Fan Zaifeng, Rho Jae-Young
Department of Biomedical Engineering, ET330, University of Memphis, Memphis, Tennessee 38152, USA.
J Biomed Mater Res A. 2003 Oct 1;67(1):208-14. doi: 10.1002/jbm.a.10027.
The viscoelastic and time-dependent plastic effects on the nanoindentation measurement of osteonal lamella in a human cortical bone were investigated. The elastic modulus of osteonal lamella obtained from the quasi-static technique was strongly affected by the indentation rate and time-dependent plasticity. The effects of time-dependent plasticity can be diminished by multiple loading-unloading cycles and a long holding period at maximal load. After minimizing the contribution of time-dependent plasticity to unloading data, it was surprisingly found that the elastic modulus was proportional to indentation strain rate raised to the 0.06 power, which is similar to conventional test results.
研究了粘弹性和时间依赖性塑性对人皮质骨骨单位薄片纳米压痕测量的影响。通过准静态技术获得的骨单位薄片的弹性模量受压痕速率和时间依赖性塑性的强烈影响。时间依赖性塑性的影响可以通过多次加载-卸载循环和在最大载荷下的长时间保持来减小。在将时间依赖性塑性对卸载数据的贡献最小化之后，令人惊讶地发现弹性模量与压痕应变速率的0.06次方成正比，这与传统测试结果相似。
