本實驗主要針對3Y氧化鋯試片進行單軸向壓應力循環負載和潛變實驗，並將每一應力增量下之即時楊氏模數、即時波松比值和即時體積模數與材料的彈性楊氏模數、彈性波松比值和彈性體積模數相互比較，藉此研究分析各種壓應力下所呈現出之韌化機制為何，而實驗試片為骨頭狀外型且可以承受平面應力負載之薄片。
結果顯示於正方相氧化鋯試片中，存在著誘發顯著相變化的應力門檻。當施加應力高於此門檻時，發生相變化的強度可能會隨著循環次數增加而增加。並且試片在高於應力門檻潛變，潛變後的循環負載誘發相變化的強度會明顯比潛變前的循環負載來的大。此外於加載過程中所誘發出的相變化會在持續加載應力與隨後卸載應力的過程中部份或完全的逆轉回來，倘若僅有部分逆轉，則會在應力解除時完全逆轉回來。

Specimens of 3Y-ZrO2 are in the form of thin plate to ensure a plane stress loading appearing in the central working area of specimens. They are subjected to cyclic loadings of uniaxial compressive stress which are interleaved with creeping at both the upper and lower limits of a loading cycle. The occurring intensity of various toughening mechanisms at different stress levels is analyzed by comparing the fluctuation of the instantaneous Young’s modulus, instantaneous Poisson’s ratio and instantaneous bulk modulus with elastic moduli.

Experimental results show that there exists a ‘stress threshold for initiating significant phase transformation’ in 3Y-ZrO2 specimens. After creeping at the upper limit which is beyond the stress threshold, the intensity of phase transformation increases in the ensuing cyclic loadings. This intensity raises as the number of cyclic loading increases. Phase transformation occurring in the loading path is reversed partially or completely in the loading and unloading paths. If partially, the rest will be reversed when the load is released.

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