MECHANLCAL FAILURE IN HAVERSIAN SYSTEMS ON THE BASIS OF MICROSTRUCTURE

Abstract

Abstract: The aim of this paper is to observe variations in the mechanical properties of Haversian systems including Haversian lamellae and canals,by means of the compressive test of five bone specimens subjected to different loads corresponding to 2KN,3KN,dKN,5KN and 6KN respectively. From a series of related microscopic pictures it is clearly seen that:(1) in the lower level of loading (2KN) ,the Haversian canals much the same as the one unsubjected to loads,and conditions of Harversian lamellae are also the same,but,the individual Harversian canal was slightly bent; (2) in the case of the higher levels of loading,it is first deformed in the weaked portion of the Haversian lamellae; (3) with increasing loads,the fracture shapes of the Haversian system are very complex,but the fractures always take place in the cement line between osteons.At the same time,deformed dimensions of the Harversian lamellae and canals were measured. The observed phenomena were qualitatively interpreted by the theory of the linear viscoelas-ticity.

Key words: cohesive element, cohesive zone model (CZM), cohesive law, separation work analysis, consistently coupled rule/principle, consistently coupled cohesive (CCC) law, non-consistently coupled cohesive law

Sun Jia -ju;Geng Jie;Zhang Xiao-ru. MECHANLCAL FAILURE IN HAVERSIAN SYSTEMS ON THE BASIS OF MICROSTRUCTURE. Applied Mathematics and Mechanics (English Edition), 1984, 5(5): 1639-1649.

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