2005 2

A simple estimate of laminated composite materials’ strength characteristics

∗

Nguyen Duy SINH

∗ ( : )

3

Key Words : composite materials, laminate, strength characteristics, layers debonding

1.FRP

(CFRP)(GFRP) CFRP GFRP

FRPFRP

2.

C̄ = CM {CM − (1 − f) (CM − CI) S}−1

× [CM − (CM − C I)] {S − f (S − I)}f CI CM

S

Eshelby

31)

3.

B1 B5 F1 F5 H1H5 2)

–1H1

4.

(1)–2

–3x

θ = 0◦

5%

(2)–

4 ((G2)4)

θ = 0◦ θ = 90◦

(3)–5

–6y

10%(4)

–7

(1)

y

x

z

–1 H1 (G1/G3/G2)S

q

xLΔ

xLΔ

x

x

L

qLEx =

–2

25

50

B4−DF1−DH2−A

0◦ (GPa)

B1−AB3−DH1−EB2−EB5−A

–3

5.0 10 150

5

10

15

θ = 0◦

θ = 15◦

θ = 30◦

θ = 45◦

θ = 60◦

θ = 75◦θ = 90◦

Eθ(GPa)

Eθ(GPa)

–4 4

P

ω

ω3

3

xxPLEI =

xL

–5

100

200

F1−EF3−DH5−D

y EI(GPa/m)

H1−AH2−AH3−AH5−A

–6

P15

3.3

10

ω

–7 3 (mm)

0.2 0.40

20

40 τmax(MPa)

ω(mm)

–8 F1

170

6

15P/2P/2

ω

–9 4 (mm)

10 200

100

200

300

400 (MPa)

ω(mm)

–10 F2

–8 F1

F1G2 G3F1 G2 G3

F1

(5)

–94 –10 F2

5.

5 10%

1)

3 ,

Vol. 51A, 2005.

2) FRP .:

(GF/CF)FRP ,

, 1984.

(2005 2 15 )

(2)