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Micromechanical Aspects of Inception of Cracks in Articular Cartilage
Kafka, Vratislav
The inception of cracks that are observed on the surface of articular cartilage is explained by taking into account the microstructure: There are - under the surface - dense collagen fibers lying parallel to the surface of cartilage an orientated in one direction. It is shown that an impact loading can lead to rupture of these fibers and subsequent creation of cracks.
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The Common Mechanical Factor of Shape Memory
Kafka, Vratislav ; Vokoun, David
Shape memory is observed in elastic bodies, springs, bi-metals, in many mechanical actuators, such as thermostats and others, in many biological materials, and in special "shape memory alloys". It is shown that all systems or materials have one common factor: at least one elastic or thermoelastic continuous substructure, in the case of "shape memoryalloys" this substructure is on the atomic scale.
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