期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2017
卷号：8
期号：6
页码：491-500
出版社：International Energy and Environment Foundation (IEEF)
摘要：In some countries such as Iraq, the high temperature and high exposure to ultraviolet (UV) rays in summer, result in changes to the mechanical and physical properties of polypropylene sockets. In this study four groups of sockets were exposed to ultraviolet rays for different periods of time: zero, 20 hours, 40 hours and 60 hours. Also, the stress relaxation modulus was measured for these groups at 50 oC. Also, the effect of ultraviolet on the stress relaxation modulus, tensile strength, hardness and morphology of polypropylene is determined. The interface pressure is measured between the prosthetic below the knee socket and stump by f-socket sensors and then this socket is modeled by ANSYS 15 Workbench, from results the stress relaxation modulus decreases with increasing UV exposure time and temperature. As a result of high temperature and high exposure of ultraviolet (UV) ray in summer in some countries such as (Iraq), the mechanical and physical properties of polypropylene socket are changed. In this study there a four groups of polypropylene were exposure by ultraviolet ray at different time, zero, 20 hours, 40 hours and 60 hours .Also, the stress relaxation modulus was measured for these groups at 50 OC. So the main aim of this study is to find the effect of ultraviolet on the stress relaxation modulus, tensile strength, hardness and morphology of polypropylene .The interface pressure is measured between the prosthetic below the knee socket and stump by f-socket sensors then modeling this socket by workbench ANSYS 15. The ultimate stresses are decreasing with time and the hardness are alternative value, it is decreasing at 20 hours exposure UV and then increasing at 40 hours and 60 hours . The modulus of stress relaxation at not exposure specimen down a lot compared with the other groups this behavior led to deflection of socket is increasing.
