Strain Fluctuations from DIC Technique Applied on Paper

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
Conference article in proceedings
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
2678-2683
Series
ICM11, Lake Como Italy, June 5-9, 2011
Abstract
We study the evolution of deformation on a quasi 2D paper sample during fatigue and creep experiments. Paper is a fibrous material, sensitive to various parameters (humidity, temperature, history effect). As for many materials, the lifetime varies a lot. Basquin's law claims that the number of cycles at break in fracture tests has a power-law dependence on the external load amplitude; Monkman-Grant relationship predicts that lifetime is proportional to the minimum strain rate during creep. The main question is therefore: is it possible to predict the time-dependent rupture? We perform creep and cyclic tests on paper samples. The main tools of investigation are acoustic emission (AE) -based analysis and digital image correlation (DIC). Via the AE, one can follow the damage evolution in samples, like microcrack formation that releases elastic energy. The DIC instead works well as a tool to measure at great accuracy both global and local deformation fields. From these, local strain rates can be derived, which then can be used to understand the microscopic dynamics that lie behind a certain rheology or sample response. The issue is to predict the break by looking at the sample-to-sample variation and by comparing experiments.
Description
Keywords
Creep and fatigue, heterogenous material, strain from DIC acoustic emissions
Other note
Citation
Miksic , A , Koivisto , J , Rosti , J & Alava , M 2011 , Strain Fluctuations from DIC Technique Applied on Paper . in L Vergani & M Guagliano (eds) , 11th International Conference on the Mechanical Behavior of Materials (ICM11), Lake Como, Italy, June 5-9, 2011 . Procedia Engineering , vol. 10 , Elsevier , pp. 2678-2683 , International Conference on the Mechanical Behavior of Materials , Milano , Italy , 05/06/2011 . https://doi.org/10.1016/j.proeng.2011.04.446