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.
|Number of pages||8|
|Journal||Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an|
|Publication status||Published - 2007 Jan 1|
All Science Journal Classification (ASJC) codes