scholarly journals Origin of critical strain amplitude in periodically sheared suspensions

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Phong Pham ◽  
Jason E. Butler ◽  
Bloen Metzger
Keyword(s):  
Strain Amplitude ◽  
Critical Strain ◽  
Sheared Suspensions

Microstructures and Damping Capacity of Mg-6Zn-0.5Zr Alloy

2012 ◽  
Vol 557-559 ◽  
pp. 1624-1628 ◽  
Author(s):  
Xian Lan Liu ◽  
Chu Ming Liu ◽  
Wen Yu Zhang ◽  
Jian Hua Luo ◽  
Su Min Zeng
Keyword(s):  
Strain Amplitude ◽  
Critical Strain ◽  
Damping Capacity ◽  
Damping Properties ◽  
Dynamic Mechanical Analyzer ◽  
Dynamic Mechanical ◽  
Experimental Strain ◽  
Damping Peak ◽  
Peak Value

The dynamic mechanical analyzer (DMA) was applied to investigate the damping properties of Mg-6Zn-0.6Zr alloys. The results show that the as-cast Mg-6Zn-0.6Zr alloy exhibits higher strain amplitude independent damping performance than that of as-homogenized. The strain amplitude dependent damping of the as-homogenized has the best damping performance with the strain amplitude from 3×10-5 to 6×10-4, and the as-extruded is the lowest. When the strain amplitude exceeded 6×10-4, the as-extruded has the best damping capacity all the time within the experimental strain amplitude, and all the alloys reach the high damping capacity. Two critical strain amplitude points were detected in the alloy as-extruded and as-homogenized. The damping peak value is 0.0192 with the strain amplitude of 1.5×10-3 presented in the alloy as-extruded.

FATIGUE PERFORMANCE OF CLAY-EPOXY NANOCOMPOSITES

2005 ◽  
Vol 04 (04) ◽  
pp. 501-507 ◽  
Author(s):  
ARIADNE JUWONO ◽  
GRAHAM EDWARD
Keyword(s):  
Fatigue Life ◽  
Epoxy Resin ◽  
Failure Mechanism ◽  
Strain Amplitude ◽  
Polymer Matrix ◽  
Critical Strain ◽  
Layered Silicates ◽  
Fatigue Properties ◽  
Curing Agent ◽  
Xrd And Tem

This paper presents an investigation of the possibility of improving the fatigue properties of an epoxy resin through dispersion of modified layered silicates within the polymer matrix. Montmorillonite-epoxy nancocomposites were successfully synthesized with a commercially available 1-Methylimidazole curing agent. The morphology of these materials was investigated by XRD and TEM. The findings demonstrated a pattern of clay morphology typically found in nanocomposite systems. Four point loading measurements showed an increase in modulus for 2.5 wt% and 10 wt% clay contents when compared to the unfilled epoxy, whereas the moduli showed a decrease for 5 wt% and 7.5 wt% clay contents. This behavior is typical for most particulate-filled systems. Fracture surfaces were examined using an E-SEM. The failure mechanism of the nanocomposites varied from that of the unfilled epoxy. Below a critical strain amplitude, the fatigue life of the filled epoxy improved significantly compared to that of the unfilled epoxy. In conclusions, the addition of silicates changes the fatigue failure mechanism and improves significantly the fatigue life.

Atomistic simulation of the uniaxial compression of black phosphorene nanotubes

2018 ◽  
Author(s):  
Van-Trang Nguyen ◽  
Minh-Quy Le
Keyword(s):  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Uniaxial Compression ◽  
Critical Stress ◽  
Atomistic Simulation ◽  
Critical Strain ◽  
Bond Breaking ◽  
Black Phosphorene ◽  
Weber Potential

We study through molecular dynamics finite element method with Stillinger-Weber potential the uniaxial compression of (0, 24) armchair and (31, 0) zigzag black phosphorene nanotubes with approximately equal diameters. Young's modulus, critical stress and critical strain are estimated with various tube lengths. It is found that under uniaxial compression the (0, 24) armchair black phosphorene nanotube buckles, whereas the failure of the (31, 0) zigzag one is caused by local bond breaking near the boundary.

Stability Analysis of the Nanjung Water Diversion Twin Tunnels based on Convergence Measurement

2019 ◽  
Vol 1 (1) ◽  
pp. 49-60
Author(s):  
Simon Heru Prassetyo ◽  
Ganda Marihot Simangunsong ◽  
Ridho Kresna Wattimena ◽  
Made Astawa Rai ◽  
Irwandy Arif ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Convergence Rate ◽  
Critical Strain ◽  
Convergence Rates ◽  
Strain Analysis ◽  
Water Diversion ◽  
Tunnel Face ◽  
Tunnel Stability ◽  
The Stability ◽  
Twin Tunnels

This paper focuses on the stability analysis of the Nanjung Water Diversion Twin Tunnels using convergence measurement. The Nanjung Tunnel is horseshoe-shaped in cross-section, 10.2 m x 9.2 m in dimension, and 230 m in length. The location of the tunnel is in Curug Jompong, Margaasih Subdistrict, Bandung. Convergence monitoring was done for 144 days between February 18 and July 11, 2019. The results of the convergence measurement were recorded and plotted into the curves of convergence vs. day and convergence vs. distance from tunnel face. From these plots, the continuity of the convergence and the convergence rate in the tunnel roof and wall were then analyzed. The convergence rates from each tunnel were also compared to empirical values to determine the level of tunnel stability. In general, the trend of convergence rate shows that the Nanjung Tunnel is stable without any indication of instability. Although there was a spike in the convergence rate at several STA in the measured span, that spike was not replicated by the convergence rate in the other measured spans and it was not continuous. The stability of the Nanjung Tunnel is also confirmed from the critical strain analysis, in which most of the STA measured have strain magnitudes located below the critical strain line and are less than 1%.

Critical Strain-Induced Photoresponse in Folded Graphene Superlattices

2021 ◽  
Author(s):  
Ruo-Xuan Sun ◽  
Qin-Qin Guo ◽  
Chang-Fu Huo ◽  
Xiao-Qing Yan ◽  
Zhi-Bo Liu ◽  
...  
Keyword(s):  
Critical Strain
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