Homogenization and Equivalent Beam Model for Fiber-Reinforced Tubular Profiles
Abstract
:1. Introduction
2. Motivation
3. Theoretical Background
3.1. Cross-Ply Laminates
3.2. Angle-Ply Laminates
4. Beam Slenderness Effect
4.1. Cross-Ply Laminates
4.2. Angle-Ply Laminates
4.3. Quasi-Isotropic Configuration
4.4. Bouligand Laminates
5. Comparison
- All the stiffnesses tends to have a constant value by increasing beam slenderness.
- The orthotropic scheme (0) is very efficient if subjected to shear, axial and bending actions, but not for torsional ones. However, it has a significant variation while increasing slenderness. Furthermore, it suffers from delamination, because the fibers being all parallel, tend to form a preferential fracture plane.
- The angle-ply scheme works conversely with respect to the orthotropic configuration (0). It has high torsional stiffness, but low axial, shear and bending ones. For the present configuration, the shear-bending coupling is negligible. It is possible to use Sun et al. [40] formulae to homogenize equivalent properties because its properties do not depend on the beam slenderness.
- The angle-ply scheme represents an intermediate solution between the orthotropic (0) and the angle-ply configurations. It has a lower axial, shear and bending stiffness of 50–60% approximately and torsional stiffness of 80% with respect to (0). The present stack, as well as , has very low shear-bending coupling stiffness values which can be neglected and invariability of stiffness constants with respect to slenderness.
- The quasi-isotropic laminate (0/ has stiffness values similar to the laminate , except for the torsional stiffness which decreases by approximately 30%. Being a quasi-isotropic laminate, it has a negligible shear-bending coupling stiffness. In this case, the constants of the stiffness matrix vary slightly with increasing slenderness.
- The laminate, studied by Mencattelli and Pinho [63], with the only exception of the orthotropic configuration (0), presents slightly higher values for axial, shear and bending stiffnesses, but lower values for torsional stiffness with respect to the others. Coupling effects are minimal, and a very small dependency on the beam slenderness for the main stiffness components , , , and is observed.
6. Laminates with Highly Positive and Negative Poisson Values
7. Validity and Limitations
- cross-ply laminates, except laminate (90) have lower values, approximately 10% for m and highly variable as a function of slenderness with respect to the equivalent orthotropic model;
- scheme has lower values than the reference of about 30% and invariant with respect to beam slenderness;
- and scheme have lower values than the reference of about 55% and 5%, respectively, and they are invariant with respect to beam slenderness;
- unbalanced laminates with a fiber pitch angle of , and have values lower than the reference of approximately 30% and 25%, respectively;
- scheme has lower values than the reference of approximately 30% for the CFRP configuration and 90% for the Graphite/RP6410;
- scheme has values very large errors of about 100% and it is invariant with respect to beam slenderness.
8. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Geometric | Mechanical | ||
---|---|---|---|
Average radius | 27 mm | 145,849.69 MPa | |
Length | 1000 mm | 11,030 MPa | |
Laminate thickness | 4 mm (Fixed) | 0.28 | |
Layer thickness | Variable | 6209.89 MPa | |
Area | 678.58 mm | 6209.89 MPa | |
Polar inertia | 497,400 mm | 3860.5 MPa | |
Inertia | 248,774.1516 mm |
Materials | E [MPa] | [%] |
---|---|---|
RP6410 | 1.65 | 3.30 |
RP6442 | 7.00 | 5.25 |
Graphite | 276,000 | - |
[MPa] | [MPa] | [MPa] | |||
---|---|---|---|---|---|
Graphite/RP6410 | 120,000 | 2.85 | 0.41 | 0.502 | 0.949 |
Graphite/RP6442 | 126,600 | 12.02 | 0.41 | 0.504 | 4 |
Graphite/RP6410 | CFRP | ||
---|---|---|---|
4498.23 MPa | 94,509.78 MPa | ||
3.02 MPa | 11,234.40 MPa | ||
−34.04 | 0.342 | ||
−0.023 | 0.041 | ||
23.33 MPa | 7395.17 MPa |
Laminates | Material | ||
---|---|---|---|
NP1 | Graphite/RP6410 | 42,800 | −6.38 |
HP1 | Graphite/RP6410 | 42,800 | 3.73 |
NP2 | Graphite/RP6442 | 10,530 | −6.15 |
HP2 | Graphite/RP6442 | 10,530 | 3.72 |
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Gnoli, D.; Babamohammadi, S.; Fantuzzi, N. Homogenization and Equivalent Beam Model for Fiber-Reinforced Tubular Profiles. Materials 2020, 13, 2069. https://doi.org/10.3390/ma13092069
Gnoli D, Babamohammadi S, Fantuzzi N. Homogenization and Equivalent Beam Model for Fiber-Reinforced Tubular Profiles. Materials. 2020; 13(9):2069. https://doi.org/10.3390/ma13092069
Chicago/Turabian StyleGnoli, Daniel, Sajjad Babamohammadi, and Nicholas Fantuzzi. 2020. "Homogenization and Equivalent Beam Model for Fiber-Reinforced Tubular Profiles" Materials 13, no. 9: 2069. https://doi.org/10.3390/ma13092069