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http://dx.doi.org/10.14481/jkges.2017.18.3.25

Showing Morphological Evolution of the Strain Response Envelope of Clay with Fourier Descriptor Analysis  

Kim, Taesik (Department of Civil Engineering, Hongik University)
Jung, Young-Hoon (Department of Civil Engineering, Kyung Hee University)
Publication Information
Journal of the Korean GEO-environmental Society / v.18, no.3, 2017 , pp. 25-30 More about this Journal
Abstract
This paper introduces a novel method to quantify the morphological evolution of the strain response envelope. The strain response envelope is defined as an image in strain increment space corresponding to the unit stress input in stress space. Based on the shape of strain response envelopes, the deformation characteristics of soils can be described using the framework of elastic-plastic theory. Fourier descriptor analysis was used to investigate the morphological characteristics of strain response envelopes. The numerical results show that when the stress input remains in the initial yield surface the Fourier descriptors remain constant. Once the stress input crosses the initial yield surface, every descriptors deals in this study change. Numerical and experimental results of this study show that clear yielding response is only found in natural block samples. Among the Fourier descriptors, the descriptor called as asymmetry is the best for detecting the yield and is minimally sensitive to the number of input stress paths.
Keywords
Strain response envelope; Fourier descriptor; Fourier transform; Morphology;
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