A mode II cohesive crack in an infinite medium subjected to remote heat flux - Effect of thermal resistance of the cohesive zone

Wang J.; Jin Z-H; Gao C-F

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A mode II cohesive crack in an infinite medium subjected to remote heat flux - Effect of thermal resistance of the cohesive zone

机译：在远程热通量的无限介质中的模式II粘性裂缝 - 粘性区热阻的影响

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摘要

The present work aims to investigate the effect of interfacial thermal resistance of a cohesive zone on thermal fracture behavior of materials. We consider the development of a cohesive zone at the tip of a mode II crack in an infinite plate subjected to remote heat flux thermal loading. Thermal resistance is assumed to exist along the cohesive zone. The heat conduction and thermal crack/ cohesive zone problem becomes a fully coupled, nonlinear one due to the interaction between the cohesive zone length and temperature field. The temperature distribution along the crack/cohesive zone, the cohesive zone length, and the crack tip sliding displacement are obtained. The numerical results show that the cohesive zone length increases with an increase in the interfacial thermal resistance of the cohesive zone. The crack tip sliding displacement is also significantly influenced by the thermal resistance of the cohesive zone.

机译：本作者旨在探讨粘性区域对材料热断裂行为的界面热阻的影响。我们考虑在经过远程热通量热负荷的无限板上的模式II裂缝尖端处的粘性区域的发展。假设热阻沿着粘性区域存在。由于粘性区长度和温度场之间的相互作用，导热和热裂纹/粘性区问题变为完全耦合的非线性，因此。获得沿裂缝/粘性区，粘性区长度和裂纹尖端滑动位移的温度分布。数值结果表明，粘性区长度随着粘性区域的界面热阻的增加而增加。裂纹尖端滑动位移也受到粘性区域的热阻的显着影响。

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来源
《Engineering Fracture Mechanics》 |2018年第2018期|共10页
作者
Wang J.; Jin Z-H; Gao C-F;
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作者单位

Nanjing Univ Aeronaut &

Astronaut Coll Aerosp Engn Nanjing 210016 Jiangsu Peoples R China;

Univ Maine Dept Mech Engn Orono ME 04469 USA;

Nanjing Univ Aeronaut &

Astronaut Coll Aerosp Engn Nanjing 210016 Jiangsu Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类工程力学;
关键词
Interfacial thermal resistance; Crack; Cohesive zone; Thermal stress; Crack sliding displacement;

机译：界面热阻;裂缝;凝聚区;热应力;裂纹滑动位移;

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专利

1. A mode II cohesive crack in an infinite medium subjected to remote heat flux - Effect of thermal resistance of the cohesive zone [J] . Wang J., Jin Z-H, Gao C-F Engineering Fracture Mechanics . 2018,第期

机译：在远程热通量的无限介质中的模式II粘性裂缝 - 粘性区热阻的影响
2. Multiscale cohesive zone model for propagation of segmented crack fronts in mode I plus III fracture [J] . Leblond Jean-Baptiste, Lazarus Veronique, Karma Alain International Journal of Fracture . 2015,第1a2期

机译：I型和III型断裂中分段裂纹前沿扩展的多尺度粘结带模型
3. Simulation of mixed-mode I/III stable tearing crack growth events using the cohesive zone model approach [J] . Xin Chen, Xiaomin Deng, Michael A. Sutton International Journal of Fracture . 2014,第1期

机译：使用内聚区模型方法模拟混合模式I / III稳定撕裂裂纹扩展事件
4. Effects of the Cohesive Law in Ductile Crack Analysis using Cohesive Zone Models [C] . X.Li, H.Yuan European Conference on Fracture . 2012

机译：内聚规律在采用粘性区模型的塑性裂纹分析中的作用
5. Numerical modeling of homogeneous and bimaterial crack tip and interfacial cohesive zones with various traction-displacement laws. [D] . Mokashi, Prasad Shrikant. 2007

机译：具有不同牵引位移规律的均质和双材料裂纹尖端和界面内聚区的数值模拟。
6. Numerical Simulation of Crack Propagation in Flexible Asphalt Pavements Based on Cohesive Zone Model Developed from Asphalt Mixtures [O] . Pengfei Liu, Jian Chen, Guoyang Lu, 2019

机译：基于沥青混合料粘结区域模型的柔性沥青路面裂缝扩展数值模拟
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

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A mode II cohesive crack in an infinite medium subjected to remote heat flux - Effect of thermal resistance of the cohesive zone

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