Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
PDFdownloadsize：6.27MBviewed：download：| Corresponding author | Institute | |
| WANG Zhihua | Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology |
PMMA sheets were subjected to 85 ℃ and 85% relative humidity for different times and then applied to nanoindentation tests to investigate the effects on PMMA nanomechanics with the coupling of hygrothermal aging and strain rate.The test adopted five strain rates.Results show that both the hygrothermal aging and loading strain rate affect the property of PMMA.The hygrothermal aging increases the creep property of PMMA with respect to unaged sample.Meanwhile, the effect of aging time on PMMA nanomechanics can be divided into three stages:initial aging stage (010 d) , unstable stage (1022 d) and stable stage (2233 d) ;As for loading strain rate, the elastic modulus and hardness increase as the strain rate increases.Furthermore, at high strain rate, more viscous deformation is accumulated after loading stage, transforming into larger creep deformation and higher initial creep strain rate.