Open Access
ABSTRACT
Quan Zheng, Jing Wang, Jing-ya Li
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 101-102, 2011, DOI:10.3970/icces.2011.017.101
Abstract This paper investigates the coupling method of the finite element and the natural boundary element using an elliptic artificial boundary for solving exterior anisotropic problems, and obtains new error estimate that depends on the mesh size, the location of the elliptic artificial boundary, the number of terms after truncating from the infinite series in the integral. Numerical examples are presented to demonstrate the effectiveness and accuracy of this method. More >
Open Access
ABSTRACT
N. Yan, N. Kawagoishi, Y. Maeda, Q. Chen
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 103-104, 2011, DOI:10.3970/icces.2011.017.103
Abstract Fatigue tests under rotating bending and ultrasonic loading were carried out using plain specimens with different grain sizes of Ni-base super alloy, Inconel 718, in order to investigate the effects of grain size and loading frequency on fatigue properties. Fatigue strength was increased with decreasing in grain size under both tests. Moreover, the fatigue strength under ultrasonic loading was higher than that under rotating bending. The resistance to crack initiation was larger in smaller grain sized alloy under both tests, and larger under ultrasonic loading than under rotating bending. Effects of loading frequency and grain size on crack initiation were… More >
Open Access
ABSTRACT
K. Kakuda, J. Toyotani, S. Matsuda, H. Tanaka, K. Katagiri
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 105-106, 2011, DOI:10.3970/icces.2011.017.105
Abstract The application of a particle method to incompressible viscous fluid flow problems is presented. The method is based on the MPS (Moving Particle Semi-implicit) scheme using logarithmic weighting function. Numerical results demonstrate the workability and the validity of the present approach through incompressible viscous fluid flow in a driven cavity and flow behavior in a liquid ring pump with rotating impeller blades. More >
Open Access
ABSTRACT
Dongdong Wang, Zhuoya Li, Youcai Wu
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 107-108, 2011, DOI:10.3970/icces.2011.017.107
Abstract Meshfree methods have experienced substantially fundamental development and various applications. One distinguished advantage for meshfree methods is that they can relieve the mesh tangling burden of FEM and are more suitable for finite deformation analysis. In this work a three dimensional updated Lagrangian Galerkin meshfree formulation with improved computational efficiency is presented to analyze the failure of soil slopes. This nonlinear meshfree formulation is featured by the Lagrangian stabilized conforming nodal integration method where the low cost nature of nodal integration approach is kept and at the same time the numerical stability is obtained as is not the case for… More >
Open Access
ABSTRACT
Pei-Lum Tso, Wei-Shiang Wang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 109-110, 2011, DOI:10.3970/icces.2011.017.109
Abstract Different stamping tasks require different punch motions and always require different press machine. This paper uses a novel computer-aided design approach to study the role of ternary link (members with three revolute joints) in the Stephenson III six-bar mechanical press and its relationship with the punch motions. Based on the theory of three precision positions function and path generation synthesis for four-bar mechanism, a computer program have been developed to find the acceptable ternary link lengths according to the given ram displacement diagrams. The results show that to change the dimension of the ternary link can get various punch motions… More >
Open Access
ABSTRACT
Zeng Xiangfu, Ma Shaopeng, Ma Qinwei, Chen Pengwan
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 111-112, 2011, DOI:10.3970/icces.2011.017.111
Abstract In order to measure the attitude parameters of the projectile, a high-speed 3-dimensional digital image correlation (H3D-DIC) system is designed and constructed. In the H3D-DIC system, two high-speed cameras are used to capture the images of the projectile from two different directions and the 3-dimensional coordinates of the markers painted on projectile are obtained by processing the images using stereovision techniques. Because of the difference on the resolution of the two cameras, the images captured are with different magnification. Therefore, a new correlation program, in which the parameter of pixel size is also included in the correlation schedule, is designed… More >
Open Access
ABSTRACT
Zhao Zilong, Ma Shaopeng, Wang Xian
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 113-114, 2011, DOI:10.3970/icces.2011.017.113
Abstract As one of the most important photomechanics experimental methods, digital image correlation (DIC) has been widely used in various areas for displacement and deformation field measurement. The main idea of DIC is to resolve the displacement of speckle patterns by independently matching the corresponding patterns on reference and deformed speckle images. In order to add the continuity between the matching of the adjacent patterns, the mesh based DIC (abbreviated mesh-DIC hereafter), in which the whole image are matched, is proposed by Sun, et al. In mesh-DIC, the whole displacement field is characterized by a mesh which is constructed by 4-node… More >
Open Access
ABSTRACT
Guo Baoqiao, Chen Pengwan, Zhang Qingming, Li Yanjie, Xie Huimin
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 115-116, 2011, DOI:10.3970/icces.2011.017.115
Abstract Optical full-field measurement methods are now widely applied in various domains. In general, the displacement fields can be directly obtained from the measurement; however in mechanical analysis strain fields are preferred. To extract strain fields from noisy displacement fields is always a challenging topic. In this study, a finite element method for smoothing displacement fields and calculating strain fields is proposed. An experimental test case on a holed aluminum specimen under tension is applied to validate this method. The heterogeneous displacement fields of the area around the hole are measured by the digital image correlation (DIC). By our proposed method,… More >
Open Access
ABSTRACT
Shang Yang, Sun Xiangyi, Yang Xia, Wang Xi, Yu Qifeng
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 117-118, 2011, DOI:10.3970/icces.2011.017.117
Abstract A new method of camera calibration is presented for exact videometrics in large field. The camera to be calibrated and the control points used in the new method are both close to the ground. In the condition that the control points and the camera are approximately coplanar, the main point position, focus length, lens distortion coefficients and the camera's position and attitude parameters are calibrated precisely by the method. Two calibration images are taken by the camera to be calibrated in measurement state and vertical rotation state respectively. If the vertical tangent lens distortion can be neglected or the movement… More >
Open Access
ABSTRACT
Jianyong Huang, Xiaoling Peng, Chunyang Xiong, Jing Fang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 119-120, 2011, DOI:10.3970/icces.2011.017.119
Abstract Cell-substrate interfacial interplay plays a key role in many fundamental aspects of mammalian physiology. Recent progresses in related experiments concerning cell interactions with extracellular matrix have demonstrated that substrate rigidities can exert a remarkable influence on cell adhesion and spreading dynamics. For example, it has been reported that cell-substrate adhesion strength usually rises monotonically with Young's modulus of underlying elastic substrates and eventually achieves the strongest adhesion on rigid substrates such as glass, and that cell spreading area takes on a growing trend with the increase in substrate hardness and finally reaches a plateau when the stiffness exceeds the order… More >
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