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As the crack grows, the load relaxes, and this wins over the effect of increasing crack length, so that the stress intensity decreases. If the correct initial load is selected, the DCB test has the potential for giving an answer in one test, which is quite an advantage over a series of fixed load tests to define a threshold.

This only works, however, if the correct load is selected — high enough to get a crack moving, but not so high that the crack runs too far, and the test becomes invalid. Test durations using DCB tests are also reduced compared to other methods because the standard test duration is half that of fixed load tests in TM That is, however, a slight concern as, if the crack has not arrested at 14 days, then the result will be un-conservative.

Tests may be on fully machined specimens or with, for example, weld details intact. If this type of test is specified, check which test method the client really intends. Support for SMEs. Software Products. Go to Technical knowledge Search. Patri Go. Jo Jo ToMo. Alejandra Daza. CMD KamiKaze. Cristian Gomez. Tabla comparativa sistema GYF area de almacenamiento R. Miguel Duran Gonzalez. Martin Guillen. Luis Antonio Vargas Moreno.

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