Rate sensitivity and deformation mechanism of semi-crystalline polymers during instrumented indentation

被引：1

作者：

Liu, Erqiang ^{[1
]}

Wu, Jianguo ^{[1
]}

Li, Huaying ^{[1
]}

Liu, Haitao ^{[2
]}

Zhao, Guanghui ^{[3
]}

Kong, Lingyu ^{[1
]}

Lin, Jinbao ^{[1
]}

Xiao, Gesheng ^{[4
]}

Jia, You ^{[1
]}

机构：

[1] Taiyuan Univ Sci & Technol, Coll Appl Sci, Taiyuan 030024, Peoples R China

[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang, Peoples R China

[3] Taiyuan Univ Sci & Technol, Heavy Machinery Engn Res Ctr, Minist Educ, Taiyuan, Peoples R China

[4] Taiyuan Univ Technol, Coll Mech & Vehicle Engn, Inst Appl Mech, Taiyuan, Peoples R China

来源：

JOURNAL OF POLYMER SCIENCE | 2021年 / 59卷 / 05期

基金：

中国国家自然科学基金;

关键词：

indentation; loading index; rate sensitivity; strain rate; unloading stiffness; STRAIN-RATE SENSITIVITY; METALLIC MATERIALS; BEHAVIOR; CREEP; PHASE; LOAD;

D O I：

10.1002/pol.20200767

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Instrumented indentation tests using both constant loading rate (CLR) and continuous stiffness measurement (CSM) operation modes were performed to investigate the deformation mechanism and their sensitivity to the deformation rate in semi-crystalline polymers through the quantitative analysis of load-depth loading and unloading curves. The strain rate was constant during the CSM tests, while the strain rate decreased with the increasing of loading time in CLR tests. The mechanical response mechanism of the semi-crystalline polymers to these tests was very complicated because of the combined effects of strain-hardening in the crystal phase and strain-softening in the amorphous phase. Results show that the loading index m reflects the strain-hardening or strain-softening response during indentation. When m > 2, the mechanical response was due to the strain-hardening, and when m < 2, the response was due to strain-softening. A method based on the measured contact hardness was proposed to obtain the unloading stiffness, and the other mechanical parameters could then be determined according to the unloading stiffness.

引用

页码：451 / 461

页数：11

共 31 条

[11] The characterization of creep and time-dependent properties of bulk metallic glasses using nanoindentation [J].