A multiscale analysis for predicting the elastic properties of 3D woven composites containing void defects

2018 ◽  
Vol 185 ◽  
pp. 401-410 ◽  
Author(s):  
Tao Huang ◽  
Yaohua Gong
Keyword(s):  
Elastic Properties ◽  
Multiscale Analysis ◽  
Woven Composites ◽  
Void Defects ◽  
3D Woven Composites

scholarly journals Multiscale Analysis of Mechanical Properties of 3D Orthogonal Woven Composites with Randomly Distributed Voids

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5247
Author(s):  
Yaohua Gong ◽  
Tao Huang ◽  
Xun’an Zhang ◽  
Yongyong Suo ◽  
Purong Jia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Multiscale Analysis ◽  
Three Dimensional ◽  
Woven Composites ◽  
Manufacturing Processes ◽  
Design Basis ◽  
Void Defects ◽  
3D Woven Composites ◽  
3D Orthogonal Woven

Voids are common defects in 3D woven composites because of the complicated manufacturing processes of the composites. In this study, a micro–meso multiscale analysis was conducted to evaluate the influence of voids on the mechanical properties of three-dimensional orthogonal woven composites. Statistical analysis was implemented to calculate the outputs of models under the different scales. A method is proposed to generate the reasonable mechanical properties of the microscale models considering randomly distributed voids and fiber filaments. The distributions of the generated properties agree well with the calculated results. These properties were utilized as inputs for the mesoscale models, in which void defects were also considered. The effects of these defects were calculated and investigated. The results indicate that tensile and shear strengths were more sensitive to the microscale voids, while the compressive strength was more influenced by mesoscale voids. The results of this study can provide a design basis for evaluating the quality of 3D woven composites with void defects.

Evaluation of Elastic Properties of Satin Composites

2013 ◽  
Vol 577-578 ◽  
pp. 229-232
Author(s):  
S. Patel ◽  
Omar Bacarreza ◽  
M.H. Aliabadi
Keyword(s):  
Elastic Properties ◽  
Stiffness Matrix ◽  
Woven Composites ◽  
Scale Analysis ◽  
Woven Composite ◽  
New Materials ◽  
Element Analysis ◽  
Multi Scale ◽  
3D Woven Composites ◽  
Multi Scale Analysis

Advancements in the numerical modelling of 3D woven composites have allowed improved understanding of the mechanical behaviour and in turn aided the design and analysis of new materials. The objectives of this paper are to utilise FEA (Finite Element Analysis) methods to determine the elastic properties of a given woven composite. The investigation focuses on satin weaves, considering both 5-harness and 8-harness varieties. Multi-scale analysis results of an RVE are used to formulate the stiffness matrix and consequently determine the elastic properties; these will be compared to published analytical methods and experimental results. Further investigations considering the effect of weave parameters on the elastic properties are conducted.

scholarly journals Open hole quasi-static and fatigue characterisation of 3D woven composites

2015 ◽  
Vol 131 ◽  
pp. 765-774 ◽  
Author(s):  
S. Dai ◽  
P.R. Cunningham ◽  
S. Marshall ◽  
C. Silva
Keyword(s):  
Woven Composites ◽  
Open Hole ◽  
3D Woven Composites

EXPERIMENTALLY VALIDATED SIMULATIONS OF BLIND HOLE DRILLING IN 3D WOVEN CARBON/EPOXY COMPOSITE WITH PROCESSING-INDUCED RESIDUAL STRESSES

2021 ◽  
Author(s):  
ARTURO LEOS ◽  
KOSTIANTYN VASYLEVSKYI ◽  
IGOR TSUKROV ◽  
TODD GROSS ◽  
BORYS DRACH
Keyword(s):  
Residual Stresses ◽  
Epoxy Matrix ◽  
Mechanical Performance ◽  
Matrix Cracking ◽  
Woven Composites ◽  
Hole Drilling ◽  
Blind Hole ◽  
Matrix Cracks ◽  
Numerical Predictions ◽  
3D Woven Composites

Manufacturing-induced residual stresses in carbon/epoxy 3D woven composites arise during cooling after curing due to a large difference in the coefficients of thermal expansion between the carbon fibers and the epoxy matrix. The magnitudes of these stresses appear to be higher in composites with high throughthickness reinforcement and in some cases are sufficient to lead to matrix cracking. This paper presents a numerical approach to simulation of development of manufacturing-induced residual stresses in an orthogonal 3D woven composite unit cell using finite element analysis. The proposed mesoscale modeling combines viscoelastic stress relaxation of the epoxy matrix and realistic reinforcement geometry (based on microtomography and fabric mechanics simulations) and includes imaginginformed interfacial (tow/matrix) cracks. Sensitivity of the numerical predictions to reinforcement geometry and presence of defects is discussed. To validate the predictions, blind hole drilling is simulated, and the predicted resulting surface displacements are compared to the experimentally measured values. The validated model provides an insight into the volumetric distribution of residual stresses in 3D woven composites. The presented approach can be used for studies of residual stress effects on mechanical performance of composites and strategies directed at their mitigation.

An evaluation of elastic properties and coefficients of thermal expansion of graphite fibres from macroscopic composite input data

2005 ◽  
Vol 461 (2054) ◽  
pp. 347-369 ◽  
Author(s):  
P. Rupnowski ◽  
M. Gentz ◽  
J. K. Sutter ◽  
M. Kumosa
Keyword(s):  
Thermal Expansion ◽  
Elastic Properties ◽  
Input Data ◽  
Matrix Material ◽  
Unidirectional Composite ◽  
Woven Composites ◽  
Woven Composite ◽  
Temperature Dependent ◽  
Fibre Properties ◽  
Representative Unit Cell

In this work, a methodology has been presented for the evaluation of stiffness properties and temperature–dependent coefficients of thermal expansion of continuous fibres from the macroscopic properties of either unidirectional or woven composites. The methodology was used to determine the stiffness and thermal properties of T650–35 graphite fibres from the macroscopic input data of unidirectional and woven composites based on the same fibres embedded in a PMR–15 polyimide matrix. In the first part of the analysis, the fibre properties were determined directly from the unidirectional composite macro data using the inversed Eshelby–Mori–Tanaka approach. Subsequently, certain fibre properties were additionally evaluated indirectly from the woven composite, using the finite–element method and the concept of a representative unit cell. It has been shown that the temperature–dependent coefficients of thermal expansion of the fibres can be estimated from the unidirectional composite macro data with significantly smaller errors than in the case of the elastic properties. It has also been shown that the errors in the evaluation of the elastic properties of the fibres from the macro unidirectional composite data could be significantly reduced if the fibres were placed in a stiff matrix material: much stiffer than the polyimide resin. The longitudinal and transverse coefficients of thermal expansions and the shear modulus of the T650–35 fibres determined from the unidirectional composite analysis were successfully verified by investigating the woven composite.

Modeling strategies of 3D woven composites: A review

2011 ◽  
Vol 93 (8) ◽  
pp. 1947-1963 ◽  
Author(s):  
Mahmood Ansar ◽  
Wang Xinwei ◽  
Zhou Chouwei
Keyword(s):  
Woven Composites ◽  
3D Woven Composites

Mesh generation and geometrical modelling of 3D woven composites with variable tow cross-sections

2012 ◽  
Vol 51 (1) ◽  
pp. 103-111 ◽  
Author(s):  
E. Potter ◽  
S.T. Pinho ◽  
P. Robinson ◽  
L. Iannucci ◽  
A.J. McMillan
Keyword(s):  
Cross Sections ◽  
Mesh Generation ◽  
Woven Composites ◽  
Geometrical Modelling ◽  
3D Woven Composites
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