Open Access
ABSTRACT
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
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
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
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
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
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
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
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
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
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 >
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