کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1651488 | 1517341 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Creep-recovery behaviour of cork
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Creep-recovery behaviour of cork Creep-recovery behaviour of cork](/preview/png/1651488.png)
چکیده انگلیسی
Creep tests were performed in cork samples under compression, at different temperatures between 0 and 50 °C. Master curves for the creep behaviour along the radial and axial directions could be constructed from short-time creep experiments, that could be described by a simple empirical model. The temperature shift factors were used to build a relaxation plot, where, assuming an Arrhenius model, an activation energy of 172 kJ molâ 1 was obtained from the data in the two principal directions. Comparison with previous dynamic mechanical analysis (DMA) and dielectric results suggests that the relaxation behaviour observed around room temperature could play an active role in the molecular mechanisms underlying the creep process in cork. From preliminary recovery studies it was seen that a fraction of the strain resulting from creep is preserved permanently, especially if the load is applied along the axial direction. This irreversible strain exhibited a linear relationship with the logarithm of the creep time, thus not being related to the irreversible viscous flow intrinsic to the material. Scanning electronic microscopy observations showed that creep could, in fact, lead to the bucking of the cellular structure of cork, this process being an active and time-dependent contributor for the permanent deformation of cork upon creep.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 61, Issues 11â12, May 2007, Pages 2473-2477
Journal: Materials Letters - Volume 61, Issues 11â12, May 2007, Pages 2473-2477
نویسندگان
J.F. Mano,