1. Mechanical Engineering Dept., College of Engineering, United Arab Emirates Univ., Al-Anin, P.O. Box 15551, AE (Corresponding author), (On leave from Mechanical Design Department, Faculty of Engineering (Mataria), Helwan University, Cairo, Egypt), e-mail: ahmourad@uaeu.ac.ae
2. Mechanical Engineering Dept., College of Engineering, United Arab Emirates Univ., Al-Ain, P.O. Box 15551, AE.
3. Advanced Technology Corporation, Oak Ridge, TN 37830, US.
4. Department of Mechanical Engineering, Univ. of South Carolina, Columbia, SC 29208; College of Material Science and Engineering, Tianjin Univ., Tianjin, CN 300072.