基于3D-ILC超声场致脆性固体单内裂纹扩展规律研究

doi:10.13722/j.cnki.jrme.2019.0741

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Abstract In order to reveal the evolution of crack propagation and penetration in brittle solids under the action of ultrasonic field，the 3D-ILC method is introduced to ultrasonic fracturing tests for the first time，with different excitation durations and ultrasonic powers. The ultrasonic fracturing mechanism was revealed by analyzing the characteristics of fracture surfaces. The crack propagation path under different ultrasonic parameters was obtained through numerical simulation based on the Paris fatigue model and compared with the experimental results. The results show that 3D-ILC method is a powerful tool for ultrasonic fracturing research. Under the action of ultrasonic filed，cracks propagate along the tip，and the fracture surface shows the characteristics of shellfish veins and has powder locally. It can be judged that the ultrasonic fracturing mechanism includes ultra-high cycle/high cycle fatigue fracture，friction and temperature load. Ultrasonic action on solids is concentrated on original pre-cracked surfaces and no damage occurs in the intact region，which indicates that the ultrasonic action has “crack priority”. The area of crack propagation is positively correlated with the ultrasonic action time and ultrasonic power. Numerical simulation using the Paris fatigue model reveals that crack propagation is proportional to load amplitude and cycle number and that the crack propagation path is consistent with the test results. 3D-ILC provides a new means for the experimental and theoretical research of ultrasonic fracturing. Compared to traditional numerical methods based on the analysis of stress-strain and plastic zone，adopting numerical simulation to obtain the crack path under ultrasonic fracturing provides a good complement.

Key words： rock mechanics rock-like material 3D-ILC ultrasonic fatigue 3D internal crack fracture mechanics very high cycle fatigue(VHCF)

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	Articles by authors
	WANG Haijun1
	YU Shuyang2
	LI Hanzhang1
	REN Ran3
	TANG Lei1
	ZHU Wenwei2

Cite this article:

WANG Haijun1,YU Shuyang2,LI Hanzhang1, et al. Ultrasonic fracturing of brittle solids with an internal crack based on 3D-ILC method[J]. , 2020, 39(5): 938-948.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0741 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I5/938

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