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 >

Eunsoo Choi^1,*, 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 >

Kevin Schmitz^1,*, 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 >

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 = ∫₀^t τ_ijε^·_ijdt⁻ over the entire deformation history of a material point where t_ij 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 >

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 >

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 >

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 >

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 >

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 >

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 >