Q: I just read an article on repairing drywall at the joints, which I have a lot of. But in one room the wall is cracked in a diagonal -- sort of zigzag -- all the way down the wall. It really looks ...

Q: The walls in our 30-year-old house have developed cracks in a number of places where the pieces of Sheetrock butt. Also, in a couple of corners, one side of the tape has pulled. We want to paint, ...

Of various criteria for fracture at the root of a notch, the energy, local stress, and displacement criteria have limited validity. More appropriate is the history of both stress and strain over a ...