caa a22 4500 37890373X CHVBK 20180305123524.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.255 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.255 Determination of wear of surfaces by scratch testing [Elektronische Daten] [Witold Brostow, Gowrisankar Darmarla, Juliet Howe, Dorota Pietkiewicz] We have formulated a quantitative definition of wear different from the current imprecise definitions. Wear is defined as the unwanted loss of solid material from solid surfaces due to mechanical interaction. The debris method currently used to quantify wear produces results strongly dependent on conditions. We have performed multiple scratch tests for a variety of polymer samples: polypropylene, polytetrafluoroethylene and a polyester. In each of the materials studied, the scratch penetration depths reach a constant value at a given force after 8 scratches or so. Similarly, the scratch recovery (final, healing) depths for a fixed force reach a plateau after a dozen or so scratch tests. Thus, strain hardening by repetitive scratching takes place. A likely explanation is formation of a more ordered phase - as seen before in mechanical tests by Siegmann, Aharoni, Faitelson et al. Given these results we define a measure of wear W(F) for a given indenter geometry and force F as W(F) = limn→∞ Rh(F) where n is the number of tests performed and Rh is the final (residual, healing) depth after viscoelastic recovery. The present results confirm also our earlier ones that scratch recovery is another useful way to characterize viscoelasticity. © 2013 by Walter de Gruyter GmbH & Co. Brostow Witold Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM aut Darmarla Gowrisankar Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM aut Howe Juliet Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM aut Pietkiewicz Dorota Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM aut e-Polymers De Gruyter 4/1(2004-12-01), 255-262 2197-4586 4:1<255 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.255 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.255 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Brostow Witold Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM/ aut NATIONALLICENCE 700 1- Darmarla Gowrisankar Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM/ aut NATIONALLICENCE 700 1- Howe Juliet Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM/ aut NATIONALLICENCE 700 1- Pietkiewicz Dorota Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science & Engineering, University of North Texas, Denton, TX 76203-5310, USA; http://www.unt.edu/LAPOM/ aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 255-262 2197-4586 4:1<255 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter