Can ferrroelasticity be evaluated by nanoindentation?
Can ferrroelasticity be evaluated by nanoindentation?
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DOI：
10.1016/j.jeurceramsoc.2018.05.030
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发表时间：
2018-10
影响因子：
5.7
通讯作者：
W. Araki;Xin Wang;A. Atkinson
中科院分区：
文献类型：
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作者：
W. Araki;Xin Wang;A. Atkinson
本研究探讨了球形压痕法评价铁弹力学特性的可能性。利用典型铁弹氧化物（LasinglebondSrsinglebondCo singlebondFesinglebondO）的特征体数据，对铁弹塑性材料的球形压痕进行了有限元模拟.模拟结果表明，铁弹力学行为不能观察到的压痕载荷-深度曲线，但可以清楚地观察到压痕应力-压痕应变曲线，这可以在实验中可靠地通过估计接触半径使用加载部分卸载序列。当压入应力低于铁弹性临界应力上限时，该方法是可靠的。因此，原则上可以通过球形压痕来评估铁弹性力学特性，通过部分卸载获得压痕应力与压痕应变曲线来估计接触半径，尽管在实际实验中很难满足这一要求。
The present study investigated the possibility of evaluating ferroelastic mechanical characteristics by spherical indentation. Finite element simulation of spherical indentation, with a relatively large sphere, of a ferroelastic-plastic material was performed using characteristic bulk data of a typical ferroelastic oxide (Lasingle bondSrsingle bondCosingle bondFesingle bondO). The simulation results showed that the ferroelastic mechanical behaviour cannot be observed in the indentation load vs depth curve, but is clearly observable in the indentation stress vs indentation strain curve, which can be obtained reliably in experiments by estimating the contact radius using load-partial unloading sequences. The method can be reliable when the indentation stress is under the upper ferroelastic critical stress. Therefore, in principle ferroelastic mechanical characteristics could be evaluated by spherical indentation by obtaining the indentation stress vs indentation strain curve using partial unloading to estimate the contact radius, although the requirements are very difficult to satisfy in actual experiments.