Cracked heels are splitting or cracking of the heels due to dryness or thickening of the skin (callus). Callus around the circumference of the heel is the beginning process of cracking. Increased pressure on the fat cushion beneath the heel causes it to expand sideways, leading to cracking of...
splitting tensile cracks along the foliation plane and lead to failure of the specimen. As shown inFigure 16, the fracture surface across the foliation plane is relatively rough but that along the foliation plane is flat. There are many broken flaky mineral particles in the fracture surface ...