| 用数字散斑相关方法研究竹材在拉伸载荷下的断裂行为 |
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| 引用本文： | 云礼宁,马少鹏,李霞镇,任海青. 用数字散斑相关方法研究竹材在拉伸载荷下的断裂行为[J]. 北京理工大学学报, 2011, 31(3): 258-261 |
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| 作者姓名： | 云礼宁 马少鹏 李霞镇 任海青 |
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| 作者单位： | 北京理工大学宇航学院;中国林业科学研究院木材工业研究所; |
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| 基金项目： | 国家“十一五”科技支撑计划项目(2008BADA9B03); 国家自然科学基金资助项目(10972038) |
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| 摘 要： | 用数字散斑相关方法(DSCM)实验研究了无预制裂纹的毛竹试件在拉伸载荷下的断裂行为.基于试件表面的图像以及DSCM测量的位移场和应变场,分析和总结了竹材的断裂失效模式和破坏机理,定量测量了竹材的断裂韧性.研究发现竹材试件在拉伸时先在竹黄部分出现横向裂纹,此裂纹进而向竹肉横向稳定扩展,加载继续进行时裂纹会突然转为纵向并发生失稳扩展,使试件沿纤维方向破坏.通过DSCM测量得到的位移场获得了裂纹的临界张开位移,计算得到实验用竹材的断裂韧性KⅠc=4.2MPa.m0.5.
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| 关 键 词： | 竹材 断裂韧性 数字散斑相关方法 裂纹张开位移 |
| 收稿时间： | 2009-12-14 |
Experimental Study of the Fracture Behavior of Bamboo Under Tension Based on Digital Speckle Correlation Method |
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| YUN Li-ning,MA Shao-peng,LI Xia-zhen and REN Hai-qing. Experimental Study of the Fracture Behavior of Bamboo Under Tension Based on Digital Speckle Correlation Method[J]. Journal of Beijing Institute of Technology(Natural Science Edition), 2011, 31(3): 258-261 |
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| Authors: | YUN Li-ning MA Shao-peng LI Xia-zhen REN Hai-qing |
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| Affiliation: | YUN Li-ning1,MA Shao-peng1,LI Xia-zhen2,REN Hai-qing2(1.School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China,2.Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China) |
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| Abstract: | The fracture behavior of moso bamboo under tensile load was experimentally studied using digital speckle correlation method(DSCM).Based on the captured images and the DSCM measured displacement and strain fields,the classic fracture mode and mechanism of the bamboo was analyzed and summarized,and the fracture toughness of bamboo was quantitatively measured.The experimental results show that,when the specimen is loading,a transverse crack firstly appeares in the Shiraia bambusicola and then expands to the ba... |
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| Keywords: | moso bamboo fracture toughness digital speckle correlation methed(DSCM) crack opening displacement(COD) |
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