岩石I/II复合断裂韧度测试的单边切槽深梁试件：数值分析与标定

doi:10.13722/j.cnki.jrme.2015.1450

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摘要提出一种用于岩石材料I/II复合断裂韧度测试的新试件——单边切槽深梁(SENDB)试件，使用有限元法对新试件I(II)型无量纲应力强度因子YI(YII)及无量纲T应力T*进行系统研究和数值标定。研究结果证实SENDB试件可方便地通过调整裂纹倾角、裂缝长度a和支座间距2S实现从纯I型到纯II型任意I/II复合度荷载作用下的岩石断裂韧度测试。与现有弯曲类试件对比分析表明：(1) SENDB试件与经典的单边切槽梁(SENB)试件在几何尺寸和岩石复合断裂韧度测试方法上存在显著差异，SENDB试件是通过调整裂缝倾角实现复合加载，而SENB则是通过移动裂缝位置(无法实现纯II型加载)或四点弯曲试验(加载装置复杂)实现复合加载；(2) 因可方便地加工系列尺寸(包括大尺寸)的试件，新构形相比圆盘类试件在尺寸效应研究方面略有优势；(3) 与国外学者新近提出的ECT试件相比，SENDB试件可选择的量纲一的裂缝长度和量纲一的支座间距范围要更宽泛；(4) 为了实现从纯I型到纯II型整个区间的复合断裂测试，对SENDB，SCB和ECT三种试件，均应使用较小的支座间距或较长的裂缝。

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	罗毅1
	2
	任利1
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	谢凌志1
	2
	李存宝1
	2
	王俊1
	2
	高超2

关键词 ：岩石力学, 断裂韧度, 单边切槽深梁试样, 三点弯曲试验, 复合断裂

Abstract：A new specimen，namely the single edge notched deep beam(SENDB) specimen，which could test the mixed-mode fracture toughness of rock materials was proposed. The finite element method(FEM) was used to analyze and calibrate the mode I and mode II dimensionless stress intensity factors(i.e. YI and YII) and the dimensionless T-stress(i.e. T*) of the new specimen. Numerical results demonstrated that the SENDB specimen indeed could test the mixed-mode fracture toughness of rocks in a full range of mode mixities from pure mode I to pure mode II by different combinations of the crack inclined angle ，the crack length a and the half distance S between the two bottom supports. The dimensions of the new specimen significantly differed with the ones of the classic single edged notched beam(SENB) specimen，and the mixed-mode loadings can be introduced by an inclined crack in a SENDB specimen while for a SENB specimen mixed-mode loadings are introduced with asymmetry three points bend test(which can not introduce pure mode II loading) or four points bend test(which requires a complex loading fixture). In the aspect of the investigation on scale effect，the SENDB specimen is more suitable than the disc-type specimens，especially for very large size. Compared to the edge crack triangular(ECT) specimen recently proposed by other researchers，the SENDB specimen can conduct mixed-mode fracture tests within a large range of dimensionless crack length and dimensionless span distance. To successfully conduct a pure mode II fracture test，a relative small span distance and a relative long crack are recommended for SENDB，SCB and ECT specimens.

Key words： rock mechanics fracture toughness single edge notched deep beam specimen three-points bend test mixed-mode fracture

引用本文:

罗毅1，2，任利1，2，谢凌志1，2，李存宝1，2，王俊1，2，高超2. 岩石I/II复合断裂韧度测试的单边切槽深梁试件：数值分析与标定[J]. 岩石力学与工程学报, 2016, 35(S2): 3633-3643.
LUO Yi1，2，REN Li1，2，XIE Lingzhi1，2，LI Cunbao1，2，WANG Jun1，2，GAO Chao2. Single edge notched deep beam specimen to test I/II mixed-mode fracture toughness of rocks： numerical analysis and calibration. , 2016, 35(S2): 3633-3643.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1450 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3633

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