Search In this Thesis
   Search In this Thesis  
العنوان
Wear and Slidind Propeties of Composites /
المؤلف
Abdel-Rahman, Mostafa Abdel-Naby.
هيئة الاعداد
باحث / Mostafa Abdel-Naby Abdel-Rahman
مشرف / Tarek M. Salem
مشرف / Charles L. Beatty
مشرف / Wagih. W. Marzouk
الموضوع
Polymers - Mechanical properties. Composite materials.
تاريخ النشر
1995.
عدد الصفحات
160 P. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
الهندسة الميكانيكية
تاريخ الإجازة
1/1/1995
مكان الإجازة
جامعة المنيا - كلية الهندسه - Mechanical Engineering
الفهرس
Only 14 pages are availabe for public view

from 171

from 171

Abstract

The tribological and mechanical behavior of unfilled high density polyethylene (HDPE) and composite of recycled glass beads (RGB) filled HDPE were investigated. A tribometer, pin on disc type was designed and modified by building a temperature chamber to conduct the dry sliding experiments under various motion parameters such as sliding time, counterface surface roughness, sliding speed, applied pressure and sliding temperature. Also, the influence of internal variables such as glass bead concentration and glass bead si~e on the tribological and mechanical behavior of HDPE were discussed.
There is an optimum in wear resistance as glass bead size and concentration is varied. The optimum value for wear resistance and coefficient of friction appears to be at approximately 10 wt % of glass beads in HDPE for the smallest glass hpad size tested (75 pm). As a result of i.ncreasing the counterface roughness, a continuous increase in the specific wear rate and the coefficient of friction were noticed. A degraded layer of HDPE was observed by FTIR scanning microprobe on the abraded surface as a result of increasing the sliding speed. Although the wear rate increased with the applied pressure a decrease in the coefficient of friction was observed. At higher temperatures the HDPE-RGB showed a slight increase in the wear rate and a noticeable decrease in the coefficient of friction up to 7 SOC at which they increased continuously. AFM examination of the counterface surface topography showed a modification in the counterface asperities. Also, SEM investigation of the abraded surface and the counterface clearly illustrates the phenomena of transferal of a thin film of HDPE to the counterface thereby changing the wear mechanisms. This film thickness was evaluaterl by FTTR spectroscopy and correlated with the motion parameters. Finally, the specific wear rate was found in close correlation with the elastic modulus and both the energy to yield and the energy to failure of the composite.