Abstract
This study explores the mechanical properties of particle- and unidirectional fiber-reinforced composite materials using the discrete element method (DEM) with an identical calibration technique. Determining micromechanical properties within DEM modeling is a time-consuming challenge typically requiring a distinct calibration approach for each specific model. In this research, we employ identical micromechanical properties for the generated discrete domain to simulate both types of composites. The findings in this paper suggest that an identical calibration procedure could potentially be effective for modeling composites, regardless of their varied reinforcement shapes. Given the computational costs associated with DEM modeling, this research presents a potential advancement in streamlining the DEM calibration process. The linear parallel-bond model served as the contact model in DEM simulations, offering realistic estimates for materials resembling cemented structures. Additionally, group logic was employed in DEM modeling to construct the reinforcement and matrix phases of the composites. Results were validated through FEM simulations and theoretical predictions, demonstrating a satisfactory level of agreement. Furthermore, this paper provides a comprehensive depiction of micro-crack initiation and propagation, along with various fracture modes, including matrix and fiber cracking, as well as matrix/fiber debonding, for both composite types.
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Abbreviations
- m :
-
The total mass of the particle
- \({{M}}_{{{i}}}\) :
-
Resultant moment acting on the particle
- \({{H}}_{{{i}}}\) :
-
Angular momentum of the particle
- \({{F}}_{{{i}}}\) :
-
Resultant force (the sum of all externally applied forces) acting on the particle
- \({{F}}_{{{i}}}^{{{n}}}\) :
-
Normal component vector
- \({{F}}_{{{i}}}^{{{s}}}\) :
-
Shear component vector
- \({{F}}^{{{l}}}\) :
-
Linear force
- \({{F}}^{{{d}}}\) :
-
Dashpot force
- \(\overline{{F}}\) :
-
Parallel-bond force
- \(\overline{{M}}\) :
-
Parallel-bond moment
- \({\Delta \delta }_{{{n}}}\) :
-
Relative normal-displacement increment
- \({\Delta \delta }_{{{s}}}\) :
-
Relative shear-displacement increment
- \({{\varDelta}}\theta_{{{t}}}\) :
-
Relative twist-rotation increment
- \({{\varDelta}}\theta_{{{b}}}\) :
-
Relative bend-rotation increment
- \(\overline{{A}}\) :
-
Cross-sectional area
- I :
-
Moment of inertia of the cross-sectional area about the neutral axis of the beam
- \(\overline{{I}}\) :
-
Moment of inertia of the parallel-bond cross section about the line passing through \(X_{c} \) and in the direction of \(\overline{M}_{b}\)
- J :
-
Polar moment of inertia of the cross-sectional area about the axis of the shaft
- \(\overline{{J}}\) :
-
Polar moment of inertia of the parallel-bond cross section about the line passing through \(X_{c}\) and in the direction of \(\hat{n}_{c}\)
- \({{k}}^{{{n}}}\) :
-
Normal stiffness [force/displacement] at the contact
- \({{k}}^{{{s}}}\) :
-
Shear stiffness [force/displacement] at the contact
- E :
-
Young’s modulus
- \({{E}}_{{{f}}}\) :
-
Fiber Young’s modulus
- \({{E}}_{{{m}}}\) :
-
Matrix Young’s modulus
- \({{E}}_{{{L}}}\) :
-
Young’s modulus in fiber direction
- \({{E}}_{{{T}}}\) :
-
Young’s modulus in direction perpendicular to the fiber direction
- G :
-
Shear modulus
- \({{G}}_{{{{LT}}}}\) :
-
Shear modulus in LT plane
- \({{G}}_{{T{T}^{\prime}}}\) :
-
Shear modulus in \(T{T}^{\prime}\) plane
- \({{\upsilon}}_{{{f}}}\) :
-
Fiber Poisson’s ratio
- \({{x}}_{{{i}}}\) :
-
Position of the particle’s center of mass
- \(\dot{{x}}_{{{i}}}\) :
-
The velocity of the particle
- \(\ddot{x}_{{{i}}}\) :
-
Acceleration of the particle
- \({{V}}_{{{i}}}^{{{s}}}\) :
-
Shear component of contact velocity
- \({{\omega}}_{{{i}}}\) :
-
Angular velocity of the particle
- \(\dot{{\omega }}_{{{i}}}\) :
-
Angular acceleration of the particle
- \({{g}}_{{{i}}}\) :
-
Body force acceleration vector (e.g., gravity loading)
- \({{X}}_{{{c}}}\) :
-
Location of contact plane
- \({{X}}_{{{f}}}\) :
-
The point on the wall facet closest to \(X^{\left( 1 \right)}\)
- \({{X}}_{{{w}}}\) :
-
The center of rotation of the wall
- \({{X}}^{{\left( {{b}} \right)}}\) :
-
The center of the ball b
- \({{R}}^{{\left( {{b}} \right)}}\) :
-
The radius of the ball b
- \({{g}}_{{{c}}}\) :
-
Contact gap
- d :
-
Distance between the ball centers
- \(\hat{{n}}_{{{c}}}\) :
-
Normal direction of contact plane
- \(\hat{{s}}_{{{c}}}\) :
-
Coordinate system of contact plane (s axis) (2D model: \(\hat{{s}}_{{{c}}} \equiv { } - \hat{k}\))
- \(\hat{{t}}_{{{c}}}\) :
-
Coordinate system of contact plane (t axis)
- ξ :
-
A measure of the fiber reinforcement based on its geometry, its arrangement, and the test type
- \(\overline{{\beta }}\) :
-
Moment-contribution factor
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Paziresh, A., Assaee, H. Identical calibration approach in discrete element method for modeling mechanical properties in fiber- and particle-reinforced composites. Comp. Part. Mech. (2024). https://doi.org/10.1007/s40571-024-00749-4
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DOI: https://doi.org/10.1007/s40571-024-00749-4