TY - JOUR
T1 - Experimental and FEM analysis of mar behavior on amorphous polymers
AU - Du, Shuoran
AU - Hamdi, Marouen
AU - Sue, Hung Jue
PY - 2020/3/15
Y1 - 2020/3/15
N2 - Mar is a type of subtle surface damage caused by a sliding object barely visible to human eyes. This minor damage phenomenon has rarely been systematically studied. Significant research efforts for the fundamental understanding of mar behavior in polymers are still needed. In this study, the mar behavior of a series of model amorphous polymers, i.e., polymethylmethacrylate (PMMA), polycarbonate (PC), and polystyrene (PS), were investigated based on a modified ASTM/ISO scratch testing methodology and a corresponding finite element method (FEM) modeling. Furthermore, the mar-induced visibility and material parameter relationships were established through a systematic FEM parametric study. Experimental results show that PMMA has the highest mar visibility resistance, indicated by lower surface roughness variation and low contrast between marred region and the background. The numerical analysis showed that the maximum principal plastic strain (ε1p) and total dissipated plastic energy (Ep) can be considered for evaluating mar visibility resistance. Higher mar visibility resistance corresponds to lower ε1p and Ep values. Based on these two criteria, the parametric analysis shows that mar visibility resistance increases with lower modulus, higher yield stress, higher hardening slope, and lower softening slope. The usefulness of the present study for the preparation of mar resistant polymers is discussed.
AB - Mar is a type of subtle surface damage caused by a sliding object barely visible to human eyes. This minor damage phenomenon has rarely been systematically studied. Significant research efforts for the fundamental understanding of mar behavior in polymers are still needed. In this study, the mar behavior of a series of model amorphous polymers, i.e., polymethylmethacrylate (PMMA), polycarbonate (PC), and polystyrene (PS), were investigated based on a modified ASTM/ISO scratch testing methodology and a corresponding finite element method (FEM) modeling. Furthermore, the mar-induced visibility and material parameter relationships were established through a systematic FEM parametric study. Experimental results show that PMMA has the highest mar visibility resistance, indicated by lower surface roughness variation and low contrast between marred region and the background. The numerical analysis showed that the maximum principal plastic strain (ε1p) and total dissipated plastic energy (Ep) can be considered for evaluating mar visibility resistance. Higher mar visibility resistance corresponds to lower ε1p and Ep values. Based on these two criteria, the parametric analysis shows that mar visibility resistance increases with lower modulus, higher yield stress, higher hardening slope, and lower softening slope. The usefulness of the present study for the preparation of mar resistant polymers is discussed.
KW - Amorphous polymers
KW - Finite element method
KW - Mar performance
KW - Parametric analysis
KW - Surface damage
UR - http://www.scopus.com/inward/record.url?scp=85076628886&partnerID=8YFLogxK
U2 - 10.1016/j.wear.2019.203155
DO - 10.1016/j.wear.2019.203155
M3 - Article
AN - SCOPUS:85076628886
SN - 0043-1648
VL - 444-445
JO - Wear
JF - Wear
M1 - 203155
ER -