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A Computer Controlled Filament Winding Technique for Manufacturing Cement Based Composite Laminates B. Mobasher, A. P. Pivacek, G. J. Haupt Dept. of Civil and Env. Engineering Arizona State University, Tempe, Arizona Sponsor: National Science Foundation, Grant #MSM9211063 ASCE, Materials Engineering Conference, Nov. 1996, Washington, D.C.

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Cement Based Angle-Ply Laminate Composites B. Mobasher, A. P. Pivacek, G. J. Haupt Dept. of Civil and Env. Engineering Arizona State University, Tempe, Arizona MRS, Materials Research Society, Dec. 1996 Boston, MA. Sponsor: National Science Foundation, Grant #MSM9211063


Scope of Presentation  

   

Reinforcing Mechanisms New Processing Developments – Filament Winding Experimental Program Composite Laminates Results and Discussions Conclusions


Reinforcement Due to Short Fibers  

  

Toughening Fiber debonding and frictional pullout Bridging, closing pressure Crack face stiffness Stress intensity reduction Fiber


Toughening Due to Long Fibers    





True composite effect of fibers Fibers carry majority of the force BMC- Distributed cracking Limited debonding due to low shear stresses. debonding leads to crack deflection. Design of the material based on the applied loading.


Fiber

New Manufacturing Techniques for FRC Materials 

Pultrusion – continuous fiber composites, cross sections, 1-D



Filament Winding – Various shapes and orientations



Computer controlled system



– Versatile Manufacturing System Cross ply and angle ply laminates Pipes




Filament Winding Setup


Mold for a Cross ply laminate


Mandrel for pipes


Computer controlled Pultrusion/filament winding set up


Software  



Object oriented software Easily changed for various configurations. Control 4 motors in a closed loop mode by specifying displacement, velocity, acceleration, and force per channel


Fiber Properties

Fiber

Lf mm

Glass (AR) PP

cont. 12.0

df micron 12 35x250

Ultimate Strength (MPa) 500 340-500


Elastic Modulus (GPa) 70

Density (g/cm 3 )

8.5-12.5

0.91

2.0

Matrix Formulation    

 

Type I Portland Cement Silica fume 10% by weight of cement w/c = 0.35 Mixing in a high energy of the paste in an omni mixer. 28 days curing at 70F 90% RH Superplasticizer (as specified).


Unidirectional Lamina 0 degree - 3 plies 50 40 Stress, MPa

30

Continuous aligned fibers, V= 4.8% f

20 10

GFRC, V = 5% f

0 0.000 0.002 0.004 0.006 0.008 0.010 Strain, mm/mm You created this PDF from an application that is not licensed to print to novaPDF printer (http://www.novapdf.com)

Flexural Response 40

Equivalent Flexural 30 Stress, MPa

Unidirectional

20

0-90-0

10 Paste

4.8% Continuous AR Glass Fibers

0 0

4

8 12 Deflection, mm


16

20

Cross ply Laminates 0-90-0 30 0-90-0 20 Stress, MPa

10

0 0.000

0.004 0.008 0.012 Strain, mm/mm


0.016

Cross ply Laminates 90-0-90 40 90-0-90 30

Pressed

Stress, MPa 20 Not Pressed 10

0 0.000

0.004

0.008

0.012

Strain, mm/mm You created this PDF from an application that is not licensed to print to novaPDF printer (http://www.novapdf.com)

0.016

0.020

Unidirectional PP based laminates 20

PP #5

Stress (MPa)

16 12 8 4 0 0.00

0.02

0.04 0.06 0.08 Strain (mm/mm)


0.10

Unidirectional PP based laminates 16

S tress (M Pa)

12

8

4

0 0.00

PP, Volume fraction=7%

0.01 0.02 Strain (mm/mm)


0.03

Glass Fiber Reinforced Pipe


Microcraking in a 0-90-0 laminate


Summary of Tension Results lay up

0

0/90/0

0/90/90/0

90/0/90

# E, G Pa repl.

9

4

5

4

stress at BO P, MPa

strain at BO P

Ultimate strength MPa

21.22

13.72

1.09E-03

44.6

1.27E-02

(5.54)

(9.81)

(1.39E-03)

(6.1)

(1.77E-02)

10.2

5.17

6.43E-04

23.1

1.44E-02

(0.85)

(0.98)

(2.30E-04)

(4.5)

(3.07E-03)

21.6

9.86

6.08E-04

41.1

2.29E-02

(4.96)

(1.10)

(5.05E-04)

(6.2)

(8.24E-03)

8.54

13.20

1.51E-02

31.5

1.44E-02

(4.5)

(4.81)

(2.40E-02)

(7.0)

(6.90E-02)


Ultimate Strain, mm/m m

Conclusions  



  



Development of cement based composite lamina and laminates. Tensile strengths of the order of 50 MPa and strain capacity on excess of 1% Polymeric and synthetic fibers alter the properties of the composites significantly. High energy mixing can incorporate high volume of fibers. Uniform fiber distribution at various size scales. Alumina fibers stabilize the microcracks and increase the strength. Polypropylene fibers and hybrid composites increase the toughness.


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