Open Access
ABSTRACT
Yoshiyuki Furuya
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 1-2, 2011, DOI:10.3970/icces.2011.016.001
Abstract Gigacycle fatigue takes place in high-strength steel. In this case, fish-eye fracture eliminates a conventional fatigue limit. This means that the fish-eye fracture is a key to understand the gigacycle fatigue of high-strength steel. Evaluation of gigacycle fatigue properties needs accelerated fatigue testing since gigacycle fatigue tests take long time. For example, a 109-cycles fatigue test takes more than 3 months at conventional 100 Hz. For this acceleration, ultrasonic fatigue testing is a very powerful tool since it achieves 20 kHz and completes the 109-cycles in a day. However, frequency effects must sufficiently be investigated before using the ultrasonic fatigue… More >
Open Access
ABSTRACT
Q. Chen, K. Kariya
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.016.003
Abstract Abstract Al alloys have been widely used as engineering materials in many machines and structures because of their excellent properties such as high specific strength, high resistance to corrosion and easy to recycle. Especially, high strength Al alloys are effective to reduce environment load through achieving low fuel consumption in automobile engines. On the other hand, high strength Al alloys have no definite fatigue limit and their fatigue strengths are very low in comparison with their high static strengths. It is important to know the fatigue strength of high strength Al alloys in the long life region beyond 107 cycles… More >
Open Access
ABSTRACT
LIU Yong-jie, TIAN Ren-hui, OUYANG Qiao-lin, WANG Qing-yuan
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 5-6, 2011, DOI:10.3970/icces.2011.016.005
Abstract Ti-6Al-4V is widely used in biology engineering as well medical implant. Clinical investigations show that TC4 implant could have rupture of passivation film and visible corrosion. To predict service life of the Ti-6Al-4V implant, it is necessary to study its ultra-high cycle fatigue behaviors in physiological environment exceeding 107 cycles. In this paper, using the ultrasonic fatigue testing technique, the high cycle and ultra-high cycle fatigue properties of Ti-6Al-4V subjection to simulated body fluid (SBF) in body temperature were studied and compared with that of normal Ti-6Al-4V. The experimental results show that SBF subjection has slight influence on the ultra-high… More >
Open Access
ABSTRACT
T. Sakai, W. Li, B. Lian, N. Oguma
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 7-8, 2011, DOI:10.3970/icces.2011.016.007
Abstract Long term use of mechanical products provides us a lot of positive environmental effects such as saving resources, saving energy, reducing environmental load to globe and reducing the industrial wastes. Thus, fatigue property of metallic materials in very high cycle regime such as gigacycles has been a new important subject to ensure the long durability of actual mechanical structures during the latest decades. From this point of view, fatigue tests in the long life regime were performed for various kinds of metallic materials by many researchers and a series of experimental results were reported. One of most typical aspect in… More >
Open Access
ABSTRACT
James D. Turner, Manoranjan Majji, John L. Junkins
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 9-10, 2011, DOI:10.3970/icces.2011.016.009
Abstract Numerical integration methods have been developed for predicting the evolution of the response of dynamical systems. Standard algorithms approach approximate the solution at a future time by introducing using a truncated power series representation that attempts to recover an n-th order Taylor series approximation, while only numerically sampling a single derivative model. Successful applications of this approach include: (1) Runge-Kutta methods which build up an approximation for a single step; (2) Predictor-Correction methods that use several back solutions to approximate the next step, and (3) Gear methods for handling stiff differential equations. The major innovation of this paper is the… More >
Open Access
ABSTRACT
James D.Turner, Manoranjan Majji, John L. Junkins
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 11-12, 2011, DOI:10.3970/icces.2011.016.011
Abstract Modeling uncertainty for nonlinear systems is often handled by developing a mathematical model, defining suitable parameters, establishing suitable initial conditions and numerically integrating the system response in order to study the behavior of the system. The potential range of behaviors that can be realized is assessed by varying the model parameters, integrating the response, and recording the changes in the system behaviors. In theory this process is straightforward for implementing. The only potential barrier to carrying out the repeated integrations of the system dynamics is the availability of powerful computer resources that can provide the density of sample points required… More >
Open Access
ABSTRACT
Yuan-Qi Li, Li-Ping Wang, Zu-Yan Shen
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 13-14, 2011, DOI:10.3970/icces.2011.016.013
Abstract In structural design, sometimes analysis methods in available specifications cannot be used directly for new materials or new structural configurations. A common way is to test and check the behavior in question of the prototype units including complete or parts of structures, individual members or connections for design assessment. How to directly obtain the design capacity with an expected reliability level according to the related codes from test results is a critical issue. Currently, there isn't any explicit specification for the above issues in Chinese codes, and few references are available. In this paper, referring to Australian specifications for Cold-formed… More >
Open Access
ABSTRACT
Syh-Tsang Jenq, Yuen-Sheng Chiu
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 15-16, 2011, DOI:10.3970/icces.2011.016.015
Abstract Current work studies the transient hydroplaning behaviors of 200 kPa inflated pneumatic radial tires with V-shaped grooved tread patterns and then rolls over the water film with a thickness of 10 mm. we also perform complete numerical simulations in order to know how to elevate the hydroplaning capability. Tires were numerically loaded with a quarter car weight of 4 kN on initial step, and then subsequently accelerated from rest rolling over a water film with a thickness of 10 mm on top of a flat roadway. Tire structure is composed of outer rubber tread and inner fiber reinforcing composite layers.… More >
Open Access
ABSTRACT
Xiuling Wang, Darrell W. Pepper
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 17-18, 2011, DOI:10.3970/icces.2011.016.017
Abstract A high-order numerical model is developed to simulate species transport for use in emergency response situations. The model includes employing an hp-adaptive finite element technique to construct velocity fields within complex geometries as well as over irregular terrain features. Lagrangian particles are used to display contaminant dispersion patterns. The use of hp-adaptive finite element methods permit both automatic local refinement and unrefinement of the computational grid - a fine mesh is developed in those regions where flow features and/or species gradients change rapidly while a coarse mesh is employed where flow and transport are unvarying (or smooth). The use of… More >
Open Access
ABSTRACT
Chih-Wen Chang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 19-20, 2011, DOI:10.3970/icces.2011.016.019
Abstract In this study, we propose a new numerical approach for solving the nonhomogeneous backward heat conduction problems (BHCPs). A fictitious time I" is used to transform the dependent variable u(x, t) into a new one by (1+I")u(x, t)=: v(x, t, I"), such that the original nonhomogeneous heat conduction equation is written as a new parabolic type partial differential equation in the space of (x, t, I"). Besides, a fictitious viscous damping coefficient can be employed to strengthen the stability of numerical integration of the discretized equations by utilizing a group preserving scheme. Several numerical instances illustrate that the present algorism… More >
Login
Register
Submit a Paper
Propose a Special lssue