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Long-Term Cyclic Loading Impact on the Creep Deformation Mechanism in Cohesive Materials

Authors
  • Głuchowski, Andrzej
  • Sas, Wojciech
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Sep 03, 2020
Volume
13
Issue
17
Identifiers
DOI: 10.3390/ma13173907
PMID: 32899404
PMCID: PMC7503864
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Green

Abstract

Long-term cyclic loading is observed in a wide range of human activities, as well as in nature, such as in the case of ocean waves. Cyclic loading can lead to ratcheting which is defined as progressive accumulation of plastic deformation in a material. Long-term cyclic loading causes a time effect (creep), which is a secondary compression effect. In this article, we conducted 15 triaxial tests on four types of cohesive materials in undrained conditions to evaluate the damage and failure mechanism. To characterize the strain and pore pressure development, we modified the Yanbu resistance concept. On the basis of the static creep tests, we concluded that the stress paths for undrained creep behavior have to take into account the pore pressure developed during long-term cyclic loading. Pore pressure build-up and plastic strain accumulation during long-term cyclic loading are dependent on the number of loading cycles. Finally, we proposed the failure criterion, which was based on the Modified Cam-Clay constitutive model.

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