A functionally graded particulate composite: Preparation, measurements and failure analysis
A functionally graded particulate composite: Preparation, measurements and failure analysis
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DOI：
10.1016/s1359-6454(98)00305-x
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发表时间：
1998-12-10
期刊：
影响因子：
9.4
通讯作者：
Tippur, HV
中科院分区：
文献类型：
--
作者：
Butcher, RJ;Rousseau, CE;Tippur, HV
制备了一种功能梯度复合材料，并测量了功能梯度材料(FGM)中杨氏模量的空间梯度。弹性模数梯度发生在适合使用光学干涉法进行实验力学研究的长度尺度上。在准静态加载条件下，裂纹尖端场被映射到功能梯度材料中，裂纹方向垂直于弹性梯度方向，靠近三点弯曲试件的梯度部分和均匀部分的界面。基于对功能梯度材料中裂纹尖端行为的普遍理解，光学测量被用来提取断裂参数。计算结果还与有限元计算结果进行了比较，其中包含了功能梯度材料的实测弹性性质。通过裂纹萌生试验，证明了采用功能梯度材料夹层节点相对于分段均匀节点的优越性。(C)1998年，爱思唯尔科学出版社出版的Acta Metallurica Inc.版权所有。
A functionally graded composite is prepared and the spatial gradation of Young's modulus in the functionally graded material (FGM) is measured. Elastic modulus gradients occur over length scales suitable for experimental mechanics investigations using optical interferometry. Crack tip fields are mapped in the FGM under quasi-static loading conditions with cracks oriented perpendicular to the direction of the elastic gradient and near the interface of the graded and the homogeneous portions of three-point-bending specimens. The optical measurements are used to extract fracture parameters based on the prevailing understanding of the crack tip behavior in FGMs. The results are also compared with finite element computations which incorporate measured elastic properties of the FGM. The advantage of using FGM interlayer as opposed to piecewise homogeneous joints is demonstrated through crack initiation tests. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Lid. All rights reserved.