The weak link in drop-test simulations

Computer experiments based on a drop-test model show that the ductile component in sample fracture is much reduced by a random factor—the weak link. The weak link (measuring a few mm) must be transverse to the sheet surface and in the direction of impact. The weak link may be the primary boundaries formed in melt solidification. These boundaries, which are rich in impurities, alloying elements, and nonmetallic inclusions, may be inherited by the hot-rolled metal. In some cases, their stability may result in impurity retardation.