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Title: Smoothly varying in-plane stiffness heterogeneity evaluated under uniaxial tensile stress

Source: Strain. 53(5): 1-26.

Author(s)Considine, J.M.; Pierron, F.; Turner, K.T.; Lava, P.; Tang, X.

Publication Year: 2017  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-4B

Abstract: Identification of spatially varying stiffness is a challenging, but important, research topic in the mechanics of materials and can provide the necessary information for material suitability, damage, and process control, especially for high?value applications. One homogeneous and 3 heterogeneous virtual field method (VFM) formulations were used to create a methodology for varying stiffness identification. Two finite element method simulations were used to demonstrate the validity and capability of the formulations. A tensile test protocol was implemented to identify spatially varying stiffness of uniaxial tensile paperboard specimens using digital image correlation. A recently published form of VFM, which enforces global equilibrium in the spatial frequency domain, was used to better examine smoothly varying stiffnesses. Two tensile specimens of a single commercial paperboard, known to contain heterogeneities, were examined, and local stiffnesses were identified. Examination of local equilibrium with VFM was used to explain differences in stiffness identification. A polyethylene terephthalate specimen was used to demonstrate homogeneity.

Keywords: DIC; heterogeneity; stiffness; uniaxial tension; VFM

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 09/27/2017

This publication is also viewable on Treesearch:  view
RITS Product ID: 87025
Current FPL Scientist associated with this product
Considine, John M.
Materials Research Engineer

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