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Study on the Fatigue Properties and Constitutive Model of Siltstone Under the Coupled Action of Dry‒wet Cycles and Cyclic Loads by Zhen Huang; Wei Zhang; Hai Zhang; Jia-Bing Zhang; Xi-lin Lu is a Engineering article available to read on EtoBox.

What is Study on the Fatigue Properties and Constitutive Model of Siltstone Under the Coupled Action of Dry‒wet Cycles and Cyclic Loads about?

To study the fatigue properties of siltstone under the coupled action of dry‒wet cycles and cyclic loads, uniaxial fatigue tests were conducted on rock samples. The results show that the fatigue stress‒strain curve of siltstone exhibits a "sparse-dense-sparse" characteristic. The trend of the variation in peak strain can be divided into three stages: the initial stage, the isokinetic stage, and the acceleration stage. With an increasing number of dry‒wet cycles, upper stress limit, or stress amplitude or with a decreasing loading frequency, a rock sample will have a more significant plastic deformation during the failure process, and its failure life will be shortened. Additionally, to construct a constitutive equation under the coupled action of dry‒wet cycles and cyclic loads, a fractional-order viscoelastoplastic fatigue model was established by introducing a Scott-Blair fractional-order element to replace the Newton damper in the Nishihara model. The cyclic loads were decomposed into static loads and cyclic loads with an average stress of zero. Based on the theory of viscoelastic mechanics, energy storage compliance and energy consumption compliance were introduced, and a compl

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Author

Zhen Huang; Wei Zhang; Hai Zhang; Jia-Bing Zhang; Xi-lin Lu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)