TABLE OF CONTENTS The design of composite structures, needs a different approach than what is used for metal structure. It needs a process that is homed in on innovation and safety as explicit requirements, and which is adaptable to a "never-ending-stream" of new materials, processes and structural concepts. It must promote explicit safety requirements, compensate for the frequent lack of service experience, and center on "Safe Flights."
The probability of a safe flight involves the probability of preserved structural integrity, which is a very important aspect of structural design. The probability can be written for damage tolerance critical structure as,
where the first term on the right-hand side represents "aging." For cases without degradation the probability of lost integrity can be written as,
The events are:
B l: RS > LLR;
D 6: D s > MAD;
X: Damage is not present at the location.
Example 10.1 shows potential orders of magnitude and illustrates how in the design process damage resistance becomes the starting point in target setting.
This example works with a modification of Eq. (10.2) as follows,
The terms in the sum will be assessed first,
| i | 1st factor | 2nd factor | Product | Total |
| 1 2 | 0.889 | 10 ?6 | 0 | |
| 3 | 0.001 | 0.1 | 10 ?4 | |
| 4 | 0.01 | 0.01 | 10 ?4 | |
| 5 | 0.1 | 0.001 | 10 ?4 | |
| 3 10 ?4 |
The total value of the Eq. (10.3),
where P( D 6 X) is a set equal...
