کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7824462 | 1502920 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Defining the limits to long-term nano-indentation creep measurement of viscoelastic materials
ترجمه فارسی عنوان
تعریف محدودیت ها برای اندازه گیری ناگهانی نانو تند از مواد ویسکولاستیک
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
An ultra-stable instrumented nano-indentation tester (UNHT, Anton Paar) was used to study extremely long (30,000â¯s) indentation creep of polymers. Total drift rate, measured on fused silica and sapphire samples, was less than 0.2 pm/s for up to 10â¯h, enabling collection of valid, low-uncertainty, long-term creep data - orders of magnitude longer than previously possible. Fits of the popular N-element Kelvin model to indentation creep data gave values of instant elastic modulus E0â and infinite modulus Eââ strongly dependent on the time-span of data fitted. Comparison with the long-term experimental data showed that the model was unable to use short term data to predict creep at the much longer times required by industry. A new analysis method is proposed to obtain a better estimate of the true value of infinite modulus, Eââ, which is the simplest indicator of maximum dimensional change of polymeric material components subject to long-term stress.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 70, September 2018, Pages 297-309
Journal: Polymer Testing - Volume 70, September 2018, Pages 297-309
نویسندگان
X.D. Hou, N.M. Jennett,