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Delamination behavior of L-shaped composite beam with manufacturing defects

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Abstract

Composite structures are more susceptible to manufacturing defects than conventional materials. Fiber misalignment, cracks, and voids are typical types of manufacturing defects in laminated composites. Defects can greatly reduce structural integrity and load carrying capacity, so their effects on material and structural strengths must be understood. In this paper, the effect of manufacturing defects on the progressive delamination behavior was studied for carbon/epoxy composite laminated L-beam under four-point bending test conditions. The defects of wavy plies and pure resin that had flowed out were characterized from surface photography and then transformed into finite element modeling using semi-automatic approach to which pre-delamination and void were included. Next, progressive failure analyses were performed with the interface delamination and matrix direction failure accounted for by cohesive zone modeling. Numerical results were examined focusing on the effects of defects on the peak load reduction and the variation of delamination pattern. The stacking sequence effect was also investigated.

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Abbreviations

a 0 :

Length of pre-delamination

E :

Young’s modulus

G :

Shear modulus

G IC G IIC :

Mode-I and mode-II fracture energy

Icz :

Length of cohesive zone

I v :

Void length

P :

Applied vertical load

P max :

Peak load

Ri, Ro :

Measured inner and outer radii

R 5/6 :

Measured radius of interface 5/6

r o :

Model outer radius

s :

Shift of pre-delamination in length direction

\(T_n^0,T_s^0\) :

Maximum tractions in normal and shear directions

t :

Specimen ply thickness

t n :

Nominal ply thickness

t r :

Pure resin thickness

t v :

Void thickness

\(\overline {\rm{w}} \) :

Applied vertical displacement

η :

B-K mixed mode parameter

v :

Poisson’s ratio

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Authors and Affiliations

  1. School of Civil Engineering, Chungbuk National University, Cheongju, Korea

    Kyeongsik Woo

  2. Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Ningbo, China

    Biruk F. Nega

  3. Department of Mechanical & Industrial Engineering, Montana State University, Bozeman, MT, USA

    Douglas S. Cairns

  4. Global Engineering and Materials, Inc., Princeton, NJ, USA

    Jim Lua

Authors
  1. Kyeongsik Woo
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  2. Biruk F. Nega
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  3. Douglas S. Cairns
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  4. Jim Lua
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Correspondence to Kyeongsik Woo.

Additional information

Kyeongsik Woo is a Professor of School of Civil Engineering at Chungbuk National University, Korea. He received his Ph.D. in Aerospace Engineering from Texas A&M University. His research interests include textile composites, fracture simulation using CDM and CZM methods, high velocity impact behavior of composite materials, effect of defects in composite materials and fluid-structure interaction problems.

Biruk Fikre Nega received his B.Sc. degree in Civil and Urban Engineering from Arba Minch University, Ethiopia (2013) and M.Eng. in Computational Structural Engineering from Chungbuk National University, Korea (2018). Currently he is a Ph.D. student in the Department of Mechanical, Materials and Manufacturing Engineering at the University of Nottingham, Ningbo, China. His research interests are directed fiber preforming processes and predictive computational modeling of laminated, textile and discontinuous fiber composite under static and dynamic loading conditions.

Douglas S. Cairns is the Lylse A. Wood Distinguished Professor at Montana State University. He has over 39 years’ experience in the design, analysis, manufacturing, and testing of composite materials and structures. He received his Ph.D. from MIT Aeronautics and Astronautics, scale and M.S. M.E. and BSME from University of Wyoming.

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Woo, K., Nega, B.F., Cairns, D.S. et al. Delamination behavior of L-shaped composite beam with manufacturing defects. J Mech Sci Technol 34, 3709–3720 (2020). https://doi.org/10.1007/s12206-020-0823-y

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  • DOI: https://doi.org/10.1007/s12206-020-0823-y

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