scholarly journals Temperature and strain rate effects of jammed granular systems: experiments and modelling

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Piotr Bartkowski ◽  
Grzegorz Suwała ◽  
Robert Zalewski
Keyword(s):  
Finite Element Analysis ◽  
Constitutive Model ◽  
Strain Rate ◽  
Nonlinear Behavior ◽  
Experimental Investigations ◽  
Granular Systems ◽  
Element Analysis ◽  
Strain Rate Effects ◽  
Mechanical Responses ◽  
Rate Effects

AbstractJammed granular systems, also known as vacuum packed particles (VPP), have begun to compete with the well commercialized group of smart structures already widely applied in various fields of industry, mainly in civil and mechanical engineering. However, the engineering applications of VPP are far ahead of the mathematical description of the complex mechanical mechanisms observed in these unconventional structures. As their wider commercialization is hindered by this gap, in the paper the authors consider experimental investigations of granular systems, mainly focusing on the mechanical responses that take place under various temperature and strain rate conditions. To capture the nonlinear behavior of jammed granular systems, a constitutive model constituting an extension of the Johnson–Cook model was developed and is presented. green The extended and modified constitutive model for VPP proposed in the paper could be implemented in the future into a commercial Finite Element Analysis code, making it possible to carry out fast and reliable numerical simulations.

scholarly journals A constitutive model for Ti6Al4V considering the state of stress and strain rate effects

2019 ◽  
Vol 137 ◽  
pp. 103103 ◽  
Author(s):  
Wenyu Cheng ◽  
Jose Outeiro ◽  
Jean-Philippe Costes ◽  
Rachid M'Saoubi ◽  
Habib Karaouni ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
The State ◽  
Stress And Strain ◽  
Strain Rate Effects ◽  
State Of Stress ◽  
Rate Effects ◽  
Stress And Strain Rate

Inclusion of Strain-Rate Effects in Low Velocity Impact Simulation of Laminated Composites

2013 ◽  
Vol 465-466 ◽  
pp. 1395-1399
Author(s):  
Ainullotfi Abdul-Latif ◽  
Mohd Hasrizam Che Man ◽  
S. Mansor
Keyword(s):  
Strain Rate ◽  
Material Properties ◽  
Reaction Force ◽  
Low Velocity Impact ◽  
Static Properties ◽  
Low Velocity ◽  
Element Analysis ◽  
Strain Rate Effects ◽  
Velocity Impact ◽  
Rate Effects

Composite materials are widely used in aircraft, automotive, marine and railway applications and are exposed to impact loads, in particular low velocity impact. As material properties of composites are affected by strain-rate [, finite element analysis (FEA) by using static properties would not predict their impact behaviour accurately. Thus, the objective of this study was to include strain-rate effects in the simulation of composite laminates under low velocity impact. This was achieved using ABAQUS anisotropic damage model (ADM) by taking account of material properties changes as a function of log strain-rate using user-defined ABAQUS/VUSDFLD subroutine Strain-Rate Dependent ADM (SRD ADM). Results obtained from SRD ADM were validated using simple tensile test done by Okoli [. Subsequently a three-point bending impact event of a simple composite laminate beam by a cylindrical steel impactor was simulated using both the original ABAQUS Static ADM and the user-defined SRD ADM, and compared with experimental impact test results done by [. The results show that reductions in errors of predicted maximum impact reaction force (compared to experimental data) were achieved from 29% using Static ADM to 14% using SRD ADM and from 35% using Static ADM to 15% using SRD ADM respectively for impactor speeds of 2 ms-1 and 5 ms-1.

NONLINEAR ANALYSIS OF SHOCK-LOADED REINFORCED CONCRETE STRUCTURES

2004 ◽  
Vol 04 (02) ◽  
pp. 223-236 ◽  
Author(s):  
M. V. DHARANEEPATHY ◽  
N. ANANDAVALLI
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Strain Rate ◽  
Numerical Procedure ◽  
Nonlinear Behavior ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Solid Finite Elements ◽  
Rectangular Slab ◽  
Protective Structures

Extensive use of reinforced concrete to build shock-protective structures calls for adequate analytical expertise to facilitate rational and safe structural designs. Although several researchers have studied these problems, there are still some uncertainties, particularly with regard to strain-rate effects. This paper presents a simplified, but accurate, numerical procedure for modeling the nonlinear behavior of reinforced concrete, using solid finite elements, which include strain-rate effects. The details of the material modeling for anisotropic concrete and isotropic steel are presented. A clamped circular plate subjected to uniformly distributed load and a clamped rectangular slab subjected to jet force are analyzed using 8-noded solid finite elements. Strain-rate effects are considered in the analyses.

Modeling rate effects in undrained loading of sands

2004 ◽  
Vol 41 (2) ◽  
pp. 342-350 ◽  
Author(s):  
N Boukpeti ◽  
Z Mróz ◽  
A Drescher
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Triaxial Compression ◽  
Technical Note ◽  
Strain Rate Effects ◽  
Dependent Behavior ◽  
Static Liquefaction ◽  
Model Response ◽  
Rate Effects ◽  
Undrained Loading

The present technical note extends the previous work by the authors concerned with formulation of a constitutive model of elastoplastic response of sands (Superior sand model) and its application to the analyses of static liquefaction and instability states in triaxial compression and extension occurring in the undrained deformation of saturated granular materials. To account for time-dependent behavior and strain rate effects, an elastic, viscoplastic extension of the model to triaxial compression is proposed. The constitutive equations derived are used to predict the model response in different loading histories. In particular, strain rate and stress rate effects and undrained creep deformation for specified stress components are discussed in detail. Comparison of model predictions with available experimental data also is provided.Key words: saturated sand, constitutive model, elastic–viscoplastic behavior.

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