Thermal shock resistance of functionally graded materials
Thermal shock resistance of functionally graded materials
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DOI：
10.1016/j.actamat.2004.06.008
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发表时间：
2004-10-04
期刊：
影响因子：
9.4
通讯作者：
Zhang, XH
中科院分区：
文献类型：
--
作者：
Wang, BL;Mai, YW;Zhang, XH
采用有限元/有限差分法求解功能梯度材料的瞬态温度场和热应力。考虑了温度相关的材料特性。给出了板、壳、球等常见单元的一维瞬态热传导的显式表达式。这些表达式对于材料工程师和科学家确定高温应用中功能梯度材料的热应力和强度分布是有用的。分析了功能梯度材料板突然暴露于不同温度的环境介质中时的热冲击断裂。使用基于应力和基于韧性的失效准则研究了材料可以承受的容许温度跳跃。确定了控制介质中瞬态热应力水平的关键参数。采用最大局部拉应力和最大应力强度因子准则分析了功能梯度材料的抗热震性能。(C)2004 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Transient temperature field and associated thermal stresses in functionally graded materials (FGMs) are determined by a finite element/finite difference (FE/FD) method. Temperature-dependent material properties are taken into consideration. Explicit expressions for one-dimensional transient thermal conduction in some common elements, such as plate, shell and sphere, are given. These expressions are useful for material engineers and scientists to determine the thermal stresses and strength distributions in FGMs for high temperature applications. Thermal shock fracture of a FGM plate is analyzed when the plate is suddenly exposed to an environmental medium of a different temperature. The admissible temperature jump that the materials can sustain is studied using stress-based and fracture-toughness-based failure criteria. The critical parameters governing the level of the transient thermal stress in the medium are identified. The thermal shock resistance of the FGMs is analyzed using both maximum local tensile stress and maximum stress intensity factor criteria. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.