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DNV-OS-C501 Composite Components

Sec.13: Definitions, Abbreviations & Figures

B: Symbols and abbreviations

Sec.13
B. Symbols and abbreviations

Sec.13 B

Table B1 Definitions of symbols for variables
Variables
1,2,3	: ply, laminate, or core local co-ordinate system , 1 being the main direction
a	: half crack length
ai	: scalar
Ai,j	: matrix A components
[A]	: extensional stiffness matrix
b	: width
b'	: horizontal distance between faces NA for boxed beam
C	: swelling agent concentration coefficient
COV	: coefficient of variation
d	: vertical distance between faces neutral axis (NA)
D	: flexural rigidity
D0	: flexural rigidity of faces about the NA of the entire sandwich structure
e	: core width
{e}	: expansional strain field
E	: modulus of elasticity
ei	: general expansional strain
f	: correction factor - scalar
G	: shear modulus
	: strain energy release rate
h	: height of boxed beam
H	: anisotropy factor
I	: 2nd moment of area
k	: scalar
K	: stress intensity factor
l	: length
m	: surface mass
M	: moment
N	: in-plane load
Qi,j	: matrix Q components
[Q]	: stiffness matrix
R	: resistance
S	: shear stiffness, local or global structure response
SCF	: stress concentration factor
Si,j	: matrix S components
[S]	: transformed compliance matrix
t	: thickness
T	: transverse load, temperature
U	: strain energy
u,v,w	: displacement in (x,y,z)
V	: volume fraction
x,y,z	: global co-ordinate system
F	: failure criteria function
Y	: ratio between quantiles in the marginal distributions and extreme-value distributions
a	: thermal expansion coefficient
a	: loading mode factor
b	: thermal swelling coefficient, or boundary conditions factor
e	: direct strain, i.e. e1 in the main direction
	: strain to failure
{e}	: strain field
g	: shear strain
gF	: partial load factors
gFM	: partial load and resistance factor
gM	: partial resistance factors
gRd	: partial model factor, resistance component
gSd	: partial model factors, load component
µ	: mean value
n	: Poisson's ratio, i.e. major n12, minor n21
q	: ply angle
r	: density
s	: direct stress, i.e. s1 in the main direction, or standard deviation
	: strength, or stress to failure
{s}	: stress field
t	: shear stress, i.e. t12 (or s12 sometimes)
w	: angular velocity

Sec.13 B

Table B2 Definitions of subscripts
Subscripts
b	: bending effects
ben	: bending
c	: compression
core	: core
corrected	: value corrected by using a correction factor
cr	: critical
d	: design
Delam	: delamination
E(n)	: time curve
face	: face
Fibre	: fibre
i	: effects due to in-plane size of sandwich beam
ip	: effects due to in-plane size of sandwich panel
k	: characteristic value
Matrix	: matrix
max	: maximum
meas	: measured value
min	: minimum
nom	: nominal
ply	: ply
ref	: mean of the measured values
Shear	: shear
sl	: shear-loaded
SLS	: serviceability limit state
t	: tension
tc	: core thickness effects
typ	: typical value
ULS	: ultimate limit state

Sec.13 B

Table B3 definitions of superscripts
Superscripts
¯	: maximum direct or shear stress in the structure/component
^	: direct or shear stress of material at failure
*	: elastic or shear modulus of damaged face or core
nl	: non-linear
lin	: linear
0	: initial
1	: final
top	: top face
bottom	: bottom face

Sec.13 B

Table B4 Definitions of sub-subscripts
Sub-subscripts
lin	: proportional limit