Crack Detection and Crack Propagation Gages

Crack Detection and Crack Propagation Gages Structural test labs often need to test structures to failure, stopping the applied load once a surface crack has formed in the part. In some applications, thin copper wires (commonly 44 AWG) bonded to the test structure are used to provide a low-cost method […]

Crack Detection and Crack Propagation Gages

Structural test labs often need to test structures to failure, stopping the applied load once a surface crack has formed in the part. In some applications, thin copper wires (commonly 44 AWG) bonded to the test structure are used to provide a low-cost method of detecting crack initiation or propagation. Because of the behavior of copper wire, and the general size relative to strain-gage-type rolled foil, this method suffers from two limitations: (a) the crack tip may progress considerably beyond the wire without breaking the strand, and (b) in areas of high cyclic strains, the wire may fail in fatigue without crack initiation in the specimen. CD-Series Crack Detection Gages are designed to overcome both of these limitations.

Pattern Datasheet Strain Gage Pattern Image Gage Geometry Gage Series Gage Resistance Gage Length Overall Pattern Length Grid Width Overall Pattern Width Matrix Length Matrix Width
CD
CD 0.56 0.10 0.60 0.13
0.76 0.80
0.96 1.00
1.16 1.20
2.16 2.22
CPA01
TK 5 1.00 0.20 1.08 0.28
CPA02
TK 5 2.00 0.40 2.08 0.48
CPB02
TK 5 0.50 0.10 0.56 0.16
CPC03
TK 3 1.57 0.75 0.80 1.62
CPD01
TK 110 1.00 1.00 1.11 1.11

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