewpoint of traditional solid mechanics, the major concerns of developed analytic solutions were to investigate the mechanical responses of bulk-scaled material. However, the abundance of novel nano/micro process and corresponding material structures with unique mechanical behavior revealed that the limitation of traditional solid mechanics. For this reason, this research is mainly devoted to review the application of computational mechanics on nano/micro structures. As a result of this review paper, application of different computational methods is… More >

  • ABSTRACT

    Raindrops and Turbulence in a Cloud

    Rama Govindarajan1, S. Ravichandran2, Jason Picardo1, Samriddhi Sankar Ray1, S. Ganga Prasath1, Vishal Vasan1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 194-194, 2019, DOI:10.32604/icces.2019.05206
    Abstract A cloud is in turbulent motion. It contains water vapour, aerosol particles and liquid water droplets. Depending on local levels of supersaturation, condensation takes place onto the aerosol particles and tiny droplets are formed. Our studies are aimed at understanding how these droplets grow in a short time, thought to be of the order of ten minutes, from about a micron in size into raindrops, which are of the order of millimeters. An important part of the process is collisions between droplets, some of which results in coalescence. Caustics from a single vortex are shown to be important for enhancing… More >

  • ABSTRACT

    Research on Artificial Intelligence Method for Identification of Transformer Fault

    Ryuji Shioya and Hongjie Zheng
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 195-195, 2019, DOI:10.32604/icces.2019.05008
    Abstract Oil-filled power transformers play an important role in the modern network system. Stability of power supply can be achieved by early detection of power transformer fault and continuous monitoring of equipment status. Transformers in operation are constantly affected by various types of stresses such as electrical, thermal and mechanical stress. Much attention is needed on maintenance of transformers in order to have fault free electric supply and to maximize the lifetime of a transformer. In recent years, Dissolved gas analysis (DGA) has been widely used for diagnostic fault of power transformers. Although DGA is an easier and simpler method for… More >

  • ABSTRACT

    Control of a Diffusion Flame By Polygonal Orifices and External Modulation

    Artur Tyliszczak*, Agnieszka Wawrzak
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 196-199, 2019, DOI:10.32604/icces.2019.05081
    Abstract Efficiency of combustion processes is related to fuel-oxidizer mixing and interactions between a flame and a flow field. Their control can be achieved by passive and/or active techniques and may lead to considerable improvement in performance of various technological devices. Passive control involves manipulation of the flow by changing shape of the flow domains. Active control relies on manipulation of a flow field by an external forcing. The present study aims to give a deeper insight into the applicability of passive devices combined with active control strategy for mixing enhancement in jet type flames. We apply the passive control approach… More >

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