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An Assessment of Remote Visual Testing
System Capabilities for the Detection of
Service Induced Cracking

Table 1 Crack opening dimensions for various service induced cracks
Crack Type	Smallest	Medium	Largest	Source
Interganular stress corrosion	5 µm (2 x 10-4 in.)	30 µm (1.2 x 10-3 in.)	107 µm (4.2 x 10-3 in.)	Ekstöm and Wåle, 1995
Mechanical Fatigue	3 µm (1 x 10-4 in.)	18  µm (7 x 10-4 in.)	250 µm (9.8 x 10-3 in.)	Ekstöm and Wåle, 1995
Stress Corrosion	5 µm (2 x 10-4 in.)	42 µm (1.7 x 10-3 in.)	310 µm (1.22 x 10-2 in.)	MacDonald, 1985
Stress Corrosion	10 µm (4 x 10-4 in.)	45 µm (1.8 x 10-3 in.)	380 µm (1.5 x 10-2 in.)	Lapides, 1985
Stress Corrosion	18 µm (7 x 10-4 in.)	37 µm (1.4 x 10-3 in.)	54 µm (2.1 x 10-3 in.)	Stenefjall, 1985
Thermal Fatigue	5 µm (2 x 10-4 in.)	28 µm (1.1 x 10-3 in.)	380 µm (1.5 x 10-2 in.)	Ekstöm and Wåle, 1995

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