Mode I stress-intensity factor measurements by the electrical strain gage.

Stress Intensity Factors of Multiple Radial Edge Cracks at a Circular Hole in an Infinite Plate Due to Rotating Heat Source

“…For example, Dally and Sanford [9] and Berger and Dally [10] have developed a strain gage method for stress intensity factors by measuring the strain at the vicinity of a crack tip using a usual strain gage. Kurosaki et al [11][12][13] extended this method using the five-element strain gage available on the market. However, this research has considered only the isothermal case.…”

“…Goshima et al [15][16] confirmed the adequacy of this technique by applying this technique to the measurement of transient thermal stresses of various disks under different heating conditions. In this article, we extend this technique to the measurement of the stress intensity factor due to transient thermal stresses with reference to the above strain-gage method for stress intensity factors [9][10][11][12][13]. As an actual experiment, when a wide steel plate with a cracked circular hole is partially heated by molten tin at the vicinity of the hole, the stress intensity factor at the crack tip is measured by the present strain-gage method.…”