| 张财贵,周妍,杨井瑞,王启智.用边裂纹平台圆环试样测试岩石的Ⅰ型动态断裂韧度[J].水利学报,2014,45(6): |
| 用边裂纹平台圆环试样测试岩石的Ⅰ型动态断裂韧度 |
| Determination of model-I dynamic fracture toughness of rock using edge cracked flattened ring （ECFR） specimen |
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| DOI： |
| 中文关键词: 边裂纹平台圆环 动态起裂韧度 动态扩展韧度 普适函数 裂纹扩展计 实验-数值法 |
| 英文关键词: edge cracked flattened ring （ECFR） dynamic initiation toughness dynamic propagation toughness universal function crack propagation gauge experiment-numerical method |
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| 中文摘要: |
| 用大直径（? 100 mm）分离式霍普金森压杆径向冲击边裂纹平台圆环试样，测试砂岩的Ⅰ型动态断裂韧度。使用裂纹扩展计（crack propagation gauge，CPG）测定试样起裂时刻和裂纹扩展速度，结果表明裂纹扩展计测定比传统电阻应变片更为灵敏，测定结果更接近裂纹破坏真实情况。用实验-数值法确定了试样的动态起裂韧度，采用实验-数值法并结合普适函数进一步求得砂岩的动态扩展韧度。研究发现在一定范围内动态起裂韧度随加载率的增加而增大，而动态扩展韧度随裂纹扩展速度的变大而略微增加。 |
| 英文摘要: |
| The edge cracked flattened ring （ECFR） specimens of sandstone were diametrically impacted by large-diameter split Hopkinson pressure bar （SHPB） in the model-I rock dynamic fracture test. Crack propagation gauge （CPG） is used to measure the crack initiation time and crack propagation velocity， the CPG is more sensitive than traditional strain gauge， and measured results are closer to reality. The experiment-numerical method is used to determine the dynamic initiation toughness， while the universal function combined with experiment-numerical method is adopted to determine the dynamic propagation toughness.The rock dynamic fracture test indicates that， in a certain range， the dynamic initiation toughness and dynamic propagation toughness increase with increasing dynamic loading rate and crack propagation velocity，respectively. |
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