Environmental Engineering Reference
In-Depth Information
Taking into account the actual operating loads and conditions determined
for the products by fracture mechanics methods, the size of the following
discontinuities is determined:
• critical,
• suitable for operation,
• suitable for manufacture (the norms of defects in the component) on
the basis of the current valid standard documents and/or Technical
Instructions for manufacture.
For the selected product, it is necessary to define the probability of
the existence of defects, determining its quality, reliability and safety (the
regulatory requirements for its quality, reliability, safety). At the same
defects that determine the quality are the defects whose sizes range from
the minimum sizes allowable for detection of defects (search) to the size of
defects that are allowed in manufacturing and larger; defects determining
the reliability - the defects whose sizes are in the range from rejection
in manufacture to an acceptable level for operation and larger; defects
determining the safety - ranging from allowable in operation to the critical
size and larger.
This probability is given on the basis of socio-economic requirements
for safety and reliability of products, taking into account possibilities of the
current level of technology, and may be called the regulatory requirements
for quality, reliability and product safety.
Further, the regulatory curve is plotted in the coordinates lg
P
-c for the
state of the product, which reflects the given probability requirements for
[
c
]
cr
[
c
]
man
[
c
]
ser
6.9
Comparison of the curves of residual defectiveness after
manufacture 3, after inspection and repair of detected defects 2
with the regulatory curves of residual defectiveness 1.
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