1. Research Group of Fatigue and Surfaces, Mechanical Engineering School, Universidad del Valle, Cali, Colombia
2. Energetics and Mechanics Department, Universidad Autónoma de Occidente, Cali, Colombia
3. Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA
4. Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA