Application of Time-Temperature-Stress Superposition Principle to Nonlinear Creep of Poly(methyl methacrylate) |
| Journal |
Key Engineering Materials (Volumes 340 - 341) |
| Volume |
Engineering Plasticity and Its Applications |
| Pages |
1091-1096 |
| DOI |
10.4028/www.scientific.net/KEM.340-341.1091 |
| Online since |
June, 2007 |
| Authors |
Wen Bo Luo,
Chu Hong Wang,
Rong Guo Zhao
|
| Keywords |
Master Curve, Nonlinear Creep, Shift Factor, Time-Temperature-Stress Superposition |
| Abstract |
The uniaxial tensile creep of a commercial grade Poly(methyl methacrylate) was
measured for 4000 seconds under various temperatures and stress levels ranging from 14 oC to
26 oC and 6 MPa to 32 MPa. The resultant creep compliance curves depart from each other for
stresses beyond a critical value which varies with temperature, indicating nonlinear viscoelastic
behavior. The time-temperature-stress superposition principle (TTSSP) was used to construct a
smooth master compliance curve with a much longer time-scale interval from the short-term tests at
higher stresses and temperatures. It is shown that the master curve covers a period of over 290 days,
which is nearly 3.9 decades longer than the test duration. Moreover, it is verified that the
time-temperature shift factors are dependent on stresses at which the shifts are applied, and that the
time-stress shift factors are dependent on reference temperatures. |
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