scholarly journals Semi-Automated Procedure to Estimate Nonlinear Kinematic Hardening Model to Simulate the Nonlinear Dynamic Properties of Soil and Rock

2021 ◽  
Vol 11 (18) ◽  
pp. 8611
Author(s):  
Van-Linh Ngo ◽  
Changho Lee ◽  
Eun-haeng Lee ◽  
Jae-Min Kim
Keyword(s):  
Dynamic Properties ◽  
Kinematic Hardening ◽  
Back Stress ◽  
Good Match ◽  
Nonlinear Properties ◽  
Backbone Curves ◽  
Nonlinear Dynamic Properties ◽  
Strain Dependent ◽  
Fitting Parameters ◽  
Properties Of Soil

The strain-dependent nonlinear properties of ground materials, such as shear modulus degradation (G/Gmax) and damping, are of significant importance in seismic-related analyses. However, the ABAQUS program lacks a comprehensive procedure to estimate parameters for a built-in model. In this study, a nonlinear kinematic hardening (NKH) model with three back-stress values was used, which allows better fitting to the backbone curves compared to the simplified nonlinear kinematic hardening (SNKH) model previously proposed. Instead of modeling in ABAQUS, a semi-automated procedure was implemented in MATLAB, which can predict shear stress–shear strain hysteretic loops, to find the fitting parameters to the target G/Gmax and/or damping curves. The procedure was applied for three soil and two rock samples, and the results indicate a good match between model and target backbone curves, which proves the application of the procedure and the NKH model in simulating the nonlinear properties of ground materials.

Nonlinear Dynamic Properties of the Pancreas and Liver

1973 ◽  
Vol 6 (4) ◽  
pp. 503-508
Author(s):  
Richard N. Bergman ◽  
Richard J. Bucolo
Keyword(s):  
Nonlinear Dynamic ◽  
Dynamic Properties ◽  
Nonlinear Dynamic Properties

Numerical Evaluation of Crashworthiness of Automotive Sheets

2007 ◽  
Vol 345-346 ◽  
pp. 1537-1540
Author(s):  
Han Sun Ryou ◽  
Myoung Gyu Lee ◽  
Chong Min Kim ◽  
Kwan Soo Chung
Keyword(s):  
Crystal Structures ◽  
Yield Surface ◽  
Numerical Evaluation ◽  
Kinematic Hardening ◽  
Sheet Thickness ◽  
Back Stress ◽  
Yield Function ◽  
Chaboche Model ◽  
Simulation Results ◽  
Function Shape

Crash simulations were performed for automotive sheets. To understand the influence of crystal structures in sheet materials on crashworthiness, the effect of the yield function shape was studied by adopting the recently developed non-quadratic anisotropic yield surface, Yld2004-18p. The effect of the back-stress was also investigated by comparing simulation results obtained for the isotropic, kinematic and combined isotropic-kinematic hardening laws based on the modified Chaboche model. In addition, the effects of anisotropy and sheet thickness on crashworthiness were evaluated.

scholarly journals Nonlinear Dynamics of Exclusive Excited-State Emission Quantum Dot Lasers Under Optical Injection

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 58 ◽  
Author(s):  
Zai-Fu Jiang ◽  
Zheng-Mao Wu ◽  
Elumalai Jayaprasath ◽  
Wen-Yan Yang ◽  
Chun-Xia Hu ◽  
...  
Keyword(s):  
Excited State ◽  
Quantum Dot ◽  
Dynamic Properties ◽  
Optical Injection ◽  
Permutation Entropy ◽  
Frequency Detuning ◽  
Nonlinear Dynamical ◽  
Injection Coefficient ◽  
Nonlinear Dynamic Properties ◽  
Linewidth Enhancement

We numerically investigate the nonlinear dynamic properties of an exclusive excited-state (ES) emission quantum dot (QD) laser under optical injection. The results show that, under suitable injection parameters, the ES-QD laser can exhibit rich nonlinear dynamical behaviors, such as injection locking (IL), period one (P1), period two (P2), multi-period (MP), and chaotic pulsation (CP). Through mapping these dynamic states in the parameter space of the frequency detuning and the injection coefficient, it can be found that the IL occupies a wide region and the dynamic evolution routes appear in multiple forms. Via permutation entropy (PE) calculation to quantify the complexity of the CP state, the parameter range for acquiring the chaos with high complexity can be determined. Moreover, the influence of the linewidth enhancement factor (LEF) on the dynamical state of the ES-QD laser is analyzed. With the increase of the LEF value, the chaotic area shrinks (expands) in the negative (positive) frequency detuning region, and the IL region gradually shifts towards the negative frequency detuning.

scholarly journals Dynamic Properties of Clean Sand Modified with Granulated Rubber

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Dervis Volkan Okur ◽  
Seyfettin Umut Umu
Keyword(s):  
Shear Modulus ◽  
Dynamic Characteristics ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Relative Size ◽  
Cyclic Behavior ◽  
Damping Capacity ◽  
Resonant Column ◽  
Strain Dependent

Waste automobile tires are used as additives or replacements instead of traditional materials in civil engineering works. In geotechnical engineering, tires are shredded to certain sizes and mixed with soil, especially used as backfill material behind retaining walls or fill material for roadway embankments. Compared to soil, rubber has high damping capacity and low shear modulus. Therefore, it requires the determination of the dynamic characteristics of rubber/soil mixtures. In this paper, the cyclic behavior of recycled tire rubber and clean sand was studied, considering the effects of the amount and particle size of the rubber and confining stresses. A total of 40 stress-controlled tests were performed on an integrated resonant column and dynamic torsional shear system. The effects of the relative size and proportion of the rubber on the dynamic characteristics of the mixtures are discussed. The dynamic properties, such as the maximum shear modulus, strain-dependent shear modulus, and damping ratio, are examined. For practical purposes, simple empirical relationships were formulated to estimate the maximum shear modulus and the damping ratio. The change in the shear modulus and damping ratio with respect to shear strain with 5% of rubber within the mixture was found to be close to the behavior of clean sand.

scholarly journals Effect of carbonation on the linear and nonlinear dynamic properties of cement-based materials

2015 ◽  
Vol 55 (1) ◽  
pp. 011004 ◽  
Author(s):  
Jesus N. Eiras ◽  
Tribikram Kundu ◽  
John S. Popovics ◽  
José Monzó ◽  
María V. Borrachero ◽  
...  
Keyword(s):  
Nonlinear Dynamic ◽  
Dynamic Properties ◽  
Cement Based Materials ◽  
Linear And Nonlinear ◽  
Nonlinear Dynamic Properties

Dynamic properties of soil organic carbon in Hunan's Forests

2015 ◽  
Vol 35 (13) ◽  
Author(s):  
李斌 LI Bin ◽  
方晰 FANG Xi ◽  
李岩 LI Yan ◽  
项文化 XIANG Wenhua ◽  
田大伦 TIAN Dalun ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Dynamic Properties ◽  
Properties Of Soil ◽  
Dynamic Properties Of Soil

Corotational Rates for Kinematic Hardening at Large Plastic Deformations

1983 ◽  
Vol 50 (3) ◽  
pp. 561-565 ◽  
Author(s):  
Y. F. Dafalias
Keyword(s):  
Simple Shear ◽  
Plastic Material ◽  
Kinematic Hardening ◽  
Back Stress ◽  
Analytical Form ◽  
Rigid Plastic ◽  
Plastic Deformations ◽  
Novel Approach ◽  
Rigid Plastic Material ◽  
Large Plastic Deformations

To illustate the effect of the choice of corotational rates at large plastic deformations, expressions for the stresses developing in large simple shear are obtained in closed analytical form under the assumptions of a rigid-plastic material response and a Mises type isotropically and kinematically hardening constitutive model for two different corotational rates applied to the stress and the back-stress tensors. The observed difference in the simple shear response and the relative merits of the foregoing and other corotational rates are discussed, and a novel approach is proposed based on Mandel’ work and the representation theorem for isotropic second-order antisymmetric tensor valued functions.

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