热冲击下脆性材料的完整相场断裂模型
A complete phase-field fracture model for brittle materials subjected to thermal shocks
AI总结：
提出一个完整的相场断裂模型，用于热力耦合问题，独立指定材料属性、强度和断裂韧性，通过玻璃淬火、陶瓷红外辐射和快速功率脉冲等实验验证，模型能统一处理不同断裂场景，优于经典方法。
摘要：
受到热冲击的脆性材料会经历强烈的温度梯度，进而产生足以引起断裂的机械应力。本文提出了一个用于热力耦合问题的完整相场断裂模型，其中块体材料属性、材料强度和断裂韧性可独立指定。该模型的能力在热力断裂的广泛场景中进行了评估，从大型预存裂纹的扩展到空间均匀应力状态下的裂纹成核。特别地，我们重新审视了玻璃板的受控淬火，并展示了模型如何捕捉在不同热载荷下实验观察到的裂纹模式。还研究了受红外辐射的陶瓷盘，模型再现了带缺口试样中的直裂纹和完整试样中的分叉裂纹。最后，研究了受快速功率脉冲作用的陶瓷颗粒，模型解释了从完整到断裂颗粒的实验转变以及材料强度的重要作用。结果表明，完整的相场模型统一了热冲击下不同断裂场景的处理，超越了经典方法，能够更可靠地预测极端环境中的脆性断裂。
英文摘要：
Brittle materials subjected to thermal shocks experience strong temperature gradients that in turn give rise to mechanical stresses that can be large enough to induce fracture. This work presents a complete model for phase-field fracture for coupled thermo-mechanical problems, wherein the bulk material properties, the material strength, and the fracture toughness are specified independently. The capabilities of the model are assessed across a wide span of scenarios in thermo-mechanical fracture, from the propagation of large pre-existing cracks to crack nucleation under spatially uniform states of stress. In particular, we revisit the controlled quenching of glass plates, and demonstrate how the model captures experimentally observed crack patterns across a range of thermal loads. Ceramic disks subjected to infrared radiation are also examined, with the model reproducing both straight cracks in notched specimens and branching in intact specimens. Finally, ceramic pellets subjected to rapid power pulses are examined, with the model explaining experimental transitions from intact to fractured pellets and the important role of material strength. The results demonstrate that the complete phase-field model unifies the treatment of distinct fracture scenarios under thermal shock, surpassing classical approaches and enabling more reliable prediction of brittle fracture in extreme environments.
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