239 research outputs found
Scaling laws for frictional granular materials confined by constant pressure under oscillatory shear
Herein, we numerically study the rheology of a two-dimensional frictional
granular system confined by constant pressure under oscillatory shear. Several
scaling laws for the storage and loss moduli against the scaled strain
amplitude have been found. The scaling laws in plastic regime for large strain
amplitude can be understood by the angular distributions of the contact force.
The scaling exponents are estimated by considering the physical mechanism.Comment: 13 pages, 18 figure
Dilatancy of frictional granular materials under oscillatory shear with constant pressure
We perform numerical simulations of a two-dimensional frictional granular
system under oscillatory shear confined by constant pressure. We found that the
system undergoes dilatancy as the strain increases. We confirmed that
compaction also takes place at an intermediate strain amplitude for a small
mutual friction coefficient between particles. We also found that compaction
depends on the confinement pressure while dilatancy little depends on the
pressure.Comment: 4 pages, 4 figure
Who Uses Free Trade Agreements?
It is noted that utilization of ASEAN Free Trade Agreements (FTAs) is low by international standards. In order to clarify the reasons for such low utilization, this paper investigates what kinds of Japanese affiliates in ASEAN are more likely to use FTAs in their exporting, by employing unique affiliate-level data. Our findings are as follows. First, the larger the affiliate is, or the more diversified the origins of its procurements, the more likely it is to utilize an FTA scheme in its exporting. Second, affiliates that export actively to countries with higher general tariffs are more likely to use FTAs. Third, there are clear differences in FTA utilization depending affiliates, locations and sectors.
Who Uses FTAs?
It is noted that utilization of AFTA is low by international standards. In order to clarify the
reasons for such low utilization, this paper investigates what kinds of Japanese affiliates in
ASEAN are more likely to use FTAs in their exporting, by employing unique affiliate-level data.
Our findings are as follow. First, the larger the affiliate is, or the more diversified its
procurements’ origins are, the more likely it is to utilize an FTA scheme in its exporting. Second,
affiliates exporting actively to developing countries are more likely to use FTAs than those
exporting to developed countries. Third, there are clear differences in FTA utilization depending
on affiliates’ locations and sectors. These results afford a clue to the reasons for the low FTA
utilization in East Asia.FTA, Micro data, ASEAN, International trade, Regional economic cooperation, International economic integration
Who Uses FTAs?
It is noted that utilization of AFTA is low by international standards. In order to clarify thereasons for such low utilization, this paper investigates what kinds of Japanese affiliates inASEAN are more likely to use FTAs in their exporting, by employing unique affiliate-level data.Our findings are as follow. First, the larger the affiliate is, or the more diversified itsprocurements’ origins are, the more likely it is to utilize an FTA scheme in its exporting. Second,affiliates exporting actively to developing countries are more likely to use FTAs than thoseexporting to developed countries. Third, there are clear differences in FTA utilization dependingon affiliates’ locations and sectors. These results afford a clue to the reasons for the low FTAutilization in East Asia
Eigenvalue analysis of stress-strain curve of two-dimensional amorphous solids of dispersed frictional grains with finite shear strain
The stress-strain curve of two-dimensional frictional dispersed grains
interacting with a harmonic potential without considering the dynamical slip
under a finite strain is determined by using eigenvalue analysis of the Hessian
matrix. After the configuration of grains is obtained, the stress-strain curve
based on the eigenvalue analysis is in almost perfect agreement with that
obtained by the simulation, even if there are plastic deformations caused by
stress avalanches. Unlike the naive expectation, the eigenvalues in our model
do not indicate any precursors to the stress-drop events.Comment: 22 pages, 16 figures. arXiv admin note: text overlap with
arXiv:2207.0663
Theory of rigidity and density of states of two-dimensional amorphous solids of dispersed frictional grains in the linear response regime
Using the Jacobian matrix, we theoretically determine the rigidity of
two-dimensional amorphous solids consisting of frictional grains in the linear
response to an infinitesimal strain, in which we ignore the dynamical friction
caused by the slip processes of contact points. The theoretical rigidity agrees
with that obtained by molecular dynamics simulations. We confirm that the
rigidity is smoothly connected to the value in the frictionless limit. We find
that there are two modes in the density of states for sufficiently small
, which is the ratio of the tangential to normal stiffness.
Rotational modes exist at low frequencies or small eigenvalues, whereas
translational modes exist at high frequencies or large eigenvalues. The
location of the rotational band shifts to the high-frequency region with an
increase in and becomes indistinguishable from the translational
band for large . The rigidity determined by the translational
modes agrees with that obtained by the molecular dynamics simulations, whereas
the contribution of the rotational modes is almost zero for small
.Comment: 10 pages, 15 figure
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