Hardness Hardness Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. Some materials (e.g. metals) are harder than others (e.g. plastics, wood). Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: "scratch hardness", "indentation hardness", and "rebound hardness". Hardness is dependent on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity. Common examples of hard matter are ceramics, concrete, certain metals, and superhard materials, which can be contrasted with soft matter. There are three
Walter Janka judgement against him. At the same time a legal and journalistic displute flared between Janka and Wolfgang Harich about the details of those 1957 show trials. Janka's contribution to dramaturgy received recognition in the form of the Heinrich Greif Prize in 1990. On 16 December 1989 Janka was a member of the presidium at the of the SED (then in the process of transforming itself into the PDS / Party of Democratic Socialism / " Partei des Demokratischen Sozialismus") held in Berlin at the Dynamo Sports Hall. In 1990 he was a member of the "Council of Elders" of the