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Packing fraction effect on dynamic creep deformation of granular materials.

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Title: Packing fraction effect on dynamic creep deformation of granular materials.
Authors: Tong, Lihong1,2 (AUTHOR), Fu, Li1 (AUTHOR), Wu, Bingni1 (AUTHOR), Xu, Changjie1,2,3 (AUTHOR) xucj@zju.edu.cn, Lim, C. W.4 (AUTHOR)
Source: Acta Geotechnica. May2025, Vol. 20 Issue 5, p2135-2144. 10p.
Subjects: Dynamic testing of materials, Creep testing, Creep (Materials), Strains & stresses (Mechanics), Rheology
Abstract: The rheological properties and creep dynamical behavior of the granular materials are significantly influenced by the packing fraction. The granular materials with a low packing fraction tend to transit from a solid-like to liquid-like state. The strain evolution and deformation characteristics of granular materials under different packing fractions are investigated by triaxial creep tests. The result indicates that a critical packing fraction exists for the granular system under specific external loading conditions, below which the system will be broken in a short period of time. Conversely, for packing fraction that exceeds the critical value, the granular material system exhibits logarithmic creep dynamics and eventually reaches a steady state. To characterize the creep behaviors of granular materials under dynamic loading, a state evolution model is introduced. The model is verified by combining the theoretical predictions with the experimental observations. Furthermore, parametric analysis is also implemented based on the introduced model. The results demonstrate that the model can capture the fundamental spatiotemporal evolution characteristics of granular materials which are subjected to dynamic loading conditions. [ABSTRACT FROM AUTHOR]
Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: The rheological properties and creep dynamical behavior of the granular materials are significantly influenced by the packing fraction. The granular materials with a low packing fraction tend to transit from a solid-like to liquid-like state. The strain evolution and deformation characteristics of granular materials under different packing fractions are investigated by triaxial creep tests. The result indicates that a critical packing fraction exists for the granular system under specific external loading conditions, below which the system will be broken in a short period of time. Conversely, for packing fraction that exceeds the critical value, the granular material system exhibits logarithmic creep dynamics and eventually reaches a steady state. To characterize the creep behaviors of granular materials under dynamic loading, a state evolution model is introduced. The model is verified by combining the theoretical predictions with the experimental observations. Furthermore, parametric analysis is also implemented based on the introduced model. The results demonstrate that the model can capture the fundamental spatiotemporal evolution characteristics of granular materials which are subjected to dynamic loading conditions. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11440-024-02459-w
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        Text: English
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              Text: May2025
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