International Journal of Fatigue ( IF 5.7 ) Pub Date : 2021-08-13 , DOI: 10.1016/j.ijfatigue.2021.106477 Prabhu Murugesan 1 , Youngbin Lim 2 , Sunghwan Jung 3 , Hyungyil Lee 1
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We propose to generate compressive residual stress at the crack tip in the bulk metal by introducing acoustic cavitation to the crack tip. We conducted experiments using pre-cracked specimens to measure compressive residual stress at the crack tip achieved by the acoustic cavitation. In the experiments, the pre-cracked metal specimens were subject to an acoustic load with a frequency of 20 kHz to introduce acoustic cavitation to the crack tip. We found that the acoustic cavitation generates a significant amount of compressive residual stress at the crack tip and the generated compressive residual stress effectively retarded the crack growth.
中文翻译：
使用声空化在大块金属裂纹尖端产生压缩残余应力
我们建议通过在裂纹尖端引入声空化，在块状金属的裂纹尖端产生压缩残余应力。我们使用预开裂的试样进行了实验，以测量由声空化产生的裂纹尖端的压缩残余应力。在实验中，预开裂的金属试样受到频率为 20 kHz 的声载荷，以将声空化引入裂纹尖端。我们发现声空化在裂纹尖端产生了大量的残余压应力，产生的残余压应力有效地延缓了裂纹的扩展。
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