Nonlinear time dependent behaviour of epoxy resins

37th Risø International Symposium on Materials Science

Marotzke, C.^1 ; Feldmann, T.^1

BAM, Division 5.3, Mechanics of Polymers, Unter den Eichen 87, Berlin

12205, Germany^1

关键词: Creep behaviour;    Exposed to;    Initial strains;    Local strains;    Nonlinear behaviours;    Residual strains;    Strain field measurement;    Time-dependent behaviour;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/139/1/012035/pdf
DOI  :  10.1088/1757-899X/139/1/012035

来源: IOP

【 摘 要 】

The nonlinear behaviour of epoxy resins is studied on standard tensile tests. A strain field measurement system is applied (Aramis) in order to monitor local strains. The residual strain is measured by recovering the specimens for up to 68 hours after unloading. The time span the specimen is exposed to load has a large influence on the creeping process and the residual strain after recovering. This is studied by comparison of instantaneous unloading with keeping the specimen under permanent load for thirty minutes. It is shown that moderate differences in the initial strain can lead to large differences in the creep behaviour as well as in the residual strain.