Binary Blends of Monodisperse Polymers: Use of a Kinetic Network Model for Nonlinear Shear Stress Predictions in Entangled Polymer Fluids

1983 ◽  
Vol 27 (1) ◽  
pp. 7-35 ◽  
Author(s):  
Tony Y. Liu ◽  
David S. Soong ◽  
Michael C. Williams
Keyword(s):  
Shear Stress ◽  
Network Model ◽  
Binary Blends ◽  
Polymer Fluids ◽  
Monodisperse Polymers ◽  
Entangled Polymer ◽  
Nonlinear Shear

Nonuniform Temperature Distribution in Adiabatic Shear Band Using Measured Shear Stress-Shear Strain Curve in Torsion of Thin-Walled Tube Aluminium Alloy Specimen and Gradient-Dependent Plasticity

2006 ◽  
Vol 519-521 ◽  
pp. 865-870 ◽  
Author(s):  
X.B. Wang
Keyword(s):  
Shear Stress ◽  
Strain Rate ◽  
Shear Strain ◽  
Temperature Rise ◽  
Strain Curve ◽  
Local Temperature ◽  
Dependent Plasticity ◽  
Peak Shear Stress ◽  
Nonlinear Shear ◽  
Shear Strain Curve

Gradient-dependent plasticity where a characteristic length is involved to consider the microstructural effect (interactions and interplaying among microstructures due to the heterogeneous texture) and the measured nonlinear shear stress-shear strain curves for different loading strain rates are used to calculate the distribution of local temperature rise in adiabatic shear band (ASB) for aluminum-lithium alloy specimen of thin-walled tube in dynamic torsion test. ASB is assumed to initiate just at peak shear stress in the specimen. The temperature rise in ASB is decomposed into the uniform temperature rise in strain-hardening stage and the nonuniform temperature rise in strain-softening stage. The former depends on the measured nonlinear shear stress-shear strain curve prior to the peak, the density, the work to heat conversion factor and the heat capacity. The latter is related to the softening branch of the measured nonlinear shear stress-shear strain curve, the internal length parameter and the physical parameters. For binary Al-Li alloy, the predicted maximum temperatures in ASB are 413K at strain rate of 2000s-1 and 433K at strain rate of 2600s-1. These peak temperatures are lower than the recrystallization and phase transformation temperatures. Higher loading strain rate results in higher pre-peak and post-peak temperature rises, steeper profile of local temperature and higher peak local temperature in ASB. These predictions qualitatively agree with the previously analytical solution for ductile metal exhibiting linear strain-softening behavior beyond the peak shear stress based on gradient-dependent plasticity.

The influence of nonlinear shear stress on partially averaged Navier-Stokes (PANS) method

2017 ◽  
Vol 29 (3) ◽  
pp. 479-484 ◽  
Author(s):  
Jin-tao Liu ◽  
Peng-cheng Guo ◽  
Tie-jun Chen ◽  
Yu-lin Wu
Keyword(s):  
Shear Stress ◽  
Navier Stokes ◽  
Nonlinear Shear

Time dependent nonlinear shear stress effects in simple liquids: A molecular dynamics study

1980 ◽  
Vol 73 (8) ◽  
pp. 3987-3996 ◽  
Author(s):  
D. M. Heyes ◽  
J. J. Kim ◽  
C. J. Montrose ◽  
T. A. Litovitz
Keyword(s):  
Molecular Dynamics ◽  
Shear Stress ◽  
Time Dependent ◽  
Simple Liquids ◽  
Stress Effects ◽  
Nonlinear Shear

Nonlinear shear stress reduction factor (rd) for assessment of liquefaction potential in Christchurch Central Business District

2014 ◽  
Vol 47 (1) ◽  
pp. 1-14
Author(s):  
James N. Dismuke
Keyword(s):  
Shear Stress ◽  
Stress Reduction ◽  
Site Response ◽  
Ground Motions ◽  
Limit State ◽  
Central Business District ◽  
Reduction Factor ◽  
Response Models ◽  
Business District ◽  
Nonlinear Shear

Simplified procedures for evaluating liquefaction triggering potential use the nonlinear shear stress reduction factor, rd, to estimate the peak earthquake-induced cyclic shear stress within the soil strata. Previous studies have derived rd by considering the response of representative ground profiles subjected to input ground motions with a range of ground motion characteristics. In this study, site–specific rd for serviceability limit state (SLS) and ultimate limit state (ULS) design ground motions are developed using site response models of the Christchurch Central Business District (CBD). The site response models are generated for typical geologic conditions of Christchurch CBD with shear wave velocity, Vs, profiles developed from the results of multichannel analysis of surface waves (MASW) surveys conducted across Christchurch CBD. A total of 528 simulations were conducted using 1D nonlinear time domain site response analyses using a suite of input ground motions that are representative of controlling ground motion scenarios for seismic hazard of Christchurch. The results of the ground response analyses are used to determine Christchurch CBD-specific rd relationships for liquefaction triggering assessments. The proposed relationships provide a better estimate of the cyclic stress ratios induced below Christchurch CBD when subjected to design SLS and ULS ground motions as compared to typical practice using generic liquefaction assessment methodologies.

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