STRESS INTENSITY RELAXATION AT THE TIP OF AN EDGE CRACK IN A FUNCTIONALLY GRADED MATERIAL SUBJECTED TO A THERMAL SHOCK
STRESS INTENSITY RELAXATION AT THE TIP OF AN EDGE CRACK IN A FUNCTIONALLY GRADED MATERIAL SUBJECTED TO A THERMAL SHOCK
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DOI：
10.1080/01495739608946178
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发表时间：
1996-06
影响因子：
2.8
通讯作者：
Zhongmin Jin;R. Batra
中科院分区：
文献类型：
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作者：
Zhongmin Jin;R. Batra
本文分析了在裂纹表面突然冷却的功能梯度材料（FGM）边裂纹板条中的热应力和应力强度因子。假设材料的剪切模量随着暴露于热冲击的表面处的较高值呈双曲线减小，并且热导率呈指数变化。陶瓷-金属功能梯度材料中组分的体积分数，然后确定与假设的剪切模量梯度使用的三相模型的常规复合材料。其他假设的材料性能和预测的三相模型之间的差异划定和假设的FGM的适用性进行了讨论。它示出的最大拉伸热应力在没有裂纹的带大幅减少由假设的热导率梯度和压应力的大小增加。在远离热震面处形成一个强压缩带。
We analyze thermal stresses and the stress intensity factor in an edge-cracked strip of a functionally graded material (FGM) subjected to sudden cooling at the cracked surface. It is assumed that the shear modulus of the material decreases hyperbolically with the higher value at the surface exposed to the thermal shock and that the thermal conductivity varies exponentially. Volume fractions of the constituents in a ceramic-metal FGM are then determined with the assumed shear modulus gradient using a three-phase model of conventional composites. The differences between the other assumed material properties and those predicted by the three-phase model are delineated and the applicability of the assumed FGM is discussed. It is shown that the maximum tensile thermal stress in the strip without cracks is substantially reduced by the assumed thermal conductivity gradient and that the magnitude of the compressive stress is increased. A strong compressive zone just away from the thermally shocked surface is devel...