scholarly journals Micromechanical modeling of damage and load transfer in particulate composites with partially debonded interface

2016 ◽  
Vol 155 ◽  
pp. 77-88 ◽  
Author(s):  
Nicolas Despringre ◽  
Yves Chemisky ◽  
Kevin Bonnay ◽  
Fodil Meraghni
Keyword(s):  
Load Transfer ◽  
Particulate Composites ◽  
Micromechanical Modeling ◽  
Debonded Interface

Can the Strength of Brittle Materials be Enhanced?

1992 ◽  
Vol 291 ◽  
Author(s):  
L. Monette ◽  
M. P. Anderson ◽  
G. S. Grest
Keyword(s):  
Computer Model ◽  
Random Distribution ◽  
Load Transfer ◽  
Volume Fraction ◽  
Fiber Composites ◽  
Short Fiber ◽  
Particulate Composites ◽  
Second Phase ◽  
Two Dimensional ◽  
Fiber Volume

ABSTRACTWe have employed a two-dimensional computer model to study the effect of volume fraction of second phase constituents on load transfer (stiffness) and strength in brittle short-fiber composites, i.e. composites containing a random distribution of aligned fibers, and brittle particulate composites. We find that the efficiency of load transfer to the second phase consituent increases with volume fraction in particulate composites, while it decreases for short-fiber composites. The strength of brittle particulate composites is found to decrease, while the strength of brittle short-fiber composites marginally increases only at fiber volume fractions equal or greater than 0.25.

Mechanical response of carbon nanotube reinforced particulate composites with implications for polymer bonded explosives

2021 ◽  
pp. 002199832199086
Author(s):  
Eliseo E Iglesias ◽  
Tyler Rowe ◽  
Kyle Fernandez ◽  
Sidney Chocron ◽  
Justin Wilkerson
Keyword(s):  
Energetic Materials ◽  
Load Transfer ◽  
Mechanical Response ◽  
Particulate Composites ◽  
Binder Phase ◽  
Static Compression ◽  
Performance Effects ◽  
Polymer Bonded Explosives ◽  
Multi Walled Carbon Nanotubes ◽  
Quasi Static Compression

Modern polymer bonded explosives (PBX) are often characterized by a sensitive response to external thermomechanical insult that in some cases lead to accidental detonation. Current strategies for desensitizing PBXs come at the expense of a significant reduction in performance. A possible method for desensitizing PBX without adverse performance effects is the multifunctional tailoring of mechanical properties through strategic incorporation of multi-walled carbon nanotubes (MWCNTs) directly into the binder phase. In this work, a fabrication method is presented that produces polymer bonded simulants (PBS) of PBX that incorporate MWCNTs into the binder phase, hydroxyl-terminated polybutadiene (HTPB). These materials were characterized via microscopy and unconfined quasi-static compression testing to determine the effects of MWCNTs. Quasi-static compression showed evidence of a MWCNT induced structural skeleton effect that provided the binder with an increased strength, load transfer, and a greater ability to resist strain localizations prior to failure. These enhancements demonstrate the potential of using MWCNTs to enhance energetic materials.

Micromechanical Modeling of Particulate Composites for Damping of Acoustic Waves

2005 ◽  
Vol 128 (3) ◽  
pp. 320-329 ◽  
Author(s):  
Michael R. Haberman ◽  
Yves H. Berthelot ◽  
Mohammed Cherkaoui
Keyword(s):  
Experimental Data ◽  
Acoustic Waves ◽  
Multiple Scales ◽  
Transmission Loss ◽  
Matrix Material ◽  
Micromechanical Model ◽  
Particulate Composites ◽  
Micromechanical Modeling ◽  
Viscoelastic Composite ◽  
Quasistatic Regime

The self-consistent (SC) micromechanical model of a composite containing coated micro-inclusions, originally proposed in the static regime by Cherkaoui et al. (1994, J. Eng. Mater. Technol., 116, 274–278), is implemented in the quasistatic regime by the introduction of frequency dependent complex moduli for the matrix material. The original model is improved by using dilute strain concentration tensor (DSCT) formulation. It is shown that these concentration tensors can be used to approximate effective composite behavior of composites containing ellipsoidal inclusions having a known orientation distribution or of composites containing multiple types of coated inclusions. The DSCT formulation is also shown to be capable of modeling the effects of multiple scales (submicron-meso-macro), as well as that of a distribution of inclusion coating thicknesses. Various potential material modeling applications are verified through comparison with experimental data in the literature. Notably, the DSCT SC model is applied in the quasistatic regime for calculation of acoustic transmission loss of a slab of viscoelastic composite submerged in water for the range of frequencies between 0-100kHz and compared with experimental data of Baird et al. (1999, J. Acoust. Soc. Am., 105, 1527–1538).

scholarly journals Micromechanical modeling of nacre-mimetic Ti3C2-MXene nanocomposites with viscoelastic polymer matrix

MRS Advances ◽  
2021 ◽  
Author(s):  
Shreyas Srivatsa ◽  
Pawel Packo ◽  
Leon Mishnaevsky ◽  
Tadeusz Uhl ◽  
Krzysztof Grabowski
Keyword(s):  
Polymer Matrix ◽  
Load Transfer ◽  
Matrix Material ◽  
Compressive Load ◽  
Viscoelastic Behavior ◽  
Micromechanical Modeling ◽  
Damage Resistance ◽  
Plate Elements ◽  
Brick And Mortar ◽  
Constraint Method

AbstractA new two-dimensional nanomaterial—Titanium Carbide MXene (Ti3C2-MXene)—was reported in 2011. In this work, the microscale models of Ti3C2-MXene nanomaterial are considered with polymer matrix. The nanocomposites are modeled using nacre-mimetic brick-and-mortar assembly configurations due to enhanced mechanical properties and interlocking mechanism between the Ti3C2-MXene (brick) and polymer matrices (mortar). The polymer matrix material (Epoxy-resin) is modeled with elastic and viscoelastic behavior (Kelvin–Voigt Model). The Finite Element Method is used for numerical analysis of the microscale models with the multi-point constraint method to include Ti3C2-MXene fillers in the polymer matrix. Ti3C2-MXenes are considered as thick plate elements with transverse shear effects. The response of elastic and viscoelastic models of polymer matrix are studied. Finally, a tensile and compressive load is applied at the microscale and the effective load transfer due to nacre-mimetic configuration is discussed. This paper provides nacre-mimetic models to pre-design the nanocomposite for optimal performance with damage resistance and enhanced strength.

Micromechanical modeling of load transfer in fibrous composites

1998 ◽  
Vol 30 (4) ◽  
pp. 307-324 ◽  
Author(s):  
Adnan H. Nayfeh ◽  
Wael G. Abdelrahman
Keyword(s):  
Load Transfer ◽  
Micromechanical Modeling ◽  
Fibrous Composites

scholarly journals Micromechanical Modeling of Nacre-mimetic Ti3C2-MXene Nanocomposites with Viscoelastic Polymer Matrix

2021 ◽  
Author(s):  
Shreyas Srivatsa ◽  
Pawel Packo ◽  
Leon Mishnaevsky Jr. ◽  
Tadeusz Uhl ◽  
Krzysztof Grabowski
Keyword(s):  
Polymer Matrix ◽  
Load Transfer ◽  
Matrix Material ◽  
Compressive Load ◽  
Viscoelastic Behavior ◽  
Micromechanical Modeling ◽  
Damage Resistance ◽  
Plate Elements ◽  
Brick And Mortar ◽  
Constraint Method

A new two-dimensional nanomaterial – Titanium Carbide MXene (Ti3C2-MXene) – was reported in 2011. In this work, the microscale models of Ti3C2-MXene nanomaterial are considered with polymer matrix. The nanocomposites are modeled using nacre-mimetic brick-and-mortar assembly configurations due to enhanced mechanical properties and interlocking mechanism between the Ti3C2-MXene (brick) and polymer matrices (mortar). The polymer matrix material (Epoxy-resin) is modeled with elastic and viscoelastic behavior (Kelvin-Voigt Model). The Finite Element Method is used for numerical analysis of the microscale models with the multi-point constraint method to include Ti3C2-MXene fillers in the polymer matrix. Ti3C2-MXenes are considered as thick plate elements with transverse shear effects. The response of elastic and viscoelastic models of polymer matrix are studied. Finally, a tensile and compressive load is applied at the microscale and the effective load transfer due to nacre-mimetic configuration is discussed. This paper provides nacre-mimetic models to pre-design the nanocomposite for optimal performance with damage resistance and enhanced strength.

Preparation of Electron Transparent Metal-Matrix Composites

1968 ◽  
Vol 26 ◽  
pp. 334-335 ◽  
Author(s):  
M. R. Pinnel ◽  
A. Lawley
Keyword(s):  
Stainless Steel ◽  
Load Transfer ◽  
Volume Fraction ◽  
Steel Wire ◽  
Initial Step ◽  
Interfacial Region ◽  
Matrix Composites ◽  
Specific Test ◽  
The Matrix ◽  
The One

Numerous phenomenological descriptions of the mechanical behavior of composite materials have been developed. There is now an urgent need to study and interpret deformation behavior, load transfer, and strain distribution, in terms of micromechanisms at the atomic level. One approach is to characterize dislocation substructure resulting from specific test conditions by the various techniques of transmission electron microscopy. The present paper describes a technique for the preparation of electron transparent composites of aluminum-stainless steel, such that examination of the matrix-fiber (wire), or interfacial region is possible. Dislocation substructures are currently under examination following tensile, compressive, and creep loading. The technique complements and extends the one other study in this area by Hancock.The composite examined was hot-pressed (argon atmosphere) 99.99% aluminum reinforced with 15% volume fraction stainless steel wire (0.006″ dia.).Foils were prepared so that the stainless steel wires run longitudinally in the plane of the specimen i.e. the electron beam is perpendicular to the axes of the wires. The initial step involves cutting slices ∼0.040″ in thickness on a diamond slitting wheel.

Deformation at interfaces of Ti-6Al-4V/SiC fiber composites

1992 ◽  
Vol 50 (1) ◽  
pp. 158-159
Author(s):  
Warren J. Moberly ◽  
Daniel B. Miracle ◽  
S. Krishnamurthy
Keyword(s):  
Thermal Stresses ◽  
Load Transfer ◽  
Coefficient Of Thermal Expansion ◽  
Hot Isostatic Pressing ◽  
Matrix Composites ◽  
Ongoing Research ◽  
Aerospace Applications ◽  
Sic Fiber ◽  
The Matrix ◽  
Intermetallic Matrix Composites

Titanium-aluminum alloy metal matrix composites (MMC) and Ti-Al intermetallic matrix composites (IMC), reinforced with continuous SCS6 SiC fibers are leading candidates for high temperature aerospace applications such as the National Aerospace Plane (NASP). The nature of deformation at fiber / matrix interfaces is characterized in this ongoing research. One major concern is the mismatch in coefficient of thermal expansion (CTE) between the Ti-based matrix and the SiC fiber. This can lead to thermal stresses upon cooling down from the temperature incurred during hot isostatic pressing (HIP), which are sufficient to cause yielding in the matrix, and/or lead to fatigue from the thermal cycling that will be incurred during application, A second concern is the load transfer, from fiber to matrix, that is required if/when fiber fracture occurs. In both cases the stresses in the matrix are most severe at the interlace.

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