Open Access

ABSTRACT

Sergei Bronnikov¹, Sergei Kostromin, Vyacheslav Zuev
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 207-214, 2009, DOI:10.3970/icces.2009.009.207
Abstract Kinetics of the ordered phase growth in a melted multi-component liquid crystalline mixture subjected to a deep cooling was studied using polarizing optical microscopy. The droplets of the ordered phase revealed in the optical images across the phase transition were segmented and treated statistically. In the resulting histograms, two overlapping statistical ensembles related to two main components of the mixture were recognized. These ensembles were successfully described using principles of irreversible thermodynamics and the mean droplet diameters within both ensembles were determined. Analysis of the mean droplet diameter as a function of time allowed recognition of two regimes involved in… More >

View

1102

Download

829

Open Access

ABSTRACT

Wen Chen¹, Hongguang Sun¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 215-218, 2009, DOI:10.3970/icces.2009.009.215
Abstract This report is to make a survey on the numerical techniques for fractional derivative equations in mechanical and physical fields, including numerical integration of fractional time derivative and emerging approximation strategies for fractional space derivative equations. The perplexing issues are highlighted, while the encouraging progresses are summarized. We also point out some emerging techniques which will shape the future of the numerical solution of fractional derivative equations. More >

View

1038

Download

761

Open Access

ABSTRACT

C. K. Chao, J. Lin, C. C. Hsu, Y. Amaritsakul
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 219-221, 2009, DOI:10.3970/icces.2009.009.219
Abstract The gamma nail and dynamic hip screw have been widely used for the treatment of proximal femur fracture. From the clinical point of view, the implants may fail and caused loss of fracture fixation in the impairment of fracture healing. The purposes of this study were to evaluate the performance of those two commercial available fracture fixators and newly design implant (double screw nail).
The whole modeling process was using SolidWork 2006 and then Finite element method was applied to simulate the real situation during the proximal femur treatment. Three types of implants (DHS, TGN, and DSN) were analyzed in… More >

View

1031

Download

773

Open Access

ABSTRACT

Masanori Kikuchi¹, Yoshitaka Wada², Hitomi Suyama³, YuLong Li⁴
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 222-224, 2009, DOI:10.3970/icces.2009.009.222
Abstract Prediction of fatigue crack growth in mechanical component is one of the most important problems to prevent catastrophic fracture accident. FEM is generally used for this purpose, but as crack shape changes during growing process, it is necessary to re-mesh for new crack shape. It is time consuming and is very difficult especially for 3-d. problem.
In this study, S-version FEM^[1][2] is employed to solve this problem, and fully automatic crack growth simulation system is made by combining with automatic mesh generationsystem. In the 3-d. field, crack tip stressconditionbecomes under mixed mode condition, and three stress intensity factor, K_I,K_II and… More >

View

1121

Download

836

Open Access

ABSTRACT

R.M.A. Marretta¹, C. Orlando¹, M. Carley²
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 225-232, 2009, DOI:10.3970/icces.2009.009.225
Abstract A propeller low noise design procedure based on boundary integral equation is presented. The aerodynamic field is computed via a potential-based boundary element method for lifting body while the aeroacoustic emitted field is calculated on the basis of the Ffowcs Williams-Hawkings equation. Families of airfoils sections are aerodynamically processed to select the ones that meet the requested performance. Successively, the airfoil sections characterized by the lowest noise emission, among the previously selected ones, are chosen to built the propeller blade. Eventually the whole propeller aeroacoustic performances are analyzed. More >

View

1020

Download

820

Open Access

ABSTRACT

Takéhiko Nakama¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 233-242, 2009, DOI:10.3970/icces.2009.009.233
Abstract Random noise perturbs objective functions in a variety of practical optimization problems, and genetic algorithms (GAs) have been widely proposed as an effective optimization tool for dealing with noisy objective functions. In this paper, we investigate GAs applied to objective functions that are perturbed by multiple sources of additive and multiplicative noise that each take on finitely many values. We reveal the convergence properties of GAs by constructing and analyzing a Markov chain that explicitly models the evolution of the algorithms in noisy environments. Our analysis shows that this Markov chain is indecomposable; it has only one positive recurrent communication… More >

View

987

Download

736

Open Access

ABSTRACT

P. Kolarkar¹, M. Mahendran, S. Gunalan
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 243-244, 2009, DOI:10.3970/icces.2009.009.243
Abstract Fire safety of light gauge cold-formed steel frame (LSF) stud wall systems is critical to the building design as their use has become increasingly popular in commercial, industrial and residential construction throughout Australia. These walls are made of a cold-formed steel frame lined with multiple plasterboards (up to 4 on each side) and are often used as load-bearing walls. Currently there is limited design information on LSF load bearing walls for use by Australian engineers and designers. Hence LSF wall manufacturers depend on full scale fire tests using the standard fire curve based on ISO834 and AS1530.4 to determine the… More >

View

1019

Download

752

Open Access

ABSTRACT

En-Cheng Liu¹, Syh-Tsang Jenq^1,2, Shih-Wei Kung³, Chie Gau¹, Hsin-Luen Tsai⁴, Cheng-Ching Lee⁵, Yu-Der Chen⁵
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 245-246, 2009, DOI:10.3970/icces.2009.009.245
Abstract The purpose of the present work is to study the disc brake squeal problem for passenger cars in order to reduce the instable high frequency squeal modes. The ABAQUS/Standard implicit method was used to perform dynamic contact vibration analysis of the current disc brake finite element model. The disc brake system studied here contains the caliper, bracket, brake disc, and brake pad. Notice that brake pad in general contains both brake lining and brake shoe. The brake pad with a specific chamfer pattern and the brake disc with a series of cooling ribs for ventilation were numerically constructed in the… More >

View

1033

Download

905

Open Access

ABSTRACT

Tei-Chen Chen^1,2, Heng-Chieh Wang¹, Shu-Fan Wu¹, Yen-Hung Lin¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 247-262, 2009, DOI:10.3970/icces.2009.009.247
Abstract Mechanical properties of materials in the micro- and nano-meter scale have been successfully obtained by using the indentation technique. Up to now, large-scale atomistic models to simulate the experimental condition, however, still remain computationally demanding. In this article, a simple and accurate method is proposed to derive the intermolecular potential functions of coarse-grained molecular dynamics (CGMD) suitable for various single crystalline materials. This CGMD technique is then provided to simulate nano-indentation process to verify its accuracy and reliability. Simulation results evaluated by CGMD approach are obtained and compared to those predicted by MD. It is found that the results predicted… More >

View

1069

Download

839

Open Access

ABSTRACT

S.T. Jenq^1,2, Y.S. Chiu², Y.C. Ting²
The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 263-264, 2009, DOI:10.3970/icces.2009.009.263
Abstract The purpose of this work is to study the transient hydroplaning behavior of inflated pneumatic 195/65R15 radial tires with various tread patterns and the tires were loaded with a quarter car weight. The tires were analyzed numerically to roll over a water film with a thickness of 5 mm, 10 mm and 15 mm on top of a flat-road pavement. Current tire structure contains the outer rubber tread and the inner advanced reinforcing composite layers. The Mooney-Rivlin constitutive law and the classical laminated theory (CLT) were used to describe the behavior of the large-deformable rubber tread material and reinforcing composite… More >

View

1156

Download

763