Fracture toughness measures a material's resistance to crack advance. In a thin elastic plate model, the threshold for advance can be represented by a prescribed front curvature . Such a curvature parameter is not numerically interchangeable with a bulk fracture-toughness parameter without specifying the fracture model.
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Fracture toughness is a property of materials that measures their ability to resist crack propagation when subjected to stress. It quantifies the material's resistance to fracture in the presence of pre-existing flaws such as cracks or voids. Fracture toughness is expressed as a critical stress intensity factor (K_c), which combines the effects of the applied stress, the size of the crack, and the material's properties.