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 (LaSrCoFeO). 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.

本研究调查了通过球形压痕评估铁弹性力学特性的可能性。使用典型的铁弹性氧化物（La Sr Co FeO）。仿真结果表明，在压入载荷-深度曲线中无法观察到铁弹性力学行为，但在压入应力-压入应变曲线中可以清楚地观察到，在实验中通过使用载荷-局部卸载估算接触半径可以可靠地获得铁弹性力学行为。序列。当压入应力在较高的铁弹性临界应力之下时，该方法是可靠的。因此，尽管在实际实验中很难满足这些要求，但原则上可以通过使用部分卸载估算压痕应力与压痕应变曲线的球形压痕，通过球形压痕来评估铁弹性力学特性。