{"title":"剪切破坏试验中黏聚区应力、耗散和断裂能分析","authors":"Nicolas Brantut","doi":"10.1029/2024GL113972","DOIUrl":null,"url":null,"abstract":"<p>We analyze high resolution slip rate data obtained during dynamic shear rupture experiments by Berman et al. (2020), https://doi.org/10.1103/physrevlett.125.125503. We use an inverse method to extract the details of strength evolution within the cohesive zone. The overall behavior is slip-weakening at high rupture speeds (<span></span><math>\n <semantics>\n <mrow>\n <mo>></mo>\n <mn>0.76</mn>\n <msub>\n <mi>C</mi>\n <mi>R</mi>\n </msub>\n </mrow>\n <annotation> ${ >} 0.76{C}_{\\mathrm{R}}$</annotation>\n </semantics></math>, where <span></span><math>\n <semantics>\n <mrow>\n <msub>\n <mi>C</mi>\n <mi>R</mi>\n </msub>\n </mrow>\n <annotation> ${C}_{\\mathrm{R}}$</annotation>\n </semantics></math> is the Rayleigh wavespeed), but non-monotonic at low rupture speeds <span></span><math>\n <semantics>\n <mrow>\n <mfenced>\n <mrow>\n <mo><</mo>\n <mn>0.76</mn>\n <msub>\n <mi>C</mi>\n <mi>R</mi>\n </msub>\n </mrow>\n </mfenced>\n </mrow>\n <annotation> $\\left(< 0.76{C}_{\\mathrm{R}}\\right)$</annotation>\n </semantics></math>, with a transient increase after an initial strong weakening. The slower ruptures are associated to more weakening in the cohesive zone. The fraction of breakdown work associated to the initial weakening, immediately behind the rupture tip, matches the fracture energy estimated by independent methods, but the total breakdown work can be much larger than fracture energy. Complex stress evolution in the cohesive zone is compatible with a well-defined fracture energy that explains rupture tip propagation, but the complexity is reflected in local slip rates that will impact radiated waves.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 9","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113972","citationCount":"0","resultStr":"{\"title\":\"Analysis of Stress in the Cohesive Zone, Dissipation and Fracture Energy During Shear Rupture Experiments\",\"authors\":\"Nicolas Brantut\",\"doi\":\"10.1029/2024GL113972\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>We analyze high resolution slip rate data obtained during dynamic shear rupture experiments by Berman et al. (2020), https://doi.org/10.1103/physrevlett.125.125503. We use an inverse method to extract the details of strength evolution within the cohesive zone. The overall behavior is slip-weakening at high rupture speeds (<span></span><math>\\n <semantics>\\n <mrow>\\n <mo>></mo>\\n <mn>0.76</mn>\\n <msub>\\n <mi>C</mi>\\n <mi>R</mi>\\n </msub>\\n </mrow>\\n <annotation> ${ >} 0.76{C}_{\\\\mathrm{R}}$</annotation>\\n </semantics></math>, where <span></span><math>\\n <semantics>\\n <mrow>\\n <msub>\\n <mi>C</mi>\\n <mi>R</mi>\\n </msub>\\n </mrow>\\n <annotation> ${C}_{\\\\mathrm{R}}$</annotation>\\n </semantics></math> is the Rayleigh wavespeed), but non-monotonic at low rupture speeds <span></span><math>\\n <semantics>\\n <mrow>\\n <mfenced>\\n <mrow>\\n <mo><</mo>\\n <mn>0.76</mn>\\n <msub>\\n <mi>C</mi>\\n <mi>R</mi>\\n </msub>\\n </mrow>\\n </mfenced>\\n </mrow>\\n <annotation> $\\\\left(< 0.76{C}_{\\\\mathrm{R}}\\\\right)$</annotation>\\n </semantics></math>, with a transient increase after an initial strong weakening. The slower ruptures are associated to more weakening in the cohesive zone. The fraction of breakdown work associated to the initial weakening, immediately behind the rupture tip, matches the fracture energy estimated by independent methods, but the total breakdown work can be much larger than fracture energy. Complex stress evolution in the cohesive zone is compatible with a well-defined fracture energy that explains rupture tip propagation, but the complexity is reflected in local slip rates that will impact radiated waves.</p>\",\"PeriodicalId\":12523,\"journal\":{\"name\":\"Geophysical Research Letters\",\"volume\":\"52 9\",\"pages\":\"\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-04-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113972\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geophysical Research Letters\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1029/2024GL113972\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geophysical Research Letters","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024GL113972","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
我们分析了Berman等人（2020），https://doi.org/10.1103/physrevlett.125.125503在动态剪切破裂实验中获得的高分辨率滑移率数据。我们使用逆方法来提取黏聚区内强度演化的细节。在高断裂速度下(>；0.76 C R ${>} 0.76{C}_{\mathrm{R}}$，其中C R ${C}_{\mathrm{R}}$为瑞利波速度)，但在低断裂速度下非单调；0.76 C R $\left(<；0.76{C}_{\ mathm {R}}\right)$，初始强减弱后瞬态增加。较慢的破裂与黏结带的更弱有关。与破裂尖端后面的初始削弱相关的击穿功的比例与独立方法估计的断裂能相匹配，但总击穿功可能远大于断裂能。黏结区内复杂的应力演化与定义明确的断裂能相一致，这解释了破裂尖端的传播，但复杂性反映在将影响辐射波的局部滑移率上。
Analysis of Stress in the Cohesive Zone, Dissipation and Fracture Energy During Shear Rupture Experiments
We analyze high resolution slip rate data obtained during dynamic shear rupture experiments by Berman et al. (2020), https://doi.org/10.1103/physrevlett.125.125503. We use an inverse method to extract the details of strength evolution within the cohesive zone. The overall behavior is slip-weakening at high rupture speeds (, where is the Rayleigh wavespeed), but non-monotonic at low rupture speeds , with a transient increase after an initial strong weakening. The slower ruptures are associated to more weakening in the cohesive zone. The fraction of breakdown work associated to the initial weakening, immediately behind the rupture tip, matches the fracture energy estimated by independent methods, but the total breakdown work can be much larger than fracture energy. Complex stress evolution in the cohesive zone is compatible with a well-defined fracture energy that explains rupture tip propagation, but the complexity is reflected in local slip rates that will impact radiated waves.
期刊介绍：
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
