FEM predictions of damage in continous fiber ceramic matrix composites under transverse tension using the crack band method

Meyer, Pascal; Waas, Anthony M.

doi:10.1016/j.actamat.2015.09.002

Cited by 52 publications

(17 citation statements)

References 18 publications

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“…These composites can sustain a great deal of damage in the form of matrix cracks and fiber fractures, while still maintaining load‐carrying ability. Better understanding of damage accumulation such as the number and location of matrix cracks and fiber breaks within the volume of the specimen is needed to increase confidence in life prediction and to provide experimental observations to contrast with mechanical models …”

Section: Introductionmentioning

confidence: 99%

“…Better understanding of damage accumulation such as the number and location of matrix cracks and fiber breaks within the volume of the specimen is needed to increase confidence in life prediction and to provide experimental observations to contrast with mechanical models. [5][6][7][8][9][10][11][12] Typically, damage accumulation in CMCs is directly observed using surface microscopy techniques either in situ or postfracture. [13][14][15][16] For example, damage mechanisms such as crack opening displacement and matrix crack density have been studied using DIC and manual crack opening displacement measurements by Sevener et al 17 They used these measurements to study the in-situ progression of matrix cracking in woven SiC/SiC CMCs under tensile load using an SEM and DIC techniques.…”

Section: Introductionmentioning

confidence: 99%

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Damage evolution in SiC/SiC unidirectional composites by X‐ray tomography

2020

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Melt infiltrated SiC/SiC ceramic matrix composite unidirectional (UD) composite specimens were imaged under load using X‐ray microtomography techniques in order to visualize the evolution of damage accumulation and to quantify damage mechanisms within the composite such as matrix cracking and fiber breaking. The data obtained from these in situ tensile tests were used in comparison with current models and literature results. Three‐dimensional (3D) tomography images were used to measure the location and spacing of matrix cracking that occurred at increasing stress increments during testing within two UD composite specimens. The number of broken fibers and the location of each fiber break gap that occurred within the volume of both specimens were also quantified. The 3D locations of fiber breaks were correlated with the location of each matrix crack within the volume of the specimen and it was found that at the stress scanned directly before failure, most of the fiber breaks occur within 100 microns of a matrix crack.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damage evolution in SiC/SiC unidirectional composites by X‐ray tomography

2020

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“…e coating layer is essentially a compliant interphase. It can arrest cracks, deflect crack propagation paths, and prevent cracks occurring in the fiber and matrix phases from joining together [2]. As a result, the complicated fracture process significantly improves the damage tolerance of the CMC materials although each constituent is still brittle [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…eir RVE models had random fiber distributions, but they were not connected with any experimental measurements. Meyer and Waas [2] performed micromechanical analysis of CMC materials subjected to transverse tension. ey considered fracture behavior of the matrix and coating materials using the crack band method.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nonuniform Fiber Geometries on the Microstructural Fracture Behavior of Ceramic Matrix Composites

Kim

Cho

et al. 2019

Mathematical Problems in Engineering

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Microstructural fracture behavior of a ceramic matrix composite (CMC) with nonuniformly distributed fibers is studied in the presentation. A comprehensive numerical analysis package to study the effect of nonuniform fiber dimensions and locations on the microstructural fracture behavior is developed. The package starts with an optimization algorithm for generating representative volume element (RVE) models that are statistically equivalent to experimental measurements. Experimentally measured statistical data are used as constraints while the optimization algorithm is running. Virtual springs are utilized between any adjacent fibers to nonuniformly distribute the coated fibers in the RVE model. The virtual spring with the optimization algorithm can efficiently generate multiple RVEs that are statistically identical to each other. Smeared crack approach (SCA) is implemented to consider the fracture behavior of the CMC material in a mesh-objective manner. The RVEs are subjected to tension as well as the shear loading conditions. SCA is capable of predicting different fracture patterns, uniquely defined by not only the fiber arrangement but also the specific loading type. In addition, global stress-strain curves show that the microstructural fracture behavior of the RVEs is highly dependent on the fiber distributions.

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“…研究等方面取得了丰硕成果, 但到目前为止, 仍然难以实现精确的力学性能仿真和力学行为预判, CFRCMCs 组分、微观结构和宏观力学性能间本构关系尚未精确构建, 这主要是因为 CFRCMCs 中各组分原位微观力学参量的缺失。CFRCMCs 中各组分的原位微观力学参量(主要包括纤维与基体的模量、韧性, 界面结合强度等)既决定了 CFRCMCs 的宏观力学性能, 又是宏观力学数值仿真的关键输入参量 [6][7][8] 。长久以来, CFRCMCs 中各组分微观力学参量的测量一直是难点问题, 这一方面由于陶瓷材料固有的脆性使小尺度微观力学测试样品制备困难, 另一方面由于微观力学参数测试手段与理论的不完善 [9] , 导致 CFRCMCs 微观力学研究工作进展相对缓慢。近年来, 随着以纳米压痕为代表的纳米力学测量技术和以聚焦离子束(FIB)为代表的微纳加工技术的快速发展, CFRCMCs 原位微观力学研究工作取得显著进步, 并在 CFRCMCs 宏观力学性能研究工作中发挥了重要作用 [10][11][12][13][14][15][16][17][18][19][20][21][22][23] 中纤维与基体的原位模量 [24][25][26][27] , 测量过程简单易操作, 可以真实地反映 CFRCMCs 中纤维与基体的原位力学参量信息, 相对于传统通过纤维与基体宏观力学测试方法获取的力学参量更加准确。测量过程如下: 对 CFRCMCs 进行抛光处理, 在纳米压痕成像系统辅助下, 分别定位纤维与基体区域, 采用 Berkovich 压头进行加载, 根据 Oliver-Pharr 定律计算测量样品的弹性模量 [24] : [10] , 采用纳米压痕测量的…”

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Research Progress on Micro-mechanical Property of Continuous Fiber-reinforced Ceramic Matrix Composites

Liu¹,

Yang²,

Han³

2018

Journal of Inorganic Materials

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Localized mechanical properties of composite components (fiber, matrix, and interface) are critical parameters bridging the composition, microstructure and macro-mechanical performance of continuous fiber-reinforced ceramic matrix composites (CFRCMCs). However, they are difficult to be acquired and decoupled from bulk composites based on the traditional macro-mechanical testing techniques, due to their limited testing volumes and complex heterogeneous composite structures. The above questions has been solved recently by novel nano/micro mechanical testing and focused ion beam milling (FIB) techniques, which provide powerful tools to quantify the micro-mechanical properties of CFRCMCs. In this paper, recent progress in micro-mechanical properties of CFRCMCs was firstly reviewed, with special emphasis on the in-situ modulus and toughness of ceramic fibers and matrix, and the shear property of fiber/matrix interface. Following that, a criterion based on the He-Hutchinson cracking model was proposed to predict the macro mechanical performance of CFRCMCs by using those micro-mechanical parameters.

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FEM predictions of damage in continous fiber ceramic matrix composites under transverse tension using the crack band method

Cited by 52 publications

References 18 publications

Damage evolution in SiC/SiC unidirectional composites by X‐ray tomography

Damage evolution in SiC/SiC unidirectional composites by X‐ray tomography

Effects of Nonuniform Fiber Geometries on the Microstructural Fracture Behavior of Ceramic Matrix Composites

Research Progress on Micro-mechanical Property of Continuous Fiber-reinforced Ceramic Matrix Composites

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