TY - JOUR
T1 - Evaluation of environmental effects on mechanical properties and characterization of creep behavior of PMMA
AU - Chen, Kuo Shen
AU - Hsu, Rui Fung
N1 - Funding Information:
This work was supported by the National Science Council of Taiwan under contracts NSC-89-2212-E-006-120 and NSC-91-2218-E-006-016. The authors would like to acknowledge Mr. K-S Ou and J-F Yin of NCKU and Mr. Y-C Chao of NCCU for their help in development of the testing apparatus.
PY - 2007
Y1 - 2007
N2 - PMMA is an important polymer used for bio-compatible related applications, usually in environments with body fluids at a temperature higher than room temperature for an extremely long period of operation. Knowledge of mechanical properties of PMMA is therefore needed for successful device longevity design. In this paper, effect on Young's modulus, ultimate tensile strength, and a creep constitutive law of PMMA specimens over a broad range of temperatures between room temperature and 95°C has been presented. In addition, the influence of DI water and saline on the strength and stiffness has also been investigated. Specimens were designed as dog bone shapes and fabricated using an excimer laser micromachining system. The test data indicate that both the modulus and the tensile strength decrease with temperature rise and the presence of DI water or saline can change the microstructure of PMMA and cause a transition from brittle to ductile at room temperature. Finally, a set of 36 creep tests was performed to fit a power law creep model by obtaining the associated creep parameters and the model has been subsequently verified by additional experimental data. The data obtained in this work should be important for design improvements to prolong the stability of PMMA for related applications.
AB - PMMA is an important polymer used for bio-compatible related applications, usually in environments with body fluids at a temperature higher than room temperature for an extremely long period of operation. Knowledge of mechanical properties of PMMA is therefore needed for successful device longevity design. In this paper, effect on Young's modulus, ultimate tensile strength, and a creep constitutive law of PMMA specimens over a broad range of temperatures between room temperature and 95°C has been presented. In addition, the influence of DI water and saline on the strength and stiffness has also been investigated. Specimens were designed as dog bone shapes and fabricated using an excimer laser micromachining system. The test data indicate that both the modulus and the tensile strength decrease with temperature rise and the presence of DI water or saline can change the microstructure of PMMA and cause a transition from brittle to ductile at room temperature. Finally, a set of 36 creep tests was performed to fit a power law creep model by obtaining the associated creep parameters and the model has been subsequently verified by additional experimental data. The data obtained in this work should be important for design improvements to prolong the stability of PMMA for related applications.
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U2 - 10.1080/02533839.2007.9671253
DO - 10.1080/02533839.2007.9671253
M3 - Article
AN - SCOPUS:34047189238
SN - 0253-3839
VL - 30
SP - 267
EP - 274
JO - Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
JF - Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
IS - 2
ER -