Notation

Op

Additional assembly process risk

cP

Process capability index (centred distributions)

Cpk

Process capability index (shifted distributions)

Cv

Coefficient of variation

D

FMEA Detectability Rating

f

Frequency

f (x)

Function of x, probability density function

F (x)

Cumulative distribution function

fp

Fitting process risk

gp

Geometry to process risk

hp

Handling process risk

k

Number of classes

kp

Surface engineering process risk

K

Stress intensity factor

Kc

Fracture toughness

Kt

Stress concentration factor

L

Loading stress

Ln

Nearest tolerance limit

m

Number of components in the system

mp

Material to process risk

n

Number of components in an assembly stack, number of load applications

N

Population

Np

Number of data pairs

O

FMEA Occurrence Rating

P

Probability of failure per application of load

P

Probability, probability of failure

Pc

Product cost

Component assembly variability risk

qm

Component manufacturing variability risk

r

Correlation coefficient

R

Reliability

Rn

Reliability at nth application of load

S

Principal stress

Surface roughness to process risk

s

FMEA Severity Rating, strength

Su

Ultimate tensile strength

Sy

Uniaxial yield strength

t

Bilateral tolerance

T

Unilateral tolerance

tp

Tolerance to process risk

V

Variance

w

Class width

z

Standard deviation multiplier, Standard Normal variate

<K)

Function of

^SND

Function of the Standard Normal Distribution

M

Mean

a

Standard deviation

i a

Standard deviation estimate for a shifted distribution

S

Sum of

Tu

Ultimate shear strength

Ty

Shear yield strength

0 0

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