Simulation of characteristics of composite material with «liquid» matrix

2021 ◽  
Vol 0 (11) ◽  
pp. 28-35
Author(s):  
E. A. Kosenko ◽  
◽  
V. A. Nelyub ◽  
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Theoretical Model ◽  
Crack Growth ◽  
Strain State ◽  
Load Factor ◽  
Liquid Matrix ◽  
Finite Element Software ◽  
Reinforcing Filler ◽  
Elastic Characteristics

A theoretical model of composite material consisting of a fibrous reinforcing filler, epoxy and elastomer matrices is proposed. The main purpose of the elastomer matrix is relaxation of all stresses occurring under loading and blocking the crack growth. Such elastomer matrices were named as «liquid». The calculation of the stress-strain state of the developed composite material with «liquid» matrix was carried out by using the finite-element software Ansys. It was found out that when elastic characteristics of used elestomers were less, the level of maximal stresses was less and the load factor values were higher. Decreasing stresses results in the blocking of crack growth that leads to increasing durability of such materials.

scholarly journals New Composite Materials With a “Liquid” Matrix

2021 ◽  
Vol 346 ◽  
pp. 02009
Author(s):  
Ekaterina Kosenko ◽  
Vladimir Nelyub
Keyword(s):  
Composite Material ◽  
Crack Growth ◽  
Strain State ◽  
Element Model ◽  
Polymer Composite Material ◽  
Dynamic Loads ◽  
Liquid Matrix ◽  
Elastomeric Matrix ◽  
Thermosetting Epoxy ◽  
Elastic Characteristics

A new polymer composite material composed of a fibre reinforced filler and two types of matrices: thermosetting (epoxy) and elastomeric (organosilicon) is introduced. The main purpose of the elastomeric matrix is stress relaxation and slowdown and prevention of crack growth in the composite material under dynamic loads, including bending and delamination. In this study, a finite element model of such composite is developed and its stress-strain state is calculated depending on the elastic characteristics of the elastomer. It was established that the addition of an elastomeric matrix in the composite allows to stop the crack growth, and significantly increase the durability of such materials.

Stress Distribution Behavior of Spherical Plain Bearing Fabricated by TiAl-Based Composite Materials Based on the Finite Element Analysis

2014 ◽  
Vol 1061-1062 ◽  
pp. 649-652
Author(s):  
Jing Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Guang Ji Xue ◽  
Chang Xiu Zhou
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Composite Materials ◽  
Bearing Steel ◽  
Plain Bearing ◽  
Element Analysis ◽  
Specific Strength ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Spherical Plain Bearing

Spherical plain bearing is a sliding bearing have a spherical contact surface,it can bear larger load and automatically adjusted to the self-alignin. TiAl-based composite material is a material that be used to lightweight spherical plain bearing. The Simulation used the finite element software Ansys for the bearing’s static analysis.The material of outer ring using normal bearing steel, one group used the TiAl-based composite materials as the material of the inner ring, Another group the inner ring material is bearing steel 9Cr18. The law of the stress and strain produced by the two groups is consistent,the deformation of the composite materials is bigger under the same load, its elasticity modulus and density is smaller compared to the ordinary bearing steel,the composite material has the advantages of high specific strength especially in the occasions have strict requirements of the bearing weight.

Comparative Analysis of Crack Growth Characteristics Based on Virtual Crack Closure Technique

2014 ◽  
Vol 633-634 ◽  
pp. 59-62
Author(s):  
Wen Lin Liu ◽  
Da Zhao Yu ◽  
Zhong Hu Jia
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Crack Closure ◽  
Element Model ◽  
Virtual Crack Closure Technique ◽  
Closure Technique ◽  
Engineering Structures ◽  
Finite Element Software ◽  
User Subroutine ◽  
The Finite Element Model

The strain energy rate and the stress intensity factors in different crack growth stage were analyzed by virtual crack closure technique. The user subroutine is complied using Abaqus finite element software. The finite element model of crack growth was established by the Paris formula, then the fatigue crack growth process is simulated, the crack growth life is predicted. The method could be a powerful tool for engineers to study the fracture and fatigue problems in engineering structures.

scholarly journals Simulation of the stress-strain state of a tubular billet during the expansion of its middle part using rigid die

2021 ◽  
pp. 105-110
Author(s):  
Д.А. Потянихин ◽  
А.А. Синельщиков ◽  
Ко.Х. Мин
Keyword(s):  
Finite Element ◽  
Titanium Alloy ◽  
Strain State ◽  
Middle Part ◽  
Cold Plastic Deformation ◽  
Stress Strain ◽  
Finite Element Software ◽  
Stress Strain State ◽  
Tubular Blank ◽  
Rigid Die

В работе представлены результаты моделирования в конечно-элементном программном комплексе ANSYS напряженно-деформированного состояния тонкостенной трубчатой заготовки из титанового сплава ОТ4 в процессе раздачи эластичной средой по жесткой матрице. Рассматривается осесимметричная матрица в виде тела вращения с криволинейной образующей. Задача решается в осесимметричной квазистационарной постановке. Конечно-элементная модель включает пуансон, матрицу, трубчатую заготовку, и эластичное рабочее тело. Пуансон перемещается в вертикальном направлении вниз, передавая усилие на деформируемую деталь через рабочее тело. Фрикционное взаимодействие происходит по закону Кулона. Проведен анализ напряженно-деформированного состояния детали в процессе формообразования. Исследовано распределение остаточных напряжений, упругое пружинение после снятия нагрузки и утонение стенок детали. Показана возможность получения детали типа «переходник» из титанового сплава ОТ4 холодным пластическим деформированием без нагрева заготовки. In this paper, the results of simulation of the stress-strain state of a thin-walled tubular blank made from titanium alloy OT4 in the ANSYS finite element software package in the process of expansion by an elastic medium in the rigid die are presented. The axisymmetric die in the form of a body of revolution with a curvilinear generatrix is considered. The problem is solved in an axisymmetric quasi-stationary setting. The finite element model includes a punch, a die, a tubular blank, and an elastic working body. The punch moves vertically downward, transmitting the force to the deformed tube through the working body. Frictional interaction occurs according to the Coulomb's law. The analysis of the stress-strain state of the deformed detail in the process of shaping is carried out. Distribution of residual stresses, elastic spring back after removal of the load and wall thinning of the detail are investigated. The possibility of obtaining the "adapter" type detail from titanium alloy OT4 by cold plastic deformation without heating the blank is shown.

scholarly journals Three- Dimensional Simulation of Crack Propagation using Finite Element Method

2019 ◽  
Vol 9 (2) ◽  
pp. 892-897 ◽  
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Crack Growth ◽  
Stress Intensity Factors ◽  
Crack Path ◽  
Three Dimensional ◽  
Life Time ◽  
Intensity Factors ◽  
Growth Step ◽  
Finite Element Software

The 3D finite element software ANSYS Workbench software has been employed for simulation of engineering geometries which are containing a pre-cracks and holes. The new feature in this software is using the smart crack growth procedure and the mesh smoothing technique which provides an adaptive and smooth mesh around the crack path as well as the higher stresses area. Under the assumption of LEFM, the stress intensity factors was used as a crack growth criterion which provided as indicators of failure compared to the fracture toughness or threshold stress intensity factors (SIFs) in both static and dynamic loading respectively. The stress intensity factors were calculated for every crack growth step and the fatigue life time was predicted according to the number of cycles. The effect of the nominal notch position of the crack was illustrated. Simulations performed with Ansys show an identical crack path on structures that is in line with that of the experimental and numerical results performed by other researchers.

A Different Approach for Obtaining the Shear Moduliof a Composite Material

2020 ◽  
Vol 70 (12) ◽  
pp. 4470-4476
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Elastic Modulus ◽  
Shear Modulus ◽  
Finite Element Model ◽  
Element Model ◽  
Layered Composite ◽  
Element Analysis ◽  
Shear Elastic Modulus ◽  
Elastic Characteristics

In recent years the composites materials gained a major importance in all fields of engineering, because they offer a successful replacement for classical materials conferring similar elastic-mechanical properties to metal or non-metal alloys presenting several advantages such as reduced mass, chemical resistance etc. Considering this, during the design, dull knowledge of the elastic-mechanical characteristics is of high importance. The present paper aims to create a finite element model able to predict the shear elastic modulus of a double-layered composite material based on the elastic characteristics of its constituents. For this, once the elastic characteristics of the constituents determined, they could be used in the finite element analysis obtaining consequently the shear modulus for the composite material. Also, the shear elastic modulus of the resultant composite was determined experimentally. The results of the finite element model were compared to the experimental values in order to validate the finite element analyses results. Keywords: composites, fiberglass, shear modulus, FEM

Study on Fatigue Crack Growth Model of 7075-T7410 Aluminum Alloy Straight Attachment Lug

2011 ◽  
Vol 66-68 ◽  
pp. 82-89
Author(s):  
Li Ming Wu ◽  
Yu Ting He ◽  
Xin Bo Wang ◽  
Hai Wei Zhang ◽  
Jin Qiang Du ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Model ◽  
Outer Radius ◽  
Finite Element Software ◽  
Inside Radius ◽  
Crack Growth Model

The finite element model of a 7075-T7410 straight attachment lug is built by using the finite element software ANSYS, a cosine distribution pin-bearing pressure is applied on the surface of the pin-hole as a boundary condition. The stress intensity factor (SIF) expression for the straight attachment lug with a single through-the-thickness crack and subjected to an axial pin-load is determined by studying on the effect of the geometric parameters (the dimensionless crack length a/R1，the ratio of outer radius to inside radius R2/R1 and the inside radius R1) on SIF value. The fatigue crack growth velocity (da-dN) and the stress intensity factor’s amplitude (ΔK) is calculated by the SIFs equations to get the values of the Paris constants, offering an analytical method for establishment of the fatigue crack growth model of the typical straight lugs. The paper can be helpful in assessing and designing damage tolerant attachment lugs.

Construction of Contact Model of Wheelset Assembly Surface Based on ABAQUS

2014 ◽  
Vol 577 ◽  
pp. 236-239
Author(s):  
Jun Xiao ◽  
Kai Qiang Zhou ◽  
Ren Zhou ◽  
Zhen Dong Lu ◽  
Meng Meng Yang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Finite Element ◽  
Friction Coefficient ◽  
Strain State ◽  
Element Model ◽  
Improve Quality ◽  
Finite Element Software ◽  
Press Fit ◽  
Mating Surface

In order to improve quality of wheelset assembly, a method for calculating interference between two sliding asperities that corresponding to the wheelset assembly interference is presented. A finite element model of sliding spherical asperity has been built with the finite element software ABAQUS to analyze the interaction among mating surface roughness, stress-strain state and press-fit curve. This study shows that final fitting force greatly increases with roughness when roughness is lower then 1.8μm and it is unpredicted when roughness is higher. Contact stress and friction coefficient between mating surfaces increase with roughness.

scholarly journals Numerical analysis of mechanical safety parameters of Congress Hall building in Chelyabinsk

2019 ◽  
Vol 15 (4) ◽  
pp. 251-260
Author(s):  
Alexander M. Belostotsky ◽  
Pavel A. Akimov ◽  
Dmitry S. Dmitriev ◽  
Andrey S. Pavlov ◽  
Yulia N. Dyadchenko ◽  
...  
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Progressive Collapse ◽  
Stress Strain ◽  
Load Bearing ◽  
Finite Element Software ◽  
Stress Strain State ◽  
State Strength ◽  
Collapse Analysis ◽  
Progressive Collapse Analysis

Aims of research. The article is devoted to actual problems of computational analysis of stress-strain state, strength and stability of load-bearing structures with allowance for the main and special combinations of loads and impacts, comparison of the results of alternative structural analysis of unique cultural and business complex “Congress Hall” in Chelyabinsk. The natural conditions of the area of location of this object and main load-bearing structures of the object are described. Besides, characteristic and design loads, their combinations, formulation of objectives of computational research and methods of solution are presented. Methods. Space discretization and solution of the corresponding problems of mathematical (numerical) and computer modelling of the considering unique building were carried out with the use of finite element method. Detailed finite element models of the coupled system “combined foundation - loadbearing structures” and its fragments (subsystems) were developed and verified. They adequately reflect geometric-stiffness, inertial and load parameters of the object and the resulting stress-strain state. Progressive collapse analysis are under consideration as well. Licensed, certified and verified (by the Russian Academy of Architecture and Construction Sciences) finite element software package “ANSYS Mechanical” was used. Results. The resulting parameters of stress-strain state, strength and dynamics of load-bearing structures of the building with allowance for design (in accordance with design codes) combinations of vertical and wind loads are considered. Besides, information about results of progressive collapse analysis is presented. Thus, a reasonable conclusion is made about the reliability of the criterion parameters of strength, stability and dynamics of the load-bearing structures of the object.

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