TY - JOUR
T1 - Effect of experimental conditions on nano-indentation response of low density polyethylene (LDPE)
AU - Yasin, Saima
AU - Shakeel, Ahmad
AU - Iqbal, Tanveer
AU - Ahmad, Fazeel
AU - Mehmood, Hamayoun
AU - Luckham, Paul F.
AU - Ullah, Nehar
PY - 2019
Y1 - 2019
N2 -
Nano-indentation is an interesting tool for analyzing nano-scale mechanical properties. The analysis of nano-mechanical properties as a function of experimental conditions is very critical for designing engineering components. In this study, nano-indentation experiments were performed by considering different values of amplitude (1, 5, 10 nm), frequency (11.2, 22.5, 45 Hz), strain rate (0.02, 0.05, 0.1, 0.2, 1 s
−1
), peak load (10, 30, 100 mN) and hold time (1, 3, 5, 10, 20, 50, 100 sec) to analyze their effect on the mechanical properties of LDPE. The results showed that the effect of amplitude and frequency on the nano-mechanical properties of LDPE were negligible. Load-displacement curves displayed a shift towards higher indentation depths along with a decrease in peak load from 20.6 to 14.8 mN by having a decrease in strain rate from 1 to 0.02 s
−1
. Elastic modulus and hardness values exhibited a decrease with an increase in hold time. Logarithmic creep model was used to fit the experimental data of creep as a function of holding time which showed good agreement (r
2
≥ 0.97) with the experimental values. Recommended holding times are also suggested to eliminate the creep and nose problem in order to achieve high accuracy in measurements.
AB -
Nano-indentation is an interesting tool for analyzing nano-scale mechanical properties. The analysis of nano-mechanical properties as a function of experimental conditions is very critical for designing engineering components. In this study, nano-indentation experiments were performed by considering different values of amplitude (1, 5, 10 nm), frequency (11.2, 22.5, 45 Hz), strain rate (0.02, 0.05, 0.1, 0.2, 1 s
−1
), peak load (10, 30, 100 mN) and hold time (1, 3, 5, 10, 20, 50, 100 sec) to analyze their effect on the mechanical properties of LDPE. The results showed that the effect of amplitude and frequency on the nano-mechanical properties of LDPE were negligible. Load-displacement curves displayed a shift towards higher indentation depths along with a decrease in peak load from 20.6 to 14.8 mN by having a decrease in strain rate from 1 to 0.02 s
−1
. Elastic modulus and hardness values exhibited a decrease with an increase in hold time. Logarithmic creep model was used to fit the experimental data of creep as a function of holding time which showed good agreement (r
2
≥ 0.97) with the experimental values. Recommended holding times are also suggested to eliminate the creep and nose problem in order to achieve high accuracy in measurements.
KW - Amplitude
KW - creep
KW - frequency
KW - hardness
KW - LDPE
KW - modulus
KW - nano-indentation
KW - strain rate
UR - http://www.scopus.com/inward/record.url?scp=85064076076&partnerID=8YFLogxK
U2 - 10.1080/10601325.2019.1593791
DO - 10.1080/10601325.2019.1593791
M3 - Article
AN - SCOPUS:85064076076
SN - 1060-1325
VL - 56
SP - 640
EP - 647
JO - Journal of Macromolecular Science, Part A: Pure and Applied Chemistry
JF - Journal of Macromolecular Science, Part A: Pure and Applied Chemistry
IS - 7
ER -