Constructing a Theory for Amorphous Solids

Gado, Emanuela Del

doi:10.1103/physics.11.88

Cited by 2 publications

(1 citation statement)

References 44 publications

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“…2b) and also in dry granular packings 11 . Indeed, even in the absence of an external load, compacted granular materials always have internal stresses which build up from friction between the grains (i.e., interlock) and from constraints imposed by the material boundary 36,37 .…”

Section: Discussion and Modellingmentioning

confidence: 99%

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

et al. 2019

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We present an experimental investigation of shear elastic wave propagation along the surface of a dense granular suspension. Using an ultrafast ultrasound scanner, we monitor the softening of the shear wave velocity inside the optically opaque medium as the driving amplitude increases. For such nonlinear behavior two regimes are found: in the first regime, we observe a significant shear modulus weakening, but without visible grain rearrangements.In the second regime, there is a clear grain rearrangement accompanied by a modulus decrease up to 88%. A friction model is proposed to describe the interplay between nonlinear elasticity and plasticity, which highlights the crucial effect of contact slipping before contact breaking. Investigation of these nonlinear shear waves may bridge the gap between two disjoint approaches for describing the dynamics near unjamming: linear elastic soft modes and nonlinear collisional shock.

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Section: Discussion and Modellingmentioning

confidence: 99%

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

et al. 2019

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Femtosecond Laser Trimming with Simultaneous Nanostructuring to Fine Piercing Punch to Electrical Amorphous Steel Sheets

et al. 2021

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A CVD (Chemical Vapor Deposition) diamond coated tungsten carbide (WC) and cobalt (Co) sintered alloy punch was trimmed by the femtosecond laser machining to sharpen its edge with about 2 μm and to simultaneously make nanostructuring to its side surface. In addition to the sharpened edge, its edge profile was formed to be homogeneous enough to reduce the damage layer width by piercing the electrical amorphous steel sheet stack. Each brittle sheet in the stacked work was damaged to have three kinds of defects by piercing; e.g., the droop-like cracking in the thickness and at the vicinity of hole, the wrinkling in peak-to-valley with partial cracking on the peaks, and the circumferential cracking. When using the WC (Co) punch with the inhomogeneous edge profile in the sharpened edge width, these three damages were induced into each sheet and the maximum damage width exceeded 80 μm. When using the punch with the sharpened edge and homogeneous edge profile, the wrinkling mode was saved and the total affected layer width was significantly reduced to less than 20 μm. Through the precise embossing experiments, this effect of punch edge profile condition to the induced damages was discussed with a statement on the nanostructuring effect on the reduction of damaged width in electrical amorphous steel sheets. The developed tool with the sharpened edge and homogenous edge condition contributes to the realization of a low iron loss motor with a reduced affected layer width.

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Constructing a Theory for Amorphous Solids

Cited by 2 publications

References 44 publications

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

Drastic slowdown of the Rayleigh-like wave in unjammed granular suspensions

Femtosecond Laser Trimming with Simultaneous Nanostructuring to Fine Piercing Punch to Electrical Amorphous Steel Sheets

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