کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
771192 | 897613 | 2008 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Depth sensing indentation of linear viscoelastic–plastic solids: A simple method to determine creep compliance Depth sensing indentation of linear viscoelastic–plastic solids: A simple method to determine creep compliance](/preview/png/771192.png)
Viscoelastic solids may deform plastically under indentation. This leads to an overestimation of the creep compliance when the analytical solution for indentation of linear viscoelastic materials [Lu H, Wang B, Ma J, Huang G, Viswanathan H. Measurement of creep compliance of solid polymers by nanoindentation. Mech Time-Depend Mater 2003;7(3–4):189–207] is used for its determination. Using finite element analysis, in this work it is shown that the plastic and viscoelastic deformation processes occur simultaneously, even during holding of a constant indentation load. A simple procedure to separate the viscoelastic response from the plastic response is proposed, which involves spherical indentations at different loads. To illustrate the proposed method, indentation tests are conducted on a polymer, polymethylmethacrylate (PMMA), and its viscoelastic properties are determined.
Journal: Engineering Fracture Mechanics - Volume 75, Issue 17, November 2008, Pages 4852–4862