Geometric analysis and constrained optimization of woven z-pinned composites for maximization of elastic properties

Esmaeeli, Meysam; Nami, Mohammad Rahim; Kazemianfar, Behzad

doi:10.1016/j.compstruct.2018.11.070

Cited by 22 publications

(2 citation statements)

References 26 publications

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“…Cohesive damage model for analyzing the bridging mechanism of a single Z‐pin in quasi‐isotropic laminates in type I, type II, and mixed modes. Esmaeeli et al 18 conducted a parametric study on the geometric single cell of Z‐pin composites, evaluated the optimization variables, defined the constrained optimization problem, and solved it using an improved artificial bee colony algorithm. The results showed that the optimal out‐of‐plane elastic modulus depends strongly on the distribution density of Z‐pins and the ratio of yarn width to Z‐pin radius.…”

Section: Introductionmentioning

confidence: 99%

Progressive damage analysis of Z‐pin reinforced composite laminates based on CDM

Shi,

Guo,

Niu

et al. 2024

Polymer Composites

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A RVE finite element model was developed, and the effective mechanical properties were predicted by analyzing the fine structure of Z‐pin reinforced composite laminates. A new damage criterion based on strain description is adopted, a progressive damage analysis model is established and progressive damage analysis is carried out, which provides a reference for further research on Z‐pin reinforced composites. By applying both longitudinal tensile and in‐plane shear loads to the RVE, the material strength prediction was carried out the damage evolution process was emphasized, and the stress–strain curves of the material as well as the damage modes and damage levels in different regions were finally predicted. From the damage evolution process, it can be seen that the damage in the fiber direction and the damage in the transverse direction appear the earliest and have the highest percentage of failure.Highlights The RVE model was developed and its effective mechanical properties were predicted. A new damage criterion is introduced, a UMAT subroutine is written, and a progressive damage model is developed. Material strength predictions were made for the RVE and the damage evolution process was emphasized.

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Section: Introductionmentioning

confidence: 99%

Progressive damage analysis of Z‐pin reinforced composite laminates based on CDM

Shi,

Guo,

Niu

et al. 2024

Polymer Composites

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“…On the other side, its highly crosslinked structure leads to brittleness and thus to poor resistance to crack propagation [1,2]. Among the several methods that have been presented during the years to increase the fracture toughness of carbon/epoxy laminates [3][4][5][6], interleaving polymers [7][8][9], in the form of particles, films, or nanofibrous mats [10][11][12][13][14][15][16], has proved to be one of the most effective. In particular, nanofibrous mats have been found to be a suitable choice because of their high porosity (which lead to rapid penetration of epoxy) and the strengthening effects they are able to provide.…”

Section: Introductionmentioning

confidence: 99%

Toughening Behavior of Carbon/Epoxy Laminates Interleaved by PSF/PVDF Composite Nanofibers

et al. 2020

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This paper presents an investigation on fracture behavior of carbon/epoxy composite laminates interleaved with electrospun nanofibers. Three different mats were manufactured and interleaved, using only polyvinylidene fluoride (PVDF), only polysulfone (PSF), and their combination. Mode-I and Mode-II fracture mechanics tests were conducted on virgin and nanomodified samples, and the results showed that PVDF and PSF nanofibers enhance the Mode-I critical energy release rate (GIC) by 66% and 51%, respectively, while using a combination of the two registered a 78% increment. The same phenomenon occurred under Mode-II loading. SEM micrographs were taken, to investigate the toughening mechanisms provided by the nanofibers.

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Low‐velocity impact resistance of the Z‐pin reinforced carbon fiber composite laminates

Wu,

Guo,

Shi

et al. 2024

Polymer Composites

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A voronoi user material subroutine (VUMAT) was developed using the three‐dimensional Hashin damage criterion and exponential nonlinear damage evolution method. An interlayer damage model based on the quadratic nominal stress (QUADS) criterion and B‐K fracture criterion was introduced, and a finite element model of Z‐pin reinforced composite laminates under low‐velocity impact was established. The low‐velocity impact behavior of Z‐pin reinforced composite laminates with different impact velocities (0.6 m/s, 0.4 m/s, and 0.3 m/s), different layup forms ([0°/90°]4 and [0°/45°/90°/−45°]2), and different Z‐pin spacing (4 mm, 8 mm, and 16 mm) was studied using ABAQUS. The results indicate that different layup forms have little effect on the low‐velocity impact behavior of Z‐pin reinforced composite laminates. The Z‐pin spacing has a significant influence on the low‐velocity impact behavior of Z‐pin reinforced composite laminates. When the impact velocity is 0.4 m/s, the specific energy absorption of composite laminates with Z‐pin spacing of 16 mm is 85.93% and 87.7% lower than that of composite laminates with Z‐pin spacing of 4 mm and 8 mm. As the Z‐pin spacing decreases (Z‐pin density increases), the impact resistance of Z‐pin reinforced composite laminates first increases and then decreases.Highlights• The low‐velocity impact of Z‐pin reinforced composite laminates was studied.• Analyzed the effect of layup forms of laminates on their impact behavior.• Explored the influence mechanism of Z‐pin spacing on the impact behavior.• Studied the energy absorption of different Z‐pin spacing under impact velocity.

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Geometric analysis and constrained optimization of woven z-pinned composites for maximization of elastic properties

Cited by 22 publications

References 26 publications

Progressive damage analysis of Z‐pin reinforced composite laminates based on CDM

Progressive damage analysis of Z‐pin reinforced composite laminates based on CDM

Toughening Behavior of Carbon/Epoxy Laminates Interleaved by PSF/PVDF Composite Nanofibers

Low‐velocity impact resistance of the Z‐pin reinforced carbon fiber composite laminates

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