Result and Discussion of Static and Dynamic Analysis of Trabecular Bone

Abstract

Stress-strain analysis in multi-axial loading is considered then fatigue life prediction of trabecular bone is represented. Vertical model subjected to axial load is faced with lower stress amplitude and effective plastic strain as well. Effective plastic strain in trabecular bone is known as a crucial data for tracking crack nucleation point and damage behaviour under different types of load. Since Combination of axial and torsional load on trabecular bone make life of bone shorter than imposing each load separately, this part of study consider the trend of stress and strain within the structure. Volumetric strain and effective plastic strain data were combined to extract data for strain amplitude axis and number of cycles to failure data computed numerically used as number of cycles to failure for x-axis in four load amplitude. Since trabecular bone is not withstand against load as structure subjected to axial load can, so it would be expected that fatigue life in torsional load is decrease drastically in compare with axial load. In static analysis trabecular bone was subjected to axial load two parameter monitored which were stress versus volumetric strain and effective plastic strain that is the crucial factor of damage initiation within structure. Results show that trabecular bone subjected to axial load has considerable fatigue life which in 40 % of total load it reaches to 1226.80 cycles approximately, however, this value for torsional load reach to 42 cycles and for multi-axial 38 cycles. Torsional load known as the most effective load, which causes damage within struts and trabeculae.