Meso-fracture mechanism of Longmaxi shale with different crack-depth ratios: Experimental and numerical investigations

材料科学 断裂韧性 复合材料 断裂力学 剪切(地质) 断裂(地质) 极限抗拉强度 油页岩 裂缝闭合 成核 裂纹扩展阻力曲线 地质学 各向异性 量子力学 物理 古生物学 有机化学 化学
作者
Lei Bo,Hongtao Li,Jianping Zuo,Haiyan Liu,Meilu Yu,Genshui Wu
出处
期刊:Engineering Fracture Mechanics [Elsevier BV]
卷期号:257: 108025-108025 被引量:12
标识
DOI:10.1016/j.engfracmech.2021.108025
摘要

The mechanical properties and fracture mechanism of shale are vital to the design of hydraulic fracturing schemes. To better understand the formation and evolution of hierarchical crack networks in shales, a scanning electron microscope (SEM) with a loading device was applied to carry out three-point bending experiment on Longmaxi shale with different crack-depth ratios (CDR). The micro-damage and fracture processes of shale were observed in situ. Based on the double-K fracture criterion, the subcritical crack length, and the initial and unstable fracture toughness were calculated theoretically. The results demonstrated that the crack initial load, peak load, and subcritical crack length decreased significantly with the increase of the CDR. Both the initial and unstable fracture toughness were relatively stable when the CDR was between 0.3 and 0.5, and they can be regarded as constants. The meso-failure mechanism of shale was tensile and shear failure, and fracture patterns were inter-granular, trans-granular and coupled fracture. Generally, tensile failure typically results in irregular rough sections, whereas shear failure results in smooth sections with parallel slip lines. The micropores inside and between the crystals can induce the connection and penetration of cracks. The initiation of microcracks is the result of the continuous accumulation and nucleation of multiple micro/nanoscale damage, and the tortuous crack path is caused by the variation in the local stress field at the crack tip. In addition, clump and smooth joint model (SJM) were introduced to simulate the effect of the sedimentary particle and bedding plane on crack propagation based on particle flow code in two dimensions (PFC2D). The simulation results were in good agreement with the experimental observations.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
罗拉发布了新的文献求助10
刚刚
1秒前
1秒前
鱼e完成签到,获得积分10
3秒前
3秒前
4秒前
4秒前
song发布了新的文献求助10
6秒前
ding应助时尚初之采纳,获得10
6秒前
罗拉完成签到,获得积分10
6秒前
6秒前
7秒前
yun尘世完成签到,获得积分10
8秒前
8秒前
自信南霜完成签到,获得积分10
8秒前
tingting9完成签到,获得积分10
11秒前
11秒前
12秒前
卡布奇诺完成签到,获得积分10
12秒前
13223456发布了新的文献求助10
12秒前
青山落日秋月春风完成签到,获得积分10
14秒前
15秒前
16秒前
16秒前
小马甲应助动听的雅绿采纳,获得30
17秒前
1177发布了新的文献求助10
19秒前
19秒前
喜喵喵完成签到,获得积分10
20秒前
20秒前
20秒前
20秒前
11关注了科研通微信公众号
21秒前
123456完成签到,获得积分10
22秒前
时尚初之发布了新的文献求助10
22秒前
ddd完成签到,获得积分10
23秒前
喜喵喵发布了新的文献求助10
25秒前
无情的函发布了新的文献求助10
25秒前
麦乐迪完成签到 ,获得积分10
26秒前
SYLH应助云横秦岭家何在采纳,获得10
26秒前
bkagyin应助如意枫叶采纳,获得10
27秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3989242
求助须知:如何正确求助?哪些是违规求助? 3531393
关于积分的说明 11253753
捐赠科研通 3270010
什么是DOI,文献DOI怎么找? 1804868
邀请新用户注册赠送积分活动 882084
科研通“疑难数据库(出版商)”最低求助积分说明 809136