爆炸载荷下I型裂纹的起裂及扩展规律研究

doi:10.13722/j.cnki.jrme.2017.1126

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摘要为了研究爆炸载荷作用下I型裂纹的断裂韧度参数及扩展规律，首次将裂纹扩展计(crack propagation gauge，CPG)和内部单裂纹圆盘(single internal crack circular disc，SICCD)试件引入到爆炸载荷下的韧度测试中。试验采用了大尺寸PMMA试件和示波器、超动态应变仪搭接的测试系统，并利用动态有限差分软件AUTODYN和有限元软件ABAQUS建立数值计算模型，通过试验–数值法得出I型裂纹的裂纹扩展速度、动态起裂韧度、扩展韧度及止裂韧度等断裂参数。试验结果表明：(1) 预制裂纹在扩展过程中，扩展路径出现拐点时，会产生明显的止裂现象，当裂纹再次起裂时，速度会明显上升。(2) CPG能够更加精准地监测裂纹的扩展规律，结合试验–数值法能够很好地计算出裂纹的起裂韧度等动态参数，为爆炸试验断裂参数的获取提供了一种新型的测试方法。(3) 初步的分析表明爆炸载荷下动态止裂韧度要大于动态起裂韧度和动态扩展韧度。

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	刘瑞峰1
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	朱哲明1
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	李盟1
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	刘邦1
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关键词 ：岩石力学, I型裂纹, 爆炸载荷, 起裂韧度, 扩展韧度, 止裂韧度

Abstract：In order to study the parameters of fracture toughness and the propagation behavior of mode I crack under blasting loads，crack propagation gauges(CPGs) and single internal crack circular disc(SICCD) specimens were first applied in the tests of fracture toughness. The specimens of PMMA and the testing system of oscilloscope and ultra-dynamic strain amplifier were employed. Numerical models were established with the dynamic finite difference code AUTODYN and finite element code ABAQUS. The crack propagation velocity，dynamic initiation toughness，propagation toughness and fracture parameters of mode I crack were obtained through the experimental and numerical methods. The experimental results show that in the process of crack propagation，there is a cusp point on the propagation path and the phenomenon of crack arrest occurs at the cusp point. When the crack restarts to crack again，the speed will increase. CPGs monitor more accurately the propagation behavior of crack. The fracture toughness and other dynamic parameters were obtained with the experimental-numerical methods. The preliminary analysis shows that the dynamic crack arrest toughness is greater than the dynamic initiation toughness and the dynamic propagation toughness under blasting loads.

Key words： rock mechanics mode-I crack blasting initiation toughness propagation toughness arrest toughness

引用本文:

刘瑞峰1，2，朱哲明1，2，李盟1，2，刘邦1，2. 爆炸载荷下I型裂纹的起裂及扩展规律研究[J]. 岩石力学与工程学报, 2018, 37(2): 392-402.
LIU Ruifeng1，2，ZHU Zheming1，2，LI Meng1，2，LIU Bang1，2. Initiation and propagation of mode I crack under blasting. , 2018, 37(2): 392-402.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1126 或 http://www.rockmech.org/CN/Y2018/V37/I2/392

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