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G100: General [Table of Contents] G300: Matrix cracking (short term) (ref. section 6 D)

DNV-OS-C501 Composite Components

[-] Sec.14: Calculation Example: Two Pressure Vessels
[-] G: Linear analysis of vessel for water without liner
[-] G200: Analysis procedure (ref. section 9 B)

Sec.14
G 200   Analysis procedure (ref. section 9 B)

Sec.14 G
201   The elastic properties without matrix cracking are needed here and were calculated in D104. The values are different at the beginning and the end of the life of the component.

Sec.14 G
Table G1 Elastic properties 
Property New component After 25 years in water 
E1 fibre 23.7 GPa 21.3 GPa 
E2 matrix 7.6 GPa 6.8 GPa 
n12 0.29 0.29 
G12 linear 3.2 GPa 2.9 GPa 



Sec.14 G
202   The following results are obtained from the stress and laminate theory analysis (without using a load factor):

Sec.14 G
Table G2 Results for vessel for water without liner 
General:  After 25 years in water, no matrix cracks 
Pressure MPa 1.48 
Diameter mm 250 
Thickness mm 6 
Average axial stress MPa 15.8 
Average hoop stress MPa 31.6 
Eaxial GPa 11.02 
Ehoop GPa 16.34 
   
±15o plies:   
e1 % 0.108 
e2 % 0.168 
e12 % 0.035 
s1 MPa 27.0 
s2 MPa 13.9 
s12 MPa 1.01 
   
±85o plies:   
e1 % 0.17 
e2 % 0.10 
e12 % 0.01 
s1 MPa 39.9 
s2 MPa 10.7 
s12 MPa 0.35 
   

The results are identical with the non-linear analysis (see F205).

Sec.14 G
203   For each ply the local stress and strain components are applied in the design criteria.

G100: General [Table of Contents] G300: Matrix cracking (short term) (ref. section 6 D)