基于圆弧底试件的动态裂纹扩展及止裂规律研究

郎林; 朱哲明; 邓帅; 牛草原; 万端莹; 王磊

doi:10.11883/bzycj-2019-0448

基于圆弧底试件的动态裂纹扩展及止裂规律研究

doi: 10.11883/bzycj-2019-0448

郎林^{1, 2,},
朱哲明^{1, 2, ,},
邓帅^{1, 2},
牛草原^{1, 2},
万端莹^{1, 2},
王磊^{1, 2}

1.
四川大学深地科学与工程教育部重点实验室，四川成都 610065
2.
四川大学建筑与环境学院，四川成都 610065

基金项目: 国家自然科学基金(11672194，U19A2098)；四川省科技计划(2018JZ0036)

详细信息

作者简介:
郎　林（1984－　），男，博士研究生，高级工程师，langlinww@163.com

通讯作者:
朱哲明（1965－　），男，博士，教授，zhemingzhu@hotmail.com

中图分类号: O346.1; TU45
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- 文章访问数: 3196
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- 被引次数: 0
出版历程
- 收稿日期: 2019-11-23
- 修回日期: 2020-02-24
- 刊出日期: 2020-09-01

Dynamic crack growth and crack arrest law based on arc bottom specimen

LANG Lin^{1, 2
,},
ZHU Zheming^{1, 2
, ,},
DENG Shuai^{1, 2},
NIU Caoyuan^{1, 2},
WAN Duanying^{1, 2},
WANG Lei^{1, 2}

1.
MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China
2.
College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China

摘要

摘要: 为了研究脆性材料的动态裂纹扩展及止裂规律，设计了一种带圆弧形底边的梯形开口边裂纹（trapezoidal opening crack with arc bottom，TOCAB）构型的试件。在落锤冲击设备加载下，对圆心角为0°、60°、90°和120°的TOCAB试件进行了冲击实验，并采用裂纹扩展计(crack propagation gauge，CPG)监测裂纹起裂和扩展时间，从而获得裂纹扩展速度。采用有限差分软件AUTODYN对落锤冲击设备和试件进行数值模拟，研究了裂纹的动态扩展过程及止裂规律。还基于实验和数值方法，计算了裂纹的临界动态应力强度因子。实验和数值结果均表明：3种弧度的TOCAB试件都可以实现运动裂纹止裂，该构型可用于研究动态裂纹止裂问题；数值计算的裂纹扩展路径与实验结果基本一致，验证了数值模型的有效性；裂纹起裂和止裂时刻的临界动态应力强度因子大于裂纹动态扩展过程中的临界动态应力强度因子。
- 冲击加载 /
- 动态裂纹扩展 /
- 裂纹止裂 /
- 圆弧底 /
- 临界动态应力强度因子
Abstract: In order to study the crack growth and crack arrest law of the brittle materials, a large-sized trapezoidal opening crack with arc bottom (TOCAB) configuration specimen was proposed. The impact tests were carried out on the TOCAB specimens with radians of 0°, 60°, 90° and 120° under the drop hammer impact device. The crack growth speed was obtained by using the distance between the two resistance wires divided by the break time of the resistance wire of the crack propagation gauge, and crack propagation gauge (CPG) was used to monitor the crack initiation time and expansion time. The crack growth behavior of the TOCAB specimen was numerically simulated by using the finite difference software AUTODYN. And the crack growth process and the crack arrest law were numerically studied. The critical dynamic stress intensity factor of the moving crack was calculated based on the experimental-numerical method and the finite element software ABAQUS. Both experimental and numerical results show that the three arc-bottom specimens have a crack-stopping effect on the moving crack, andthe TOCAB configuration specimen is suitable for studying the crack arrest problem. And the crack growth path obtained in the numerical calculation is basically consistent with the experimental results, which verifies the validity of the numerical model. And the critical dynamic stress intensity factor at the time of crack initiation and crack arrest is greater than that at the time of the crack growth.
- impact loading /
- dynamic crack growth /
- crack arrest /
- arc bottom /
- critical dynamic stress intensity factor

HTML全文

图 1 试件几何尺寸和裂纹止裂机理

Figure 1. Dimension of sample and crack arrest principle

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图 2 4种用于研究动态断裂行为的大尺寸试件的构型

Figure 2. Four samples were used to measure dynamic fracture toughness

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图 3 落锤装置和数据采集系统

Figure 3. Drop hammer device and data acquisition system

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图 4 由入射杆和透射杆测量的的荷载曲线

Figure 4. Loading curves measured from incident barand transmission bar

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图 5 电压信号及其对时间的导数

Figure 5. Voltage signal history and its derivative with respect to time

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图 6 圆弧底试件的反射压缩波

Figure 6. Reflected compression wave of arc bottom specimen

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图 7 裂纹尖端位置和裂纹扩展速度

Figure 7. Crack tip locations and crack growth velocities

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图 8 落锤冲击装置和试件的网格划分

Figure 8. Grid division diagram of drop hammer impact device and specimen

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图 9 裂纹扩展路径的实验结果和数值模拟结果

Figure 9. Experimental results and numerical simulation results of crack growth paths

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图 10 试件最大水平压应力沿裂纹路径的变化

Figure 10. Maximum horizontal compressive stressesalong crack paths of specimens

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图 11 裂纹长度随加载率的变化

Figure 11. Crack lengths varying with loading rates

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图 12 有限元模型网格划分

Figure 12. Finite element model meshing

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图 13 在裂纹起始和扩展过程中临界DSIF的计算方法

Figure 13. Calculation method of critical DSIF during crack initiation and propagation

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图 14 临界动态应力强度因子、裂纹速度与瑞利波波速之比与裂纹长度的关系

Figure 14. Critical dynamic stress intensity factors, ratios of crack velocity to Rayleigh wave velocity varying with crack lengths

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