Open Access
ABSTRACT
C.T. Kwan, C.C. Wang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 1-2, 2011, DOI:10.3970/icces.2011.018.001
Abstract In this paper, a pre-stress die design method for cold backward extrusion with a non simple hollow cylinder die by using response surface method is proposed. The radius of the interface and the absolute interference in the interface of a prestress die are chosen as the design variables. Both the two design variables are set at four levels, and then 16 combinations of design parameters are constituted totally. A finite element based code is utilized to investigate the elastic deformation characteristic under different design parameters, and the response surface method is then employed to synthesize the data sets obtained from… More >
Open Access
ABSTRACT
L. J. Qin1, X.F. Li1, X.G. Yang2, Z.W. Zhang2, Z. H. Feng2, H. Miao1, Y. Wang1, L.H. He1, X.L. Gong1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.018.003
Abstract Three-dimensional (3D) woven carbon/carbon (C/C) composites have attracted considerable attention in recent years. In comparison to the laminated composites, the carbon composites show better merit due to their strong through-the-thickness properties, high damage tolerance, and dimensional stability. However, the deformation of these materials is usually non-uniform. The strain field distribution is highly dependent on the heterogeneity of 3D woven structure. Therefore, the traditional techniques such as strain gauge are not suitable for measuring the deformation.
In this presentation, a full-field digital image correlation (DIC) technique was developed. The Iosipescu shear test (v-notched beam test) was employed to load the… More >
Open Access
ABSTRACT
Yansheng He, Qingchuan Zhang, Shihua Fu, Qi Hu
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 5-6, 2011, DOI:10.3970/icces.2011.018.005
Abstract Abstract: The interaction of dislocation and solute atoms has great influence on the macroscopic mechanical behavior in alloys as well as the deformation of alloys. A dynamic Monte Carlo method is developed to simulate the interaction between dislocation and solute atom. The results show that dislocation motion is retarded by solute atoms in certain conditions. In the condition of constant external stress, the retarding effect of solute atoms becomes more inefficient with the increment of external stress. In the condition of constant stress rate, a step-like curve of the displacement-time indicates the intermittent motion of dislocation exhibiting dynamic strain aging… More >
Open Access
ABSTRACT
Dein Shaw, Chih Ren Huang, Yi Chi Pan
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 7-8, 2011, DOI:10.3970/icces.2011.018.007
Abstract A nonlinear curved spring has a free form shape. In this study, the curved beam is applied a nonlinear load, the load on the spring is pointed to a certain point of the space. This curved spring can be used in an orthosis. A certain load-deformation relation of curved spring which used in orthosis can assist the subject wearing the orthosis to climb the stairs. The analysis of the curved spring should be non-linear due to the applied load is a constant but its direction is point to a certain point. The deformation is hard predicted correctly for this spring.… More >
Open Access
ABSTRACT
Hongwei Guo
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 9-10, 2011, DOI:10.3970/icces.2011.018.009
Abstract It is an urgent need in engineering to measure the three-dimensional (3-D) shape of an object with specular surfaces by using optical techniques, despite some attempts for performing this task. This paper presents a moirAC-based technique for measuring the three-dimensional shapes of specular surfaces. In it, a Ronchi grating is closely located before the measured object and illuminated by a diffusive light source. When we observe the measured object through this grating, moirAC fringes are generated by the superposition of this grating and its virtual image produced by the measured specular surface. With this scheme, the movements of the grating… More >
Open Access
ABSTRACT
Jia Fei, Xiu-Peng Zheng, Yan-Ping Cao*, Xi-Qiao Feng
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 11-12, 2011, DOI:10.3970/icces.2011.018.011
Abstract Recently, a novel technique based on the wrinkling of a bilayer composite film resting on a compliant substrate was proposed to measure the elastic moduli of thin films. In this paper, this technique is studied via theoretical analysis and finite element simulations. We find that under an applied compressive strain, the composite system may exhibit various buckling modes, depending upon the applied compressive strain, the geometric and material parameters of the system. We elucidate the physical mechanisms underlying the occurrence of two most typical buckling modes from the view point of energy. When the intermediate layer is much thicker than… More >
Open Access
ABSTRACT
P. Zhao, G. Shi
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 13-14, 2011, DOI:10.3970/icces.2011.018.013
Abstract The Poisson's ratios of a single layered graphene sheet and single-walled carbon nanotubes (SWCNTs) are computed using an improved equivalent structural mechanics model where the bond angle variations are modeled by the flexible connections of framed structures. The accuracy of the results given by the present model is evaluated by comparing the predicted results with the experimental data and the theoretical and computational results reported in the literature. It is shown that the Poisson's ratios given by the present computational model agree with the experimental data. The present result shows that the Poisson's ratios of both graphene and SWCNTs are… More >
Open Access
ABSTRACT
Yuan Weifeng, Tan Kang Hai
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 15-16, 2011, DOI:10.3970/icces.2011.018.015
Abstract Generally, the computational efficiency in numerical analysis is dependant on the degree of freedom in the model under investigation. To reduce computational cost without altering the accuracy of numerical findings, an algorithm is introduced in this manuscript to develop macro element. When this method is incorporated into finite element analysis, all the members in the nonlinear zones of a structure can be grouped into just one macro element. With the presence of weak member method, the stiffness matrix of this macro element can be evaluated through analyzing the response of the original structure induced by a series of fictitious unit… More >
Open Access
ABSTRACT
ZHANG Rong-gang1, 2,*, ZHANG Hong-tao3, BAI Yu-xing3, GAO Jian-ling3, ZHANG Lai-yong2, XU Bing-ye1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 17-18, 2011, DOI:10.3970/icces.2011.018.017
Abstract Based on the upper bound theorem, the fire resistance is studied using the combination of element collapse mechanisms of steel frames, where the element collapse mechanisms are automatically determined from independent mechanisms. The fire limit load is calculated by solving a nonlinear mathematical programming. The computing procedure is programmed by FORTRAN language. Results show that this method is useful to find the collapse mechanism with the lowest fire limit load, which can provide a theoretical and practical way for the fire design of steel frame structure. More >
Open Access
ABSTRACT
Qian Kemao
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 19-20, 2011, DOI:10.3970/icces.2011.018.019
Abstract When a fringe pattern is obtained, it needs to be analyzed in order to extract the
desired information. In this talk, we are going to introduce some fringe pattern
analysis techniques that we proposed recently, such as windowed Fourier transform (WFT) [1], coherence enhancing diffusion (CED) [2], and frequency-guided
sequential demodulation (FSD) [3]. Some results, along with discussions, are given
for the following cases:
1. Filtering one fringe pattern
2. Phase retrieval from one closed fringe pattern
3. Phase retrieval from one carrier fringe pattern
4. Phase shift retrieval from two fringe patterns
5. Phase retrieval from a sequence of… More >
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