Ⅰ型裂纹中低速冲击荷载下起裂韧度测试新方法

施泽彬; 朱哲明; 汪小梦; 王雄

doi:10.11883/bzycj-2017-0132

Ⅰ型裂纹中低速冲击荷载下起裂韧度测试新方法

doi: 10.11883/bzycj-2017-0132

四川大学建筑与环境学院能源工程安全与灾害力学教育部重点实验室, 四川成都 610065

基金项目:

国家自然科学基金项目 11672194

国家自然科学基金项目 11702181

四川省安全监管局安全生产科技项目 aj20170515161307

详细信息

作者简介:
施泽彬(1992-), 男, 硕士研究生

通讯作者:
朱哲明, zhemingzhu@hotmail.com

中图分类号: O346;TU45
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- 被引次数: 0
出版历程
- 收稿日期: 2017-04-26
- 修回日期: 2017-09-16
- 刊出日期: 2018-11-25

A new testing method for mode Ⅰ crack initiation fracture toughness under middle-low speed impacts

Key Laboratory of Energy Engineering Safety and Disaster Mechanics, School of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China

摘要

摘要: 为了探寻更加合理的构型试件来研究纯Ⅰ型裂纹在冲击荷载下的起裂及扩展行为, 提出一种新构型试件, 即双倾斜底边中心裂纹试件(double inclined bottom central cracked, DIBCC)。借助于中低速落锤式冲击实验装置进行冲击实验, 通过应力波来使试件内预制裂纹起裂并扩展, 同时利用应变片测试系统监测裂纹起裂时刻, 并采用AUTODYN有限差分软件对实验过程进行数值模拟, 最后计算裂纹的动态应力强度因子, 利用实验测得的起裂时刻, 确定试件的起裂韧度。结果表明:(1)在反射拉伸波作用下, 预制裂纹两侧会产生垂直于裂纹面向外的位移, 使预制裂纹扩张, 从而使裂纹起裂。(2)数值模拟结果与实验结果在裂纹扩展路径上具有一致性, 说明本文中提出的DIBCC构型试件有效, 可以用来测试裂纹在冲击载荷下的断裂韧度。
- 纯Ⅰ型裂纹 /
- 双倾斜底边中心裂纹(DIBCC) /
- 应力波 /
- 冲击荷载 /
- AUTODYN /
- 起裂韧度
Abstract: In this work, we proposed a specimen with a new configuration specimen, i.e.double inclined bottom central cracked specimen (DIBCC) to explore a more suitable configuration specimen for the study of the behavior of Mode Ⅰ crack under impacts, by conducting tests using a middle-low speed drop hammer impact test device, and by driving the initiation and propagation of the prefabricated crack inside the DIBCC specimens using stress waves.Meanwhile, we measured the crack initiation time using a strain gauge test system and carried out the corresponding numerical simulation using the AUTODYN finite difference code.Then we calculated the dynamic stress intensity factors and determined the initiation toughness of the specimens using the initiation time measured from the experiments.The results show that, under the action of the reflected tensile waves, the prefabricated crack surfaces have outward displacements perpendicular to the crack surface, making the prefabricated crack expand and thus induce the crack to initiate, and that the numerical result of the crack propagation path agrees well with the test result, indicating that the DIBCC configuration specimen proposed is effective and can be used to test the fracture toughness under impacts.
- mode Ⅰ crack /
- double inclined bottom central cracked specimen(DIBCC) /
- stress wave /
- impact load /
- AUTONYN /
- initiation fracture toughness

HTML全文

图 1 DIBCC构型实验方法示意图

Figure 1. Test method of DIBCC specimen

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图 2 DIBCC构型模型示意图

Figure 2. Sketch of DIBCC specimen

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图 3 中低速冲击加载装置

Figure 3. Middle-low impact loading device

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图 4 数据采集系统

Figure 4. Data collection system

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图 5 入射端与透射端应变时程曲线

Figure 5. Curves of strain versus time recorded from incident and transmitted plates

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图 6 裂纹尖端应变片的电压信号时程曲线

Figure 6. Curves of voltage signal versus time recorded from strain gauges stuck at the crack tip

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图 7 3个时刻y方向应力云图

Figure 7. Nephograms of stress in y-direction at three moments

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图 8 裂纹尖端应力时程曲线及其右侧点的位移曲线

Figure 8. Curves of stress in x-direction versus time at gauge 19 and displacement in x-direction versus time at gauge 5

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图 9 数值模拟结果及实验得到的试件破坏结果

Figure 9. Test results of specimen fracture patterns and numerical simulation result

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图 10 裂纹张开位移示意图

Figure 10. Deformation of crack opening displacement

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图 11 裂纹面三个点的水平位移时程曲线

Figure 11. Displacement of three points on crack surface as a function of time

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图 12 动态应力强度因子时程曲线

Figure 12. Curve of dynamic stress intensity factor versus time

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