In non-destructive testing for cracks it is not sufficient to simply detect the presence of a defect, but it is essential to have an accurate measure of the depth.
ZSM-5, HY, and β zeolites were tested for cracking supercritical dodecane (SCD) in the presence and absence of supercritical water (SCW).
The objective of this study is to validate the permeability test method for cracked concrete specimens and investigate influential parameters on the test results.
The dynamic tests prove that, on the configurations tested and for crack velocities up to 100 m/s, the crack propagation velocity has a limited effect on the value of GIc.
Current practice of characterizing the growth of fatigue cracks on the basis of fracture mechanics primarily relies on fatigue tests for long cracks which are typically of several millimeters in length.
It is a non-destructive testing method for crack identification, and it is applicable to structures for which a structural analysis is available.
Boeing previously thought that its older 737s could manage 60,000 cycles before requiring thorough testing for hairline cracks that could lead to fatigue failures.
The prediction is made using a three-dimensional finite element model of a cold expanded hole combined with a Paris law fit to fatigue data derived from tests for corner cracks emanating from a plain hole.
