Thermoelastic Interference between Two Neighboring Cracks (Cracks Cooled at Prescribed Temperatures)

Falling Between the Cracks

Interface Cracks

-Properties of elastic solutions to interface crack problems are discussed in both the open formulation, in which the crack faces are assumed to be traction-free and interpenetration is permitted, and the unilateral formulation, where a contact zone is generally established adjacent to the crack tips. It is shown that if the contact zone is sufficiently small compared with the other dimensions ...

Mapping Flat Cracks onto Penny-shaped Cracks, with Application to Somewhat Circular Tensile Cracks

Consider a three-dimensional homogeneous isotropic elastic solid containing a flat pressurized crack, fi. The problem of finding the resulting stress distribution can be reduced to a hypersingular integral equation over Q for the crack-opening displacement. Here, this equation is transformed into a similar equation over a circular region D, using a conformal mapping between Q and D. This new eq...

Universal shapes formed by two interacting cracks.

We investigate the origins of the widely observed "en passant" crack pattern, which forms through interactions between two approaching cracks. A rectangular elastic plate is notched on each long side and then subjected to quasistatic uniaxial strain from the short side. The two cracks propagate along approximately straight paths until they pass each other, after which they curve and release a l...

Revalidation: cracks at first, now chasms.

On 8 June 2005, Professor Mike Pringle gave the 2005 John Fry Fellowship Lecture, organised by the Nuffield Trust in London. He called it ‘Revalidation of doctors: the credibility challenge’. The audience was, in sections, invited and alert, great and good, knighted and elevated, yet some were fidgety and irritated. At the end, we were all stunned in part, taken aback at times, but on the whole...