scholarly journals Selected Aspects Of Modelling Of Non-Linear Behaviour Of Concrete During Tensile Test Using Multiplas Library

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Filip Hokeš
Keyword(s):  
Tensile Test ◽  
Numerical Simulations ◽  
Material Model ◽  
Tension Test ◽  
Elastoplastic Material ◽  
Model Library ◽  
Non Linear ◽  
Linear Behaviour ◽  
The Subject ◽  
Ansys System

Abstract The subject of this paper is to describe some of the aspects manifesting in the use of the elastoplastic material model library multiPlas, which was developed to support non-linear computations in the ANSYS system. The text focuses on the analysis of numerical simulations of a virtual tension test in several case studies, thereby the text endeavours to describe the problems connected with modelling non-linear behaviour of concrete in a tensile area.

scholarly journals The damage analysis of the reinforced concrete beam and the prestressed reinforced concrete beam

2018 ◽  
Vol 157 ◽  
pp. 02055
Author(s):  
Milan Vaško ◽  
Marián Handrik ◽  
Matej Rác ◽  
Vladislav Baniari ◽  
Ján Kortiš ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Material Model ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Elastoplastic Material ◽  
Damage Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Non Linear

The paper deals with the finite-element analysis of damage in reinforced concrete beam and prestressed reinforced concrete beam. The steel reinforcement is modeled using non-linear rebar elements and an elastoplastic model of the reinforcement is considered. The initial prestress is defined in the ropes that are used to create the prestressed reinforced concrete beam. These ropes are also modeled using non-linear rebar elements and the elastoplastic material model. Created computational model allows the damage modeling of the reinforced and pre-stressed reinforced concrete beams under static loading.

scholarly journals The Influence of Material Model of the Polyurethane Elastomer on the FEM Calculations Quality for the Various Modes of Loading

2017 ◽  
Vol 62 (2) ◽  
pp. 523-530
Author(s):  
S. Kut ◽  
G. Ryzińska ◽  
B. Niedziałek
Keyword(s):  
Tensile Test ◽  
Uniaxial Tension ◽  
Material Model ◽  
Load Cycle ◽  
Tension Test ◽  
Bending Test ◽  
Strain Characteristic ◽  
Uniaxial Tension Test ◽  
Elastomeric Materials ◽  
Yeoh Model

AbstractThe paper presents research to verify the effectiveness of nine selected material models of elastomeric materials based on uniaxial tension test. Basing on the cyclic uniaxial tension test of elastomers sample, the stress-strain characteristic for the 18th load cycle was prepared. On the basis of the obtained characteristic, the values of material constants were calculated for the studied models (Neo-Hookean, Mooney with two and three constants, Signorini, Yeoh, Ogden, Arruda-Boyce, Gent and Marlow) and simulation of tensile, upsetting and bending processes was performed with the usage of the software MARC/Mentat. The effectiveness of the selected models was determined based on a comparison of results obtained in the experimental tensile test, upsetting test and bending test of an elastomeric samples with the results of numerical FEM calculations for each models. The research has shown that, for modeling of the elastomeric cylinder upsetting in the range of deformation of 62%, the best results with the comparison of the experiment were obtained by using the Yeoh model. In the bending process none of the analyzed models indicate a high convergence of results from an experiment. Analyzing the characteristics of the experimental and numerical tensile test it can be seen that in the entire range of punch movement (0 to 55 mm), models Signorini, Marlow, Ogden(N3) and Mooney(3) give the best results.

Friction Mechanism of Tread Blocks on Snow Surfaces

1997 ◽  
Vol 25 (4) ◽  
pp. 245-264 ◽  
Author(s):  
R. Mundl ◽  
G. Meschke ◽  
W. Liederer
Keyword(s):  
Numerical Simulations ◽  
Material Model ◽  
Experimental Investigations ◽  
Model Parameters ◽  
Elastoplastic Material ◽  
Compression Tests ◽  
The Finite Element Method ◽  
Friction Mechanism ◽  
Insight Into ◽  
Rubber Block

Abstract Evaluation of tread pattern designs with respect to performance of winter tires on snow is still predominantly based on empirical knowledge. To gain greater insight into the complex interaction between the elastic tread block and the inelastically deforming snow, numerical simulations by means of the Finite Element Method (FEM) were carried out in conjunction with experimental investigations. An elastoplastic material model for snow was developed. Calibration of the model parameters is based on shear and compression tests conducted on specimens made of natural and artificial snow. Good correlation is obtained between results from laboratory experiments and from numerical simulations with respect to the deformations and the frictional behavior of a single rubber block sliding on snow.

scholarly journals Non Linear Behaviour of Oil Film Bearings and its Relevance in Force Identification Procedures

1997 ◽  
Author(s):  
Nicolò Bachschmid ◽  
Riccardo Dellupi
Keyword(s):  
Steady State ◽  
Numerical Simulations ◽  
Identification Procedure ◽  
Oil Film ◽  
Unbalanced Rotor ◽  
Non Linear ◽  
Linear Behaviour ◽  
Exciting Forces ◽  
Linearized Model ◽  
Accuracy Of Results

The main differences in the calculated behaviour of an unbalanced rotor on two-lobe oil film bearings, in terms of mean statical position, 1 × rev. and 2 × rev. components in steady-state conditions, between the results obtained by means of the linearized and the non linear oil film models are shown. The errors introduced by the linearized model are not negligible and can affect significantly the accuracy of results of numerical simulations. This may be unacceptable if one uses the measured vibrations in the bearings for identifying the exciting forces on the rotor in a model based diagnostic approach. Therefore a method is presented which utilises the linear model of the rotor and the non linear oil-film forces in the identification procedure.

Concrete Modeling for Extreme Wave Slam Events

2017 ◽  
Author(s):  
Kasper Wåsjø ◽  
Terje P. Stavang ◽  
Tore H. Søreide
Keyword(s):  
Time Domain ◽  
Linear Time ◽  
Limit State ◽  
Material Model ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Capacity Control ◽  
Extreme Wave ◽  
Conventional Design ◽  
Non Linear

Experience from model tests has initiated a growing attention towards extreme wave slam as a critical load situation for offshore large volume structures. Most of the problem is related to the local slam pressure, which may go up to several MPa’s for 100-year and 10 000-year waves. The paper deals with modeling techniques for marine concrete structures under extreme slam loading from waves where dynamic effects together with material softening play a major role for the response. Different analysis approaches for ultimate limit state (ULS) and accidental limit state (ALS) controls are discussed in view of reliability philosophy as basis for conventional design approach. The present paper is devoted to the local impact scenario and the alternative approaches for response and capacity control involving non-linear time domain analyses. Conventional design schemes as based on linear elastic models for response calculation together with code specified capacity control often come out more conservative than non-linear approach. The paper demonstrates by case studies how softening of the structure in general reduces the response in terms of section forces. A key issue when going from conventional linear approaches into non-linear techniques is to still keep an acceptable reliability level on the capacity control. Load and material factors are normally based on structures with limited non-linearity where linear response modeling is representative. Implementing non-linear material model in time domain analysis has a major challenge in limiting the sensitivity in response and capacity calculation. The paper demonstrates the way material model of concrete affects the section forces to go into local capacity control, and concludes on needed sensitivity analyses. Practical approaches on the concrete slam problem together with resulting utilizations from the control are demonstrated. The full non-linear technique by response and capacity control in one analysis is also handled, using average material parameters and justifying safety factors for the effect of implementing characteristic lower strength of concrete in the capacity. The paper ends up in a recommendation on non-linear time domain analysis procedure for typically slam problems. A discussion is also given on applicable design codes with attention to non-linear analysis.

Non-linear behaviour and failure mechanism of bamboo poles in bending

2021 ◽  
Vol 305 ◽  
pp. 124747
Author(s):  
Rodolfo Lorenzo ◽  
Leonel Mimendi ◽  
Dong Yang ◽  
Haitao Li ◽  
Theodora Mouka ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Non Linear ◽  
Linear Behaviour

A Constitutive Model for Jointed Rock Mass With Orthogonal Sets of Joints

1989 ◽  
Vol 56 (1) ◽  
pp. 25-32 ◽  
Author(s):  
E. P. Chen
Keyword(s):  
Constitutive Model ◽  
Material Model ◽  
Jointed Rock ◽  
Rate Equations ◽  
Strain Partitioning ◽  
Additional Material ◽  
The Subject ◽  
Nonlinear Normal ◽  
Elastic Rock ◽  
The Continuum

The development and numerical implementation of a constitutive model for jointed rock media is the subject of investigation in this paper. The constitutive model is based on the continuum assumption of strain-partitioning among the elastic rock matrix and joint sets with nonlinear normal and shear responses. Rate equations for the stress-strain response of the jointed media have been formulated. A numerical incremental solution scheme to these equations has been developed. It has been implemented into the finite element code JAC as an additional material model. Several sample problems have been solved for demonstration purposes. Interpretation and discussion of these results are presented.

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