Elastic-plastic transition induced by small-amplitude cyclic shearing of shear-jammed granular solids
ORAL
Abstract
We show experimentally that small amplitude cyclic shear has a dramatic effect on shear jammed granular packings. A shear-jammed state generated by forward shear can relax to an unjammed state or an elastically stable state, depending on the initial shear strain γi and the amplitude of the cyclic shear δγ. For γi less than a threshold value γc, cyclic shear on the order of 5% of γc causes the stress to relax to zero, and strobed particle dynamics is diffusive. The number of cycles needed to reach the unjammed state grows exponentially with increasing γi. For γi larger than γc, we see reversible elastic states lasting for thousands of cycles. The value of γc depends on both packing fraction and δγ. The long-lived elastic states have much smaller pressures than the initial shear-jammed packings but exhibit much stiffer responses to incremental shear strain.
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Presenters
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Yiqiu Zhao
Duke University
Authors
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Yiqiu Zhao
Duke University
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Yuchen Zhao
Duke University
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Dong Wang
Mechanical Engineering, Yale University, Yale University
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Hu Zheng
Department of Geotechnical Engineering, Tongji University, Tongji University, Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai, China, Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, China
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Bulbul Chakraborty
Brandeis University, Brandeis Univ
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Ryan Kozlowski
Department of Physics, Duke University, Duke University, Department of Physics, Duke University, USA
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Joshua Socolar
Department of Physics, Duke University, Duke University, Department of Physics, Duke University, USA