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A Size Effect Study on the Splitting Crack Initiation and Propagation in Off-Axis Layers of Composite Laminates

YAO QIAO, QIWEI ZHANG, TROY NAKAGAWA, MARCO SALVIATO

Abstract


This work proposes an investigation on size effects in micro-scale splitting crack initiation and propagation and their consequences on the macro-scale structural behavior carbon-fiber reinforced polymers under transverse tension. Towards this goal, size effect tests were experimentally conducted on both notch-free [90]n composites and specimens with different notch types under three-point bending. The mechanical tests were followed by morphological studies to identify the micro-scale damage mechanisms and their evolution. The results clearly show that splitting crack initiation in the transverse direction of composites not only happens at the fiber/matrix interface but also in the matrix. Moreover, the subsequent development of these damage mechanisms can depend on the structure size. This interesting phenomenon inherently leads to size-dependent structural behavior which can be described through Baznt’s Size Effect Laws. This study on the splitting crack initiation and propagation can provide unprecedented information for the calibration and validation of micromechanical models for the damage behavior of fiber composites at the microscale.


DOI
10.12783/asc36/35781

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References


Qiao Y, Salviato M. Strength and cohesive behavior of thermoset polymers at the microscale: a

size-effect study. Eng Fract Mech 2019;213:100-17.

Qiao Y, Zhang Q, Salviato M. Effects of in-situ stress state on the plastic deformation, fracture,and

size scaling of thermoset polymers and related fiber-reinforced composites. The American Society

for Composites (ASC) 35th Annual Technical Conference, 2020.

Hexion, Bellevue, Washington, USA http://hexion.com

Fibre Glast, Brookville, Ohio State, USA https://www.fibreglast.com

Mefford CH, Qiao Y, Salviato M, Failure and scaling of graphene nanocomposites. Compos Struct

;176:961-72.

Guo K, Qiao Y, Salviato M. Scaling of fatigue crack growth in pristine epoxy. The American

Societyfor Composites (ASC) 33rd Annual Technical Conference, 18th US-Japan conference on

composite materials ASTM D30, 2018.

Allied High Tech Products, California, USA https://www.alliedhightech.com/

Baˇzant ZP, Cedolin L. Stability of structures: elastic, inelastic, fracture and damage theories.

Dover Publications, New York, 2003.

Salviato M, Chau VT, Li W, Baˇzant ZP, Cusatis G. Direct testing of gradual postpeak of fracture

specimens of fiber composites stabilized by enhanced grip stiffness and mass. J Appl Mech

;83(11):111003

Salviato, M., Kirane, K., Baˇzant, Z.P., Cusatis, G. Mode I and II interlaminar fracture in laminated

composites: a size effect study. J Appl Mech 2019, 86(9):091008.

Arndt CM, Carvalho NV, Czabaj MW. Experimental reexamination of transverse tensile strength

for IM7/8552 tape-laminate composites. J Compos Mater 2020;54(23):3297312

Asp LE, Berglund LA, Gudmundson P. Effects of a composite-like stress state on the fracture of

epoxies. Compos Sci Technol 1995;53(1):27-37.

Asp LE, Berglund LA, Talreja R. A criterion for crack initiation in glassy polymers subjected to

a composite-like stress state. Compos Sci Technol 1996;56(11):1291-301.

Asp LE, Berglund LA, Talreja R. Prediction of matrix-initiated transverse failure in polymer

composites. Compos Sci Technol 1996;56(9):1089-97.

Talreja R. Physical modelling of failure in composites. Phil Trans Royal Society A 2016;374.

Flaggs DL, Kural MH. Experimental determination of the in situ transverse lamina strength in

graphite/epoxy laminates. J Comp Mater 1982;16(2):10316.

Baˇzant ZP, Le JL. Probabilistic mechanics of quasibrittle structures: strength, lifetime, and size

effect. United Kingdom: Cambridge University Press, 2017.

Qiao Y. Understanding the mechanical behavior of polymer composites across stress states, length

and time scales via size effect, multi-axial testing and computational modeling. PhD dissertation,

University of Washington, 2021.

Qiao Y, Salviato M. Study of the fracturing behavior of thermoset polymer nanocomposites via

cohesive zone modeling. Compos Struct 2019;220:127-47.

LiW, Jin Z, Cusatis G. Size effect analysis for the characterization of marcellus shale quasi-brittle

fracture properties. Roch Mech Rock Eng 2019;52:1-18.

Ko S, Yang J, Tuttle ME, Salviato M, Effect of the platelet size on the fracturing behavior and

size effect of discontinuous fiber composite structures. Compos Struct 2019;227:111245.

Ko S, Davey J, Douglass S, Yang J, Tuttle ME, Salviato M. Effect of the Thickness on the

Fracturing Behavior of Discontinuous Fiber Composite Structures. Compos Part A-Appl S

;125:105520.

Salviato M, Kirane K, Ashari SE, Baˇzant ZP, Experimental and numerical investigation of intralaminar

energy dissipation and size effect in two-dimensional textile composites, Compos Sci

Technol 2016; 135:67-75.

Baˇzant ZP. Size effect in blunt fracture: concrete, rock, metal. J Eng Mech-ASCE

;110(4):51835.

Baˇzant ZP, Kazemi MT. Determination of fracture energy, process zone length and brittleness

number from size effect, with application to rock and concrete. Int J Fracture 1990;44:11131.

Gonzalez K, Xue J, Chu A, Kirane K. Fracture and energetic strength scaling of soft, brittle, and

weakly nonlinear elastomers. J Appl Mech 2020;87(4):041009.

Li W, Qiao Y, Fenner J, Warren K, Salviato M, Baˇzant ZP. Elastic and fracture behavior of threedimensional

ply-to-ply angle interlock woven composites: through-thickness, size effect, and

multiaxial tests. Compos Part C 2021;4:100098.

Elnekhaily S, Talreja R. Damage Initiation in Unidirectional Fiber Composites with Different

Degrees of Nonuniform Fiber Distribution. Compos Sci Technol 2018;155:22-32.

Talreja R. Physical Modelling of Failure in Composites. Phil Trans Royal Society A

;374;Talreja R. Physical Modelling of Failure in Composites.

Zhuang L, Talreja R, Varna, J. Tensile Failure of Unidirectional Composites from a Local Fracture

Plane. Compos Sci Technol 2016;133:119-27.

Maragoni L, Talreja R. Transverse Crack Formation in Unidirectional Plies Predicted by Means

of a Percolation Concept. Compos Part A 2019;117:317-23.

Elnekhaily S, Talreja, R. Effect of Axial Shear and Transverse Tension on Early Failure Events in

Unidirectional Polymer Matrix Composites Compos Part A 2019;119:275-87.

Okabe T, Imamura H, Sato Y, Higuchi R, Koyanagi J, Talreja R. Experimental and Numerical

Studies of Initial Cracking in CFRP Cross-Ply Laminates. Compos Part A 2015;68:81-89.

Sudhir A, Talreja R. Simulation of Manufacturing Induced Fiber Clustering and Matrix Voids

and Their Effect on Transverse Crack Formation in Unidirectional Composites. Compos Part A

;127:105620.

Watanabe T, Takeichi Y, Niwa Y, Hojo M, Kimura M. Nanoscale in situ observations of crack

initiation and propagation in carbon fiber/epoxy composites using synchrotron radiation X-ray

computed tomography. Compos Sci Techno 2020;197:108244.

Mortell DJ, Tanner DA, McCarthy CT. A virtual experimental approach to microscale composites

testing. Compos Struct 2017;171:1-9.

Zhang X, Brandyberry DR, Geubelle PH. IGFEM-based shape sensitivity analysis of the transverse

failure of a composite laminate. Comput Mech 2019;64(5):1455-72.

Herr´aez M, Mora D, Naya F, Lopes CS, Gonz´alez C, Llorca J. Transverse cracking of cross-ply

laminates: A computational micromechanics perspective. Compos Sci Technol 2015;110:196-

Sun Q, Zhou G, Tang H, Meng Z, Jain M, Su X, Han W. In-situ effect in cross-ply laminates

under various loading conditions analyzed with hybrid macro/micro-scale computational models.

Compos Struct 2021;261:113592.

TanW, Mart´ınez-Pa˜neda E. Phase field predictions of microscopic fracture and R-curve behaviour

of fibre-reinforced composites. Compos Sci Technol. 2021;202:108539.

Rafie A, Madadi H, Farrokhabadi A, Herr´aez M. In situ strength analysis of cross-ply composite

laminates containing defects and interleaved woven layer using a computational micromechanics

approach. Fatigue Fract Eng Mater Struct 2021;44(5):1225-40.


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