Home / Journals / ICCES / Vol.21, No.1, 2019
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  • Open Access

    ABSTRACT

    Fracture Dynamics-A Photomechanics Investigation

    Albert S. Kobayashi
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 1-1, 2019, DOI:10.32604/icces.2019.04561
    Abstract This presentation will summarize the author’s studies on dynamic fracture based on photomechanics. During the early stage of our studies, dynamic photoelasticity was used to record dynamic crack propagation/arrest and crack branching in Homalite-100 fracture specimens. Dynamic crack arrest was found to be a constant but significantly higher than the ring down static arrest stress intensity factor which varies with the crack initiation condition. A crack branching criterion based on a critical stress intensity factor was also established. Moiré interferometry together with high-speed photography and the generation phase of dynamic finite element analysis were then used to determine the dynamic… More >

  • Open Access

    ABSTRACT

    Small Vibration Measurement of Plant Equipment Using Sampling Moire Camera

    Motoharu Fujigaki*, Tomoaki Nakajima
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 2-2, 2019, DOI:10.32604/icces.2019.05156
    Abstract A sampling moire camera was developed by authors to measure the displacement of large structures effectively. The sampling moire camera was applied to small vibration measurement of a plant equipment in this paper. An algorithm of a sampling moire method is assembled into the sampling moire camera. It is very convenient to use the sampling moire camera in a practical field outdoors because any calibration is not necessary. This camera can measure the 2-D displacement in real-time. An experiment to measure small vibration of a moving conveyor belt to carry materials in a steel plant was performed. A frequency analysis… More >

  • Open Access

    ABSTRACT

    Investigation on 3-D Deformation of Granular Materials under Compression Using Electronic Speckle Pattern Interferometry

    Fujun Yang*, Lingpeng Zhang, Yinhang Ma, Hanyang Jiang, Xiaoyun He
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 3-3, 2019, DOI:10.32604/icces.2019.05395
    Abstract Granular materials such as soil and sand are ubiquitous. Particle size and shape of granular materials has great influence on their mechanical behavior, such as compressibility, yield strength and permeability. In this research, uniaxial compression experiment is carried out on sands, to study deformation evolution and force transmission of granular materials, by using electronic speckle pattern interferometry (ESPI). The testing sample is the dense mixture of different size sand particles. Three dimensional (3-D) displacement information is obtained by the 3-CCD color camera and phase-shifting method. Three different color laser lights (in Red, Green and Blue) and only one PZT transducer… More >

  • Open Access

    ABSTRACT

    Fringe Pattern Analysis: Some Results and Discussions (III)

    Kemao Qian
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 4-4, 2019, DOI:10.32604/icces.2019.05557
    Abstract Fringe-based measurement techniques provide an accurate, straightforward and convenient means for optical metrology and experimental mechanics [1]. Consequently, fringe pattern analysis is an important issue. We have reported our works in this conference in 2011 [2] and 2014 [3]. In this paper, our recent developments since 2014 are introduced, as listed below:
    1. Among various fringe patterns, carrier fringe is more convenient to use but more difficult to characterize. We unified several prominent carrier fringe analysis techniques for deeper understanding. The background removal and the influence of high-order harmonics are also studied.
    2. Moving fringe analysis techniques from methodology to… More >

  • Open Access

    ABSTRACT

    An Experimental Study on Properties of High-Volume Slag and Fly Ash Cements Incorporating Calcined Oyster Shells Waste

    Ali Naqi, Jeong Gook Jang*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 5-5, 2019, DOI:10.32604/icces.2019.05299
    Abstract Concrete construction industry is facing a sustainability issue for a variety of reasons. First, it consumes enormous amounts of natural resources. Second, the primary content in the binder of concrete is Portland cement, which production is one of the major sources of greenhouse gas emissions leading to global warming. Third, durability concerns of concrete structures. To overcome these issues cement is substituted with high volumes of more sustainable cementitious materials such as slag and fly ash. Slag is a by-product of an iron blast furnace while fly ash is a by-product of coal-fired power plants. Both these supplementary cementitious materials… More >

  • Open Access

    ABSTRACT

    Numerical Investigation of Floor Response Spectrum Considering Nonlinear Behavior of Shear Walls in Nuclear Power Plants

    Hyung-Jo Jung, Heekun Ju
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 6-6, 2019, DOI:10.32604/icces.2019.05761
    Abstract The floor response spectrum (FRS) of a nuclear power plant (NPP) structure considering nonlinear behavior of shear walls is numerically investigated. The Hysteretic Material from OpenSees program is applied to a lumped-mass model to consider the nonlinear hysteretic behavior of the element representing the shear wall. Parameters that determine the hysteretic behavior are changed to examine the effects of the parameters on the resulting FRS. The pinching effect, damage due to ductility and energy, and degraded unloading stiffness can be considered with changes in parameter values. The hysteretic behavior of the structure with different parameter values was analyzed. Elements in… More >

  • Open Access

    ABSTRACT

    Probabilistic Floor Response Spectrum of Nonlinear Nuclear Power Plant Structure using Latin Hypercube Sampling Method

    Heekun Ju, Hyung-Jo Jung*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 7-7, 2019, DOI:10.32604/icces.2019.05846
    Abstract Latin hypercube sampling (LHS) is widely applied to estimate a probabilistic floor response spectrum (FRS) of nonlinear nuclear power plant (NPP) structure. ASCE 4-16 Standards recommend that the minimum number of simulations should be larger than 30 when using LHS. Although this recommendation is commonly used for the minimum number of the simulation, there is no theoretical background. The variability of the estimations may exist according to the number of the simulation. Stated differently, the minimum number of the simulation may be varied depending on the characteristics of the problem (i.e., problem-dependent). In this context, the required sample size of… More >

  • Open Access

    ABSTRACT

    Modelling of Progressive Failures in Quasi-Brittle Media Via a Temporal Stress-Redistribution Mechanism

    Jinxing Liu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 8-8, 2019, DOI:10.32604/icces.2019.04952
    Abstract A new method is proposed to simulate progressive failure processes in heterogeneous brittle materials such as concrete, ceramics, rocks etc., by considering the time-dependence of stress redistributions induced by local breakages. Two mechanisms of stress redistribution are incorporated into the proposed model in order to account for the influence of each local breakage on the remaining specimen: (1) One is the immediate release of internal forces in the breaking element, which is assumed to happen within an infinitesimal time when compared with the characteristic time of external loadings. The release of such internal forces is hence suddenly applied to the… More >

  • Open Access

    ABSTRACT

    Cohesive Zones and Interactions of Mixed-Mode Interface and Matrix Cracks

    J. Scheel, A. Ricoeur
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 9-9, 2019, DOI:10.32604/icces.2019.05030
    Abstract The heterogeneous state of stress in composite materials and the possible damage in interfaces, lead to a complicated problem concerning matrix crack tip loading analysis and crack path prediction. A powerful and accurate tool for calculating crack tip loadings is the J-integral, which was independently introduced by Rice and Cherepanov. The calculation of crack deflection angles using the J-integral criterion is enabled by the J-integral vector formulation, whereupon the calculation of matrix crack tip loadings and also interface crack tip loadings is possible. The J-integral and the crack tip opening displacement, as crack tip loading quantity of cohesive zone models,… More >

  • Open Access

    ABSTRACT

    Three-Dimensional J-Integral Based on a Domain Integral Method for Non-Homogeneous Solid with Residual Stresses Undergoing Large Deformation

    Hiroshi Okada*, Tatsuro Ishizaka, Akira Takahashi, Koichiro Arai, Yasunori Yusa
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 10-11, 2019, DOI:10.32604/icces.2019.05037
    Abstract In this paper, a new three-dimensional J-integral for non-homogeneous solids undergoing large deformation and associated with residual stresses is presented. The formulation of J-integral involves the strain energy density W that is generally defined by the integral W = ∫0t τijε·ijdt over the entire deformation history of a material point where tij and ε·ij are the components of the Kirchhoff stress and those of velocity strain. t and t represents the time. It is assumed that at t = 0 the body is free from any deformation and therefore the stresses are zeros.
    Residual stresses are… More >

  • Open Access

    ABSTRACT

    Configurational Forces in Three-Dimensional Crack Loading Analyses and Crack Growth Simulations

    Kevin Schmitz1,*, Paul Judt1, Andreas Ricoeur1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 12-12, 2019, DOI:10.32604/icces.2019.05164
    Abstract In order to evaluate cracks in three-dimensional (3D) specimens, it is necessary to perform crack loading analyses. Loading quantities are calculated, employing the distribution of stress and strain in the vicinity of the crack front. In thin planar structures with plane mode I/II loading, analyses at simplified two-dimensional boundary value problems provide sufficiently accurate loading quantities. However, for an increasing thickness or presence of mode III loading, the plane assumptions in general lose their validity. Three-dimensional structures exhibit spatial stresses, leading to a non-constant stress distribution along the crack front and to non-uniform crack front loading, respectively. As a result,… More >

  • Open Access

    ABSTRACT

    SMA Confinement of HDPE Pipes: Enhancement of the Joint Fracture Resistance

    Eunsoo Choi1,*, Yunkyu Ha1, Duhyeon Kim1, Hoan D. Nguyen1, Tae Yeong Kim1, Seong Jun Park1, Yeon-seong Lee1, Cheolki Min2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 13-13, 2019, DOI:10.32604/icces.2019.05356
    Abstract This study was to provide a new aspect of application of shape memory alloys (SMAs) in civil engineering. The high-density polyethylene (HDPE) have been used for construction of pipelines for several years. The main problem of using HDPE for pipes is the joint of two adjacent pipes. In case of having a perfect joint, the HDPE pipeline can bare the internal pressure up to 90 MPa. However, in practice, it can rarely achieve to a perfect pipe joint due to the complicated process, so, it prone to fracture in low internal pressure. To overcome this, this study investigated the efficiency… More >

  • Open Access

    ABSTRACT

    Numerical Prediction of Penetration Shape in Metal Active Gas Welded Joints of Steel Plates

    Hisashi Serizawa1, Shingo Sato2, Fumikazu Miyasaka2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 14-14, 2019, DOI:10.32604/icces.2019.05606
    Abstract It is important to predict the penetration shape of welded joints because the penetration shape strongly affects the strength of joints. As one of the methods for simulating gas metal arc welding (GMAW) process, a three-dimensional, non-stationary thermal model has been developed. By using a finite differential model based on the heat flow equation and taking account of the balance of gravity, surface tension and arc pressure, both molten pool and the penetration shape are successively demonstrated. Although the finger type penetration which is generally observed in metal insert gas (MIG) welding of aluminum alloy can reproduced by developing an… More >

  • Open Access

    ABSTRACT

    Residual Stress and Effect on Crack Growth and Fracture in Weldments

    F. W. (Bud) Brust
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 15-15, 2019, DOI:10.32604/icces.2019.05802
    Abstract This paper will begin with an overview of computational weld modeling procedures. This will include discussion of current weld modeling procedures of theory, practice, and validation of the modeling approaches that are popular today. This will include a very brief discussion of additive manufacturing modeling approaches. Next methods of residual stress and distortion control procedures will be summarized. More >

  • Open Access

    ABSTRACT

    J-Integral Evaluation of Cracked Shell Structures Employing Effective Reproducing Kernel Meshfree Modeling

    M. J. Dai, S. Tanaka*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 16-16, 2019, DOI:10.32604/icces.2019.05895
    Abstract The J-integral evaluation are analyzed employing effective reproducing kernel method. Several numerical examples of cracked shell structure are carried out to investigate the mixed-mode stress resultant intensity factors (SRIFs). It is formulated by the first order shear deformation plate theory. Reproducing kernel (RK) is used to the meshfree interpolant. A diffraction method, visibility criterion and enriched basis are introduced to model the through crack. J-integral is evaluated based on the stress resultants and is decomposed into the symmetric and asymmetric parts for extracting the mixed-mode SRIFs. The stabilized conforming nodal integration (SCNI) and sub-domain stabilized conforming nodal integration (SSCI) are… More >

  • Open Access

    ABSTRACT

    Evaluation of Dynamic Stress Intensity Factors Using Varying Horizon Size in Ordinary State-Based Peridynamics

    M. Imachi, S. Tanaka*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 17-17, 2019, DOI:10.32604/icces.2019.05896
    Abstract The J-integral and the interaction integral method are employing for evaluating dynamics stress intensity factor, in ordinary state-based peridynamics. The governing equation of peridynamics is based on internal force that defined by particles interact each other over finite distances. The interaction each particle needs to be satisfied the newton third law. A lot of particles are required for getting high accuracy in peridynamic modeling. Therefore, it is required the efficient modeling such as local meshing in finite element modeling. However, when arrangement of particle with varying particle size and horizon sizes are locally used, the standard peridynamic equation is not… More >

  • Open Access

    ABSTRACT

    Implementation of Micro Encapsulated Phase Change Material (MEPCM) Into Fluid Based Heat Exchangers

    Robert Plant*, M. Ziad Saghir
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 18-18, 2019, DOI:10.32604/icces.2019.04980
    Abstract Fluids have been used to maintain operational temperatures for machinery for as long as machines have been developed. Over time different mediums have been explored, such as oils and waxes. These different mediums have had varying impacts on the overall system such as improving the heat capacity but at the cost and strain on the system of requiring more pumping power. Some mediums, while they provide an improvement can also damage to the system itself over time with unwanted interactions such corrosion. In this paper we will examine the implementation and suspension into the working fluid of Micro Encapsulated Phase… More >

  • Open Access

    ABSTRACT

    Analysis on the Thermal Performance of Nanofluids As Working Fluid With Porous Heat Sinks: Applications in Electronics Cooling

    Ziad Saghir, Cayley Delisle, Christopher Welsford*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 19-19, 2019, DOI:10.32604/icces.2019.05145
    Abstract The enhancement of consumer and industrial electronics has led to an increase in both the power and compactness of the products available. However, with these increases follows a subsequent increase in the thermal losses experienced across, for example, a central processing unit (CPU). As well, the need to dissipate waste thermal energy is compounded by the increased compactness. As the chipsets become smaller, the threads contained therein also reduce in size and as such become more sensitive to temperature gradients which can cause deformation. Although this deformation is miniscule, its continuous repetition can ultimately result in a thermally induced fatigue… More >

  • Open Access

    ABSTRACT

    Experimental Study on the Thermal Performance of a PCM Panel with Mach-Zehnder Interferometry

    Fabio Almeida1,*, Wey H. Leong2, Alan S. Fung2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 20-20, 2019, DOI:10.32604/icces.2019.05573
    Abstract An experimental study was performed to measure the convective heat transfer and thermal decay of a vertical PCM (Phase Change Material) panel. The PCM (soy wax) was enclosed in a thin acrylic shell with an insulated perimeter. The panel was heated to 70°C and allowed to cool by natural convection to room temperature. The experiment captured the transient thermal behaviour of the panel in free convection during liquid and solid phases, and during phase change. Near temperature field visualization and convective heat transfer measurements were obtained using Mach Zehnder Interferometry at one-minute intervals. Finite fringe interferograms were used to obtain… More >

  • Open Access

    ABSTRACT

    Numerical and Experimental Investigation of Heterogeneous Transformation Behaviour in Shape Memory Alloys

    Bashir S. Shariat*, Sam Bakhtiari, Hong Yang, Yinong Liu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 21-21, 2019, DOI:10.32604/icces.2019.05559
    Abstract Shape memory alloys (SMAs) are a unique collection of materials which can return to their initial configuration after being largely deformed. Near-equiatomic NiTi is the most widely used SMA due to its excellent shape memory properties and fabricability. One exceptional property of this alloy is superelasticity, which refers to the ability of the alloy to accommodate relatively large deformation typically up to 8% of tensile strain and return to the original undeformed shape upon unloading. As a result of this outstanding feature, superelastic NiTi have been increasingly used in different areas of engineering, such as in biomedical engineering and in… More >

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