Fracture
Toughness, KIc and CTOD
The program provides data acquisition and results
analysis for fracture toughness testing of compact tension or three-point
bend specimens to meet ASTM E399 or BS 7448 : Part 1. If the test
machine is manually operated, both the cross-head and stress rates
are displayed on the screen providing visual aid to comply with the
standards. If the test machine has an external input, then the program
controls the cross-head rate in order to achieve loading rates stated
in the standards. After the test is finished, the modulus of elasticity
is drawn. Depending on the test requirements, either the 5% secant
line is drawn to calculate the fracture toughness (KIc), or the parallel
offset at Pmax is drawn to give the critical crack tip opening displacement
(CTOD) or the area under the curve is calculated to yield the critical
J fracture toughness, or any combination.
The results can be printed either in graphical form or text form,
either on an inkjet or laser printer. Test data is stored for future
analysis, enabling to re-calculate the results at a later date. Test
data can also be stored as a text file in order to use spreadsheet
program facilities. |
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