Increased fatigue strength of partially stabilised zirconia achieved by shot peening
Increased fatigue strength of partially stabilised zirconia achieved by shot peening
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DOI：
10.1080/02670836.2016.1242271
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发表时间：
2017-03
影响因子：
1.8
通讯作者：
K. Takahashi;K. Iwanaka;H. Koike
中科院分区：
文献类型：
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作者：
K. Takahashi;K. Iwanaka;H. Koike
研究了喷丸处理对部分稳定氧化锆疲劳强度的影响。对光滑试样和含有深度在35-110 μm范围内的表面预裂纹的试样进行SP。使用三点弯曲装置进行循环疲劳试验。SP在试样上引入了压缩残余应力，并提高了它们的疲劳强度。预裂纹深度≤ 50 μm的喷丸试样在预裂纹区域外断裂，表现出相当高的疲劳极限，与喷丸光滑试样相当。因此，SP可以使深度≤ 50 μm的预裂纹变得无害，这一点得到了基于断裂力学的理论估计的证实。
The effects of shot peening (SP) on the fatigue strength of partially stabilised zirconia were studied. Smooth specimens and specimens containing a surface pre-crack with depths in the range 35–110 μm were subjected to SP. The cyclic fatigue tests were performed using a three-point bending setup. SP introduced compressive residual stresses on the specimens and improved their fatigue strengths. The shot peened specimens with pre-crack depths ≤ 50 μm fractured outside the pre-crack area and exhibited considerably high fatigue limits, equivalent to those of the shot peened smooth specimens. Therefore, the pre-cracks with depths ≤ 50 μm could be rendered harmless by SP, which was confirmed by the theoretical estimations based on fracture mechanics.