Application of enhanced elasto-plastic damage models to concrete under quasi-static and dynamic cyclic loading

2010 ◽  
pp. 529-536 ◽  
Author(s):  
I Marzec ◽  
J Tejchman
Keyword(s):  
Cyclic Loading ◽  
Damage Models ◽  
Plastic Damage

Unilateral Damage in Reinforced Concrete Frames

2015 ◽  
pp. 445-502
Keyword(s):  
Cyclic Loading ◽  
Damage Mechanics ◽  
Industrial Applications ◽  
Concrete Frames ◽  
Dual Systems ◽  
Rc Structures ◽  
Damage Models ◽  
Rc Frames ◽  
Earthquake Vulnerability ◽  
Inertia Forces

One of the main applications of the lumped damage mechanics or the damage mechanics of dual systems is the earthquake vulnerability assessment of structures. This means not only the consideration of the inertia forces but, mainly, the adequate description of crack propagation under general cyclic loading. Chapter 9 described the concept of unilateral damage (i.e. the appearance of distinct and independent sets of cracks after loading reversals). This phenomenon can also be observed in RC structures, and the models presented in Chapters 10 and 11 do not describe it; thus, they should be used only in the cases of mono sign loadings. The first goal of this chapter is the generalization of the damage models, including unilateral effects; the next one consists of the development of lumped damage models for tridimensional analysis of RC frames. Finally, some guidelines for the use of the damage models in industrial applications are presented.

scholarly journals Damage Models for Monotonous and Cyclic Loading

PAMM ◽  
2002 ◽  
Vol 1 (1) ◽  
pp. 195 ◽  
Author(s):  
W. Brocks ◽  
D. Steglich
Keyword(s):  
Cyclic Loading ◽  
Damage Models

Yield Criterion in Plastic-Damage Models for Concrete

2010 ◽  
Vol 23 (3) ◽  
pp. 220-230 ◽  
Author(s):  
Ji Zhang ◽  
Zhongxian Zhang ◽  
Chuanyao Chen
Keyword(s):  
Yield Criterion ◽  
Damage Models ◽  
Plastic Damage

Ductile Tearing of Welds in Pipe Submitted to Cyclic Loading

2017 ◽  
Author(s):  
Philippe Thibaux ◽  
Steven Cooreman ◽  
Antonio Carlucci ◽  
Johan Vekeman ◽  
Koen Van Minnebruggen ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Cyclic Loading ◽  
Flow Behavior ◽  
Base Material ◽  
Small Deformation ◽  
Automatic Identification ◽  
Ductile Tearing ◽  
Damage Models ◽  
Fracture Tests ◽  
Tearing Resistance

Flowlines and risers can be submitted to plastic deformation, sometimes cyclically, due to the installation technique, or sometimes due to exceptional events. In this case, a specific evaluation of defect acceptance in the girth weld is necessary. The present study investigates the possibility to predict ductile tearing during installation when the performed fracture mechanics tests are only high triaxiality specimens and that the effective application requires cyclic loading. A classical analysis is performed using DNV RP F108 to determine the acceptable defect size of for the case in which a pipe is submitted to cyclic loading. In the present investigation, tearing resistance was characterized with SENB specimens. An engineering critical assessment (ECA) was performed considering the size of the expected defects and the amount of plastic deformation to which the pipeline would be submitted. A validation of the ECA was performed by segment tests. While the application of ECA based on the fracture tests would predict ductile tearing with the considered defect, the results of segment tests only revealed blunting for the considered plastic deformation. It confirms the effect that in lower constraint conditions (like in segment tests), SENB test results are overly conservative. The tearing phenomenon was then simulated by the finite element method using two different damage models (Gurson-Tvergard-Needlemann and the Bai-Wierzbicki model) and compared to the experimental results. As the deformation at the crack tip is typically very large, one needs to have knowledge about the hardening behavior in the post-necking region. As this behavior cannot be directly deduced from standard measurements, an automatic identification procedure was developed to determine the post-necking flow behavior of the weld metal and the base material transverse to the weld. As reported in the literature, simplified models like Rambord-Osgood are then inadequate and model including two hardening zones is necessary: one for small deformation and one for large deformation. The calibration of the damage models was only performed on the tearing curve obtained from the SENB experiments, and the segment tests were then “blindly” simulated.

TIME-DEPENDENT MECHANICAL BEHAVIOR OF CARBON BLACK FILLED ELASTOMERS

2011 ◽  
Vol 84 (3) ◽  
pp. 296-324 ◽  
Author(s):  
Aparajita Bhattacharya ◽  
Grigori A. Medvedev ◽  
James M. Caruthers
Keyword(s):  
Cyclic Loading ◽  
Stress Relaxation ◽  
Constitutive Models ◽  
Large Change ◽  
Time Dependent ◽  
Tangent Modulus ◽  
Strain Rate Effects ◽  
Damage Models ◽  
Filled Elastomers ◽  
Rate Effects

Abstract An extensive set of time-dependent mechanical data was obtained for several filled SBR elastomers, including Mullins experiments, cyclic loading experiments, and stress relaxation. These comprehensive data enable critical evaluation of three classes of constitutive models. Viscoelastic models can naturally describe the hysteresis upon loading/reloading, but are unable to capture the large change in tangent modulus between the initial loading and the modulus just as the specimen is being unloaded. Elastic-damage models can capture the large change in tangent modulus just prior versus subsequent to unloading of a virgin sample, but can only parameterize the hysteresis on cyclic loading and are unable to predict strain rate effects and stress relaxation. A viscoelastic-damage model can predict the large change in tangent modulus upon reversal of the strain, hysteresis, strain rate effects, and stress relaxation; however, viscoelastic-damage models are unable to simultaneously predict the modest amount of hysteresis observed in cyclic experiments and the large amount of stress relaxation observed after loading to large deformations. The analysis indicates that constitutive models that include different deformation mechanics than the traditional elastic, viscoelastic, and damage processes will be needed to describe the full range of mechanical behavior exhibited by carbon black filled elastomers.

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