An instrumented indentation method for evaluating the effect of hydrostatic pressure on the yield strength of solid polymers

作者：Peng, Guangjian; Feng, Yihui; Wen, Donghui; Zhang, Taihua^*

来源：Journal of Materials Research, 2014, 29(24): 2973-2981.

DOI：10.1557/jmr.2014.330

• DEPTH-SENSING INDENTATION
• VISCOELASTIC-PLASTIC SOLIDS
• MECHANICAL-BEHAVIOR
• SHARP INDENTATION
• CREEP COMPLIANCE
• INDENTERS
• NANOINDENTATION
• TESTS
• LOAD
• TIP

The yield behavior of solid polymers may be influenced by the hydrostatic pressure, strain rate, and temperature. In the present work, we focus on evaluating the effect of hydrostatic pressure on the yield strength by instrumented indentation. Using dimensional analysis and finite element analysis, two analytical expressions were derived to relate the indentation data to the plastic properties, and a method for extracting the coefficient of internal friction which reflects the effect of hydrostatic pressure on the yield strength was established. Applications were illustrated on polypropylene (PP), polycarbonate (PC), and unplasticized polyvinyl chloride (UPVC). The coefficient of internal friction determined by this indentation method is 0.20 +/- 0.02 for PP, 0.07 +/- 0.01 for PC, and 0.10 +/- 0.01 for UPVC, which are in good agreement with the values reported in the literature. This demonstrates the proposed indentation method which is useful to evaluate the effect of hydrostatic pressure on the yield strength of solid polymers.

• 出版日期2014-12-28
• 单位非线性力学国家重点实验室; 中国科学院; 浙江工业大学