Numerical Modelling of Particulate Composite with a Hyperelastic Matrix

2012 ◽  
Vol 525-526 ◽  
pp. 25-28
Author(s):  
Bohuslav Máša ◽  
Luboš Náhlík ◽  
Pavel Hutař
Keyword(s):  
Numerical Modelling ◽  
Damage Model ◽  
Strain Curve ◽  
Particulate Composite ◽  
Material Model ◽  
Particulate Composites ◽  
The Finite Element Method ◽  
Strain Energy Density Function ◽  
The Matrix ◽  
Good Agreement

The main aim of the paper is an estimation of the macroscopic mechanical properties of particulate composites using numerical methods. Matrix of the considered composite was cross-linked polymethyl methacrylate - PMMA in a rubbery state, which exhibits hyperelastic behaviour. The three parameter Mooney Rivlin material model, which is based on the strain energy density function, was chosen for description of the matrix behaviour. Alumina based particles (Al2O3) were used as a filler. Numerical modelling based on the finite element method (FEM) was performed to determine stress-strain curve of the considered particulate composite. Representative volume element (RVE) model was chosen for FE analyses as a modelling approach of a composite microstructure. Various geometry arrangements of particles and various directions of loading have been considered and composite anisotropy has been investigated. A good agreement between numerical calculations with damage model and experimental data has been found and the described method may have a great potential for numerical modelling of composite behaviour and design of new particulate composite materials.

Particulate Composite Damage: Numerical Estimation of Micro-Crack Paths

2014 ◽  
Vol 606 ◽  
pp. 261-264
Author(s):  
Zdeněk Majer ◽  
Pavel Hutař ◽  
Martin Ševčík ◽  
Luboš Náhlík
Keyword(s):  
Crack Propagation ◽  
Particulate Composite ◽  
Particulate Composites ◽  
Numerical Estimation ◽  
The Finite Element Method ◽  
Linear Elastic ◽  
Composite Damage ◽  
Three Phase ◽  
The Matrix ◽  
Crack Paths

The composites are widely used due to their advanced mechanical properties. Particulate composites with polymer matrix were studied with regard to micro-crack propagation in the matrix. A three phase numerical model was created. Linear elastic material properties of particle and matrix were taken from experiment. Using numerical simulations (based on the finite element method) the influence of interphase properties on micro-crack propagation was studied. The results of this paper can contribute to a better understanding of the micro-crack propagation in the particulate composites with respect to the interphase.

Numerical Modeling of Macroscopic Behavior of Particulate Composite with Crosslinked Polymer Matrix

2011 ◽  
Vol 465 ◽  
pp. 129-132
Author(s):  
Luboš Náhlík ◽  
Bohuslav Máša ◽  
Pavel Hutař
Keyword(s):  
Young’S Modulus ◽  
Polymer Matrix ◽  
Young's Modulus ◽  
Numerical Models ◽  
Strain Curve ◽  
Particulate Composite ◽  
Material Behavior ◽  
Particulate Composites ◽  
Stress Strain ◽  
Crosslinked Polymer

Particulate composites with crosslinked polymer matrix and solid fillers are one of important classes of materials such as construction materials, high-performance engineering materials, sealants, protective organic coatings, dental materials, or solid explosives. The main focus of a present paper is an estimation of the macroscopic Young’s modulus and stress-strain behavior of a particulate composite with polymer matrix. The particulate composite with a crosslinked polymer matrix in a rubbery state filled by an alumina-based mineral filler is investigated by means of the finite element method. A hyperelastic material behavior of the matrix was modeled by the Mooney-Rivlin material model. Numerical models on the base of unit cell were developed. The numerical results obtained were compared with experimental stress-strain curve and value of initial Young’s modulus. The paper can contribute to a better understanding of the behavior and failure of particulate composites with a crosslinked polymer matrix.

scholarly journals Using DEFORM Software for Determination of Parameters for Two Fracture Criteria on DIN 34CrNiMo6

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 445
Author(s):  
Ivana Poláková ◽  
Michal Zemko ◽  
Martin Rund ◽  
Ján Džugan
Keyword(s):  
Fracture Criterion ◽  
Damage Model ◽  
Material Model ◽  
Mechanical Tests ◽  
Fracture Criteria ◽  
Stress States ◽  
Determination Of Parameters ◽  
Accuracy Of Prediction ◽  
Good Agreement

The aim of this study was to calibrate a material model with two fracture criteria that is available in the DEFORM software on DIN 34CrNiMo6. The purpose is to propose a type of simple test that will be sufficient for the determination of damage parameters. The influence of the quantity of mechanical tests on the accuracy of the fracture criterion was explored. This approach was validated using several tests and simulations of damage in a tube and a round bar. These tests are used in engineering applications for their ease of manufacturing and their strong ability to fracture. The prediction of the time and location of the failure was based on the parameters of the relevant damage model. Normalized Cockroft-Latham and Oyane criteria were explored. The validation involved comparing the results of numerical simulation against the test data. The accuracy of prediction of fracture for various stress states using the criteria was evaluated. Both fracture criteria showed good agreement in terms of the fracture locus, but the Oyane criterion proved more suitable for cases covering larger triaxiality ranges.

Prediction of Trimming Process Parameters in Aluminum Sheet Materials Using FE Method

2004 ◽  
Author(s):  
Quan Situ ◽  
Mukesh K. Jain ◽  
Don R. Metzger
Keyword(s):  
Process Parameters ◽  
Fracture Initiation ◽  
Material Model ◽  
Aluminum Sheet ◽  
The Finite Element Method ◽  
Fe Method ◽  
Cut Edge ◽  
Sheet Materials ◽  
Material Separation ◽  
Good Agreement

The trimming process is an important step to achieve good dimension and shape of a final product. However, it requires a systematic study of the various parameters involved in material separation. The finite element method was utilized to simulate the trimming process of aluminum sheet materials in aspects of material properties, tooling conditions and process parameters, including different tool configurations, clearances and punch speeds. Punch load versus displacement diagrams and cut edge morphologies obtained from representative clearances and tool configurations were investigated. A two-dimensional plane strain trimming was analyzed using a rate independent material model. An experimentally measured fracture strain was utilized in FE modeling for fracture initiation and development using element deletion technique. A thermally coupled material model was tentatively tested. Results from simulations were compared with experiments and good agreement was obtained for most of the studied conditions. Optimal trimming process parameters such as specific tool configuration, clearance and punch speed are suggested.

Micro-Crack Propagation in Particulate Composite with Different Types of Matrix

2012 ◽  
Vol 245 ◽  
pp. 138-143 ◽  
Author(s):  
Zdeněk Majer ◽  
Luboš Náhlík
Keyword(s):  
Polymer Matrix ◽  
High Performance ◽  
Construction Materials ◽  
Particulate Composite ◽  
Polymer Particle ◽  
Material Behavior ◽  
Particulate Composites ◽  
Mineral Filler ◽  
Non Linear ◽  
The Matrix

Particulate composites with polymer matrix and solid fillers are one of important types of materials. Generally, these materials are usually used as construction materials, high-performance engineering materials or protective organic coatings. The main aim of a present paper is an estimation of the micro-crack behavior in the particulate composite with non-linear polymer matrix. The polymer matrix filled by magnesia-based mineral filler is investigated by means of the finite element method. A non-linear material behavior of the matrix was obtained from experiment as well as properties of mineral filler. Numerical model on the base of representative plane element (RPE) was developed. The results show that the presence of interphase between particle and matrix can improve fracture toughness of polymer particle composite through debonding process. The conclusions of this paper can contribute to a better understanding of the behavior of micro-crack in particulate composites with respect to interphase.

Load Influence on the Behavior of Micro-Crack in the Particulate Composite

2012 ◽  
Vol 525-526 ◽  
pp. 173-176 ◽  
Author(s):  
Zdeněk Majer
Keyword(s):  
Polymer Matrix ◽  
Particulate Composite ◽  
Material Behavior ◽  
Particulate Composites ◽  
Soft Matrix ◽  
Close Proximity ◽  
Plane Element ◽  
The Matrix ◽  
Soft Polymer ◽  
Mineral Fillers

Particulate composite with soft polymer matrix and rigid mineral fillers are one of most frequently used construction and engineering materials. The main focus of a present paper is an estimation of the load influence on behavior of micro-crack placed in close proximity to the particle with interphase in soft matrix. The particulate composite with polymer matrix filled by magnesium-based mineral fillers is investigated by means of the finite element method. A non-linear material behavior of the matrix was considered. Numerical model on the base of representative plane element (RPE) was developed. The conclusions of this paper can contribute to a better understanding of the behavior of micro-crack in particulate composites with soft polymer matrix.

scholarly journals A Lattice Model for Elastic Particulate Composites

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1584 ◽  
Author(s):  
Darius Zabulionis ◽  
Vytautas Rimša
Keyword(s):  
Mechanical Response ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Particulate Composite ◽  
High Volume ◽  
Spherical Particles ◽  
Particulate Composites ◽  
The Finite Element Method ◽  
Network Method

In the present article, a version of the lattice or spring network method is proposed to model the mechanical response of elastic particulate composites with a high volume fraction of spherical particles and with a much weaker matrix compared to the stiffness of the particles. The main subject of the article is the determination of the axial stiffnesses of the springs of the cell. A comparison of the mechanical response of a three-dimensional particulate composite cube obtained using the finite element method and the proposed methodology showed that the efficiency of the proposed methodology increases with an increasing volume fraction of the particles.

Prediction of Mixed-mode Fracture in Participate Composite Using a Damage Criterion

2001 ◽  
Vol 29 (2) ◽  
pp. 79-90 ◽  
Author(s):  
C. L. Chow ◽  
W. H. Tai ◽  
C. T. Liu
Keyword(s):  
Damage Mechanics ◽  
Damage Model ◽  
Particulate Composite ◽  
Material Model ◽  
Fracture Load ◽  
Mixed Mode Fracture ◽  
Test Results ◽  
Finite Element Package ◽  
Crack Initiation Angle ◽  
Theory Of Damage

Abstract In this paper, a damage-coupled Mooney-Rivlin hyperelastic material model and a damage failure criterion are developed based on the theory of damage mechanics. The model is applied to predict the crack initiation angle and fracture load of particulate composite plate under mixed load. The prediction is achieved by implementing the damage model in a finite element package ABAQUS through its user-specified material subroutine. The inclined angles of the pre-crack are θ = 0, 15, 30, 45, 60, and 75°. The predictions are compared with the test results and found to be in satisfactory agreement.

Using Isochronous Method to Calculate Creep Damage: Part 1

2017 ◽  
Author(s):  
Chithranjan Nadarajah ◽  
Benjamin F. Hantz ◽  
Sujay Krishnamurthy
Keyword(s):  
Closed Form Solution ◽  
Strain Curve ◽  
Creep Damage ◽  
Material Model ◽  
Form Solution ◽  
Creep Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Creep Stress ◽  
Good Agreement

This paper is Part 1 of two papers illustrating how isochronous curves can be used to determine creep stress and damage. In Part 1 of the paper two simple examples of two bars under axial load and a beam in pure bending are illustrated using a closed form solution to determine the creep stress and damage from an isochronous stress strain curves. For the two examples, the Omega material model was used for generating the isochronous stress strain curve and for computing the creep damage. The closed from solutions are compared with finite element analysis using isochronous stress strain curves as well as time explicit Omega creep model. The results from all the three analysis are found to be in good agreement.

Dislocation structures around SiO2 Particles in aged Cu-Cr-SiO2

1978 ◽  
Vol 36 (1) ◽  
pp. 594-595
Author(s):  
N.J. Long ◽  
M.H. Loretto ◽  
C.H. Lloyd
Keyword(s):  
Flow Stress ◽  
Single Crystals ◽  
Room Temperature ◽  
Thin Foil ◽  
Age Hardening ◽  
Dispersion Strengthening ◽  
Accurate Picture ◽  
The Matrix ◽  
Very High ◽  
Good Agreement

IntroductionThere have been several t.e.m. studies (1,2,3,4) of the dislocation arrangements in the matrix and around the particles in dispersion strengthened single crystals deformed in single slip. Good agreement has been obtained in general between the observed structures and the various theories for the flow stress and work hardening of this class of alloy. There has been though some difficulty in obtaining an accurate picture of these arrangements in the case when the obstacles are large (of the order of several 1000's Å). This is due to both the physical loss of dislocations from the thin foil in its preparation and to rearrangement of the structure on unloading and standing at room temperature under the influence of the very high localised stresses in the vicinity of the particles (2,3).This contribution presents part of a study of the Cu-Cr-SiO2 system where age hardening from the Cu-Cr and dispersion strengthening from Cu-Sio2 is combined.

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