Modeling of scattered damage accumulation kinetics under combined stress

2012 ◽  
Vol 44 (1) ◽  
pp. 20-26 ◽  
Author(s):  
M. I. Bobyr ◽  
O. P. Khalimon ◽  
O. A. Bondarets
Keyword(s):  
Damage Accumulation ◽  
Combined Stress ◽  
Scattered Damage ◽  
Accumulation Kinetics

Simulation of the elementary damage accumulation kinetics in loaded materials

2010 ◽  
Vol 2010 (4) ◽  
pp. 281-284 ◽  
Author(s):  
D. V. Alekseev ◽  
G. A. Kazunina
Keyword(s):  
Damage Accumulation ◽  
Accumulation Kinetics

Quantitative Assessment of the Kinetics of Damage Accumulation in the Polymer Matrix Structure Under Full-Scale Climatic Factors and Tensile Loads

2021 ◽  
pp. 93-102
Author(s):  
В. П. Селяев ◽  
Д. Р. Низин ◽  
Н. С. Канаева
Keyword(s):  
Damage Accumulation ◽  
Climatic Factors ◽  
Full Scale ◽  
Polymer Materials ◽  
Strength Performance ◽  
Deformation Curves ◽  
Epoxy Polymers ◽  
Specific Index ◽  
Accumulation Kinetics ◽  
Kinetics Of

Постановка задачи. Изучено изменение упруго-прочностных показателей и кинетики накопления повреждений в эпоксидных полимерах под действием растягивающих нагрузок в контрольном состоянии и после натурного климатического воздействия в течение одного календарного года. Расчет кинетики накопления повреждений осуществлялся на основе авторской методики, основанной на использовании методов фрактального анализа кривых деформирования образцов полимерных материалов при растяжении. Результаты. Предложен удельный показатель θ, позволяющий количественно оценивать суммарное число повреждений на единицу прочности, накопление которого приводит к разрушению полимеров. Получены аппроксимирующие зависимости, описывающие взаимосвязь между удельным показателем θ и пределом прочности эпоксидных полимеров при растяжении. Выводы. Установлено, что наибольшей стабильностью свойств под действием натурного климатического воздействия обладает полимер на основе эпоксидной смолы «Этал-247». Statement of the problem. In the current study we look at the change in the elastic-strength performance and kinetics of damage accumulation in epoxy polymers under tensile loads in the control state and after full-scale climatic exposure during one calendar year were studied. Damage accumulation kinetics was calculated based on the author's method using methods of fractal analysis of deformation curves for polymer materials samples under tension. Results. We proposed specific index θ to quantify the total number of damages per unit of strength where its accumulation leads to the destruction of polymers. The dependences have been obtained that describe the relationship between specific index θ and tensile strength of epoxy polymers. Consclusion. The study has shown that the Etal-247 epoxy resin-based polymer cured with Etal-1440 amine hardener has the most stable properties under the full-scale climatic exposure.

Simulation of damage accumulation kinetics with a probabilistic cellular automaton

2006 ◽  
Vol 48 (2) ◽  
pp. 272-278 ◽  
Author(s):  
D. V. Alekseev ◽  
G. A. Kazunina
Keyword(s):  
Cellular Automaton ◽  
Damage Accumulation ◽  
Probabilistic Cellular Automaton ◽  
Accumulation Kinetics

scholarly journals Fatigue fracture criterion of composite materials

2019 ◽  
Vol 488 (5) ◽  
pp. 488-492
Author(s):  
A. R. Arutyunyan
Keyword(s):  
Composite Materials ◽  
Fatigue Strength ◽  
Fatigue Fracture ◽  
Damage Accumulation ◽  
Strength Criterion ◽  
Experimental Results ◽  
Reinforced Plastics ◽  
Damage And Fracture ◽  
Scattered Damage ◽  
The Moment

The first investigations on the fatigue strength of composite materials were carried out on cyclic tension of plastics reinforced by fiberglass. Since that time, intensive studies of fatigue strength of composite materials were begin. The experimental data obtained for different types of composite materials shown, that the fatigue fracture processes are governed by the accumulation of defects of different nature. The main mechanisms that determine the durability of composites is the kinetics of the damaged state development until the final fracture. At the same time, according to the experimental results, the damage accumulation curve of the total damage is defined by increased function of the time (number of loading cycles) until to the moment of macro fracture. In this paper, based on these studies and the conception of scattered damage and fracture, fatigue strength criterion is formulated. Fatigue criterion coefficients are concretized and damage accumulation curves are plotted, which depends on the number cycles and stress level. The comparison with experimental results on fatigue of glass-reinforced plastics and carbon fiber reinforced plastics is given.

scholarly journals QUANTITATIVE ASSESSMENT OF THE KINETICS OF DAMAGE ACCUMULATION IN THE POLYMER MATRIX STRUCTURE UNDER FULL-SCALE CLIMATIC FACTORS AND TENSILE LOADS

2021 ◽  
pp. 63-71
Author(s):  
V. P. Selyaev ◽  
D. R. Nizin ◽  
N. S. Kanaeva
Keyword(s):  
Damage Accumulation ◽  
Climatic Factors ◽  
Full Scale ◽  
Polymer Materials ◽  
Strength Performance ◽  
Deformation Curves ◽  
Specific Index ◽  
Accumulation Kinetics ◽  
The Relationship ◽  
Kinetics Of

Statement of the problem. In the current study we look at the change in the elastic-strength performance and kinetics of damage accumulation in epoxy polymers under tensile loads in the control state and after full-scale climatic exposure during one calendar year were studied. Damage accumulation kinetics was calculated based on the author's method using methods of fractal analysis of deformation curves for polymer materials samples under tension.Results. We proposed specific index θ to quantify the total number of damages per unit of strength,where its accumulation leads to the destruction of polymers. We obtained approximating dependences that describe the relationship between specific index θ and tensile strength of epoxy polymers.Consclusion. The study has shown that the Etal-247 epoxy resin-based polymer cured withEtal-1440 amine hardener has the most stable properties under the full-scale climatic exposure.

Fatigue of Unidirectional Cord-Rubber Composites

1999 ◽  
Vol 27 (1) ◽  
pp. 48-57 ◽  
Author(s):  
Y. Liu ◽  
Z. Wan ◽  
Z. Tian ◽  
X. Du ◽  
J. Jiang ◽  
...  
Keyword(s):  
Damage Accumulation ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Constant Load ◽  
Testing System ◽  
Rubber Composites ◽  
Cycle Frequency ◽  
Periodic Loading ◽  
Fatigue Damage Accumulation ◽  
Rubber Composite

Abstract A fatigue testing system is established with which the real-time recording of stress, strain, temperature, and hysteresis loss of rubbers or cord-rubber composite specimens subjected to periodic loading or extension can be successfully carried out. Several problems are connected with the experimental study of the fatigue of rubber composites. In constant extension cycling, the specimen becomes relaxed because of the viscoelasticity of rubber composites, and the imposed tension-tension deformation becomes complex. In this method, the specimen is unlikely to fail unless the imposed extensions are very large. Constant load cycling can avoid the shortcomings of constant extension cycling. The specially designed clamps ensure that the specimen does not slip when the load retains a constant value. The Deformation and fatigue damage accumulation processes of rubber composites under periodic loading are also examined. Obviously, the effect of cycle frequency on the fatigue life of rubber composites can not be ignored because of the viscoelasticity of constituent materials. The increase of specimen surface temperature is relatively small in the case of 1 Hz, but the temperature can easily reach 100°C at the 8 Hz frequency. A method for evaluating the fatigue behavior of tires is proposed.

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