Materials Science

Better fatigue resistance at low cost

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Science  06 Dec 2019:
Vol. 366, Issue 6470, pp. 1210-1211
DOI: 10.1126/science.366.6470.1210-e

Framework or microarchitectured materials can be designed to have a combination of strength and stiffness, not through changes in the underlying material but through variations in lattice density and architecture. By looking at the properties of cancellous bone, which is better than compact bone for stress dampening, Torres et al. explored ways to enhance the fatigue properties of microarchitectured materials. They found that a key element is the proportion of materials oriented transverse to the applied loads, because these materials act as sacrificial elements during cycling loading. Thus, although there is a tendency to design framework materials to maximize the struts oriented in the direction of expected loading, this can lead to a drastic loss of fatigue resistance and only minimal decrease in the overall density.

Proc. Natl. Acad. Sci. U.S.A. 10.1073/pnas.1905814116 (2019).

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