Compressive failure of fiber composites under multi-axial loading

Basu, Shiladitya; Waas, Anthony M.; Ambur, Damodar R.

doi:10.1016/j.jmps.2005.09.004

Cited by 71 publications

(47 citation statements)

References 48 publications

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“…[13][14][15][16][17] Small misalignments of the fibers lead to fiber rotation as the structure is loaded. These rotations induce matrix softening in shear; which, in turn, leads to further fiber rotations.…”

Section: Nasa Sti Program In Profilementioning

confidence: 99%

“…Single and dual ISV formulations of Schapery Theory (ST) have been used to model microdamage alone and both microdamage and transverse cracking in analytical and numerical frameworks. 2,17,54,55 Lamina-level ST represents each layer as a homogenized continuum and uses the amount of energy necessary to advance structural changes within the material, associated with the damage mechanisms, to govern damage growth in a thermodynamically consistent manner. Each damage mechanism is accounted for through separate ISVs which are related to the degraded stiffness' through a set of measurable damage functions.…”

Section: Nasa Sti Program In Profilementioning

confidence: 99%

“…Microdamage is considered the advancement of microcracks, voids, fissures, shear bands, and other flaws that are present in the matrix of a composite. 2,3,17,54 The size of these flaws is typically on the order of that of the fiber or smaller. Transverse cracks nucleate from preexisting flaws within the matrix but grow parallel to the fibers and span the thickness of the lamina.…”

Section: Iia Dual-isv Formulation Of St To Model Progressive Microdmentioning

confidence: 99%

“…If the loading is compressive, this feedback will lead to a runaway instability and regions of microbuckled, or kinked, fibers will develop. In previous studies, 17 where the loading was compression dominated, the instantaneous fiber rotation is captured in conjunction with ST. This has the advantage of predicting fiber kinking failure, from a knowledge of basic constituent level properties, avoiding the use of an explicit fiber direction compressive strength criterion, and the need for an additional coupon level test to measure compression strength, X c .…”

Section: Iib2 Determining the Damage Statementioning

confidence: 99%

See 3 more Smart Citations

Computational Implementation of a Thermodynamically Based Work Potential Model for Progressive Microdamage and Transverse Cracking in Fiber-reinforced Laminates

Pineda

Waas²,

Bednarcyk

et al. 2010

51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

6
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11
0

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Section: Nasa Sti Program In Profilementioning
confidence: 99%

Section: Iia Dual-isv Formulation Of St To Model Progressive Microdmentioning
confidence: 99%

Section: Iib2 Determining the Damage Statementioning
confidence: 99%

See 2 more Smart Citations
Computational Implementation of a Thermodynamically Based Work Potential Model for Progressive Microdamage and Transverse Cracking in Fiber-reinforced Laminates
Pineda
¹
,
Waas²,
Bednarcyk
³

et al. 2010
51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
6
0
11
0
View full text Add to dashboard Cite

“…However, the impact of fiber misalignment on the composite response, which often can occur in modern composites [7], is typically not accounted for in design and analysis. A notable exception is the effect of longitudinal fiber misalignment on the compressive failure response of composites, which has been studied extensively in the literature (c.f., [10,34,37,11,33,35,22,8,31,40,6]). Such misalignment can occur due to manufacturing deficiency and defects, curved surfaces, and fiber waviness, which was investigated by Kugler and Moon [18].…”

Section: Introductionmentioning
confidence: 99%

The effect of general statistical fiber misalignment on predicted damage initiation in composites
Bednarcyk
¹
,
Aboudi
²
,
Arnold
³

2014
Composites Part B: Engineering
45
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15
0
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a b s t r a c tA micromechanical method is employed for the prediction of unidirectional composites in which the fiber orientation can possess various statistical misalignment distributions. The method relies on the probability-weighted averaging of the appropriate concentration tensors, which are established by the micromechanical procedure. This approach provides access to the local field quantities throughout the constituents, from which initiation of damage in the composite can be predicted. In contrast, a typical macromechanical procedure can determine the effective composite elastic properties in the presence of statistical fiber misalignment, but cannot provide the local fields. Fully random fiber distribution is presented as a special case using the proposed micromechanical method. Results are given that illustrate the effects of various amounts of fiber misalignment in terms of the standard deviations of in-plane and out-of-plane misalignment angles, where normal distributions have been employed. Damage initiation envelopes, local fields, effective moduli, and strengths are predicted for polymer and ceramic matrix composites with given normal distributions of misalignment angles, as well as fully random fiber orientation.Published by Elsevier Ltd.

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Microscale and mesoscale modeling for compressive failure in unidirectional carbon fiber reinforced polymer composites with random distribution of fiber misalignments
Xie,
Ning
2024
Polymer Composites
0
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0
0
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Compressive strength and failure mode of carbon fiber reinforced polymer (CFRP) composites are affected by the severity of fiber misalignment. In this paper, numerical models based on computational micromechanics are proposed to investigate the correlation between fiber misalignment and compression failure. A single‐fiber micromodel including fiber, matrix, and interface phases is first developed to capture the influence of misalignment severity on the material failure mode. The failure longitudinal stress distribution in the fiber predicted by the micromodel indicates that the failure mode depending on the initial misalignment can be identified as uniform compression failure, compression‐bending combination collapse, and fiber buckle. A mesoscale 2D model with multiple fibers is then constructed to investigate the kink band formation. This model takes into account the distribution of fiber misalignments to capture the key geometric features of fiber misalignment that influent the compression failure in realistic composite materials at the structural scale. The results show that fiber misalignment angle amplitude, misalignment dispersion (characterized by the standard deviation), and misalignment wavelength are the key parameters of fiber misalignment, which have significant effects on compression strength and kink band geometry.Highlights Single‐fiber model to capture the effect of misalignment severity on failure mode. Multi‐fiber model with randomly distributed fiber misalignments. Failure mode depending on the severity of initial misalignment was identified. Key parameters of misalignment on compression strength and kink band geometry.

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Compressive failure of fiber composites under multi-axial loading

Cited by 71 publications

References 48 publications

Computational Implementation of a Thermodynamically Based Work Potential Model for Progressive Microdamage and Transverse Cracking in Fiber-reinforced Laminates

Computational Implementation of a Thermodynamically Based Work Potential Model for Progressive Microdamage and Transverse Cracking in Fiber-reinforced Laminates

The effect of general statistical fiber misalignment on predicted damage initiation in composites

Microscale and mesoscale modeling for compressive failure in unidirectional carbon fiber reinforced polymer composites with random distribution of fiber misalignments

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