PSI - Issue 42

Aleksandr Shalimov et al. / Procedia Structural Integrity 42 (2022) 1153–1158 A. Shalimov et al. / Structural Integrity Procedia 00 (2019) 000 – 000

1157

5

Structure 1

Structure 5

Tension

а)

Compression

b)

Fig. 3. Field of degradation-coefficient values for numerical implementations of structures 1 and 5: (a) tensile loading, (b) compressive loading

The areas of degradation of elastic properties are located in the vicinity of stress concentrators. The number of these areas is much greater under tensile loading than under compressive one. It is shown that the studied bone structures resisted compression more effectively than tension. The load-displacement curve for tensile loading differs from that for compressive one only in terms of its curvature and a more nonlinear character (Fig. 3). This is due to the fact that in tensile loading the areas of property degradation are considerably larger, and also the degradation coefficient is almost twice as high. Conclusion The unit cells of the trabecular-bone microstructure obtained using high-resolution computed tomography were examined. The stress-strain state during tension and compression of numerical realizations of the structures was investigated using an elastic property degradation model. The effective stiffness of the structure directly influenced the resulting reaction force in the model. Acknowledgements The authors gratefully acknowledge financial support under the Mega-grants program, contract no. 075-15-2021-