Thermally stimulated creep

The stress—relaxation process is governed by a number of different molecular motions. To resolve them, the thermally stimulated creep (TSCr) method was developed, which consists of the following steps. (/) The specimen is subjected to a given stress at a temperature T for a time /, both chosen to allow complete orientation of the mobile units that one wishes to consider. (2) The temperature is then lowered to Tq T, where any molecular motion is completely hindered then the stress is removed. (3) The specimen is subsequendy heated at a controlled rate. The mobile units reorient according to the available relaxation modes. The strain, its time derivative, and the temperature are recorded versus time. By mnning a series of experiments at different orientation temperatures and plotting the time derivative of the strain rate observed on heating versus the temperature, various relaxational processes are revealed as peaks (243). 

Thermally stimulated creep (TSCr) method, 21 742-743 Thermally stimulated current spectrometry (TSC), 21 743 Thermal mass meters, 20 681 Thermal mechanical analysis (TMA), of polyester fibers, 20 21 Thermal motion, in silicon-based semiconductors, 22 237-238 Thermal noise, silicon-based semiconductors and, 22 237 Thermal oxidation, 10 77-78, 79 in VOC control, 20 683-685 Thermal oxidation rates, silicon, 22 490 Thermal oxidizers... 

Demont, P., Fourmaud, L., Chatain, D., and Lacabanne, C., Thermally Stimulated Creep for the study of copolymers and blends, in Polymer Characterization by Interdisciplinary Methods, Craver, C.D. and Provder, T., Eds., Advances in Chemistry Series 227, Washington, D.C., 1990. 

The stress-relaxation process is governed by a number of different molecular motions. To resolve them, the thermally stimulated creep (TSCr) method was developed, which consists of the following steps ... 

An interesting treatment has been proposed by Hopkins in which the temperature is changed according to a prescribed function of time during a transient viscoelastic experiment (creep or stress relaxation). By comparing the results, J(t) or (7(0. with those obtained in a second experiment under conventional isothermal conditions, the factor ay can be calculated over the temperature range concerned. In another modification, termed thermally stimulated creep, a strain is imposed, the temperature is suddenly lowered, and the stress is removed with subsequent temperature increase at a constant rate, the creep recovery is followed. ... 

Demont P, Chatain D, Lacabanne C and Glotin M (1989) Retardation and relaxation behavior of poly(ether-block-amide)s (PEBA) copolymers by thermally stimulated creep (TSCr) and current (TSCu), Makromol Ghem Macromol Symp 25 167-186. 

---