Cohesive zone modeling of grain boundary microcracking induced by thermal anisotropy in titanium diboride ceramics

Pezzotta, M.; Zhang, Z.L.; Jensen, Morten Sundheim; Grande, Tor; Einarsrud, Mari‐Ann

doi:10.1016/j.commatsci.2007.12.011

Cited by 22 publications

(10 citation statements)

References 27 publications

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“…To simulate the CPF-induced stress in the FEM, the CPF was assigned to have a nonzero thermal expansion coefficient, whereas a zero value was assigned to the copper substrate. A similar method has been employed to introduce the residual stresses induced by elastic anisotropy 36 37 38 and the welding process 39 40 , in which the thermal expansion coefficients had no specific physical meaning. From the assumed CPF property, when Δ T > 0 (in which Δ T corresponds to the temperature change in the simulation process), the CPF expands to simulate the compressive stress in the CPF.…”

Section: Methodsmentioning

confidence: 99%

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

Wang

Zhang

Ren

et al. 2015

Sci Rep

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Finite element analyses were conducted to clarify the role of corrosion product films (CPFs) in stress corrosion cracking (SCC). Flat and U-shaped edge-notched specimens were investigated in terms of the CPF-induced stress in the metallic substrate and the stress in the CPF. For a U-shaped edge-notched specimen, the stress field in front of the notch tip is affected by the Young’s modulus of the CPF and the CPF thickness and notch geometry. The CPF-induced tensile stress in the metallic substrate is superimposed on the applied load to increase the crack tip strain and facilitate localized plasticity deformation. In addition, the stress in the CPF surface contributes to the rupture of the CPFs. The results provide physical insights into the role of CPFs in SCC.

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Section: Methodsmentioning

confidence: 99%

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

Wang

Zhang

Ren

et al. 2015

Sci Rep

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“…Cohesive elements have been used previously for modeling ceramic fracture and are defined by a traction–separation law. The equivalence of the Barenblatt fracture criterion, which is the basis of the cohesive zone element, with the Griffith fracture criterion has been previously shown by Willis .…”

Section: Finite Element Modelingmentioning

confidence: 99%

“…This type of thermally induced microcracking has been observed in a variety of ceramics and is often an advantageous and tailored material feature . Consequently, the formation and propagation of microcracks has been studied as a function of many parameters including grain size and orientation, and elastic and thermal anisotropy . Other studies have attempted to examine the effect of microcracking on the macroscopic properties and behavior of the microcracked ceramic .…”

Section: Introductionmentioning

confidence: 99%

Towards Prediction of Thermally Induced Microcrack Initiation and Closure in Porous Ceramics

Fertig

Nickerson

2015

J. Am. Ceram. Soc.

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This article describes development of a model to predict microcrack density evolution as a function of thermal history in porous ceramics with anisotropic thermal expansion coefficients. The model is based on the evolution of statistical distributions of grain-boundary stresses and crack opening displacements (CODs), and represents universal cracking and crack closure behavior scaled by coefficients that depend on the microstructure and material properties. The functional forms for this model were developed from a 2D finite element simulation of thermally induced microcracking. Specifically, the grain-boundary stresses and CODs were studied, and a parameter describing each quantity was calibrated from modulus hysteresis data. An additional calibration parameter was also introduced to link crack density to macroscopic behavior. The model was applied to experimental results from a porous cordierite ceramic and shown to accurately describe its behavior. K. Faber-contributing editor Manuscript No. 36058. J ournalto microcrack growth and the bilinear transition point was manually selected with net results shown in Fig. 2.

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“…At some critical level of thermal expansion mismatch and particle size, cracking can occur. This phenomenon has been investigated by a number of researchers . Pan et al .…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of ZrB₂–SiC Composites with Varying SiC Particle Sizes

Watts

Hilmas

2011

J. Am. Ceram. Soc.

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Flexural strength, elastic modulus, and hardness were used to characterize the mechanical properties of ZrB 2 -SiC composites that contained varying SiC particle sizes. Dense ZrB 2 -SiC composites consisting of 70 vol% ZrB 2 and 30 vol% a-SiC were produced via hot pressing. This series of composites had maximum SiC particle sizes that ranged from 4.4 to 18 lm. The mechanical properties scaled with the maximum SiC particle size, not with ZrB 2 grain size. Flexural strength decreased as the maximum size of SiC particles increased from 1150 MPa at 4.4 lm to 245 MPa at 18 lm with an abrupt decrease in strength at~11.5 lm. Elastic modulus remained constant at~530 GPa for compositions containing SiC particles smaller than 11.5 lm, but exhibited a decrease with larger SiC particle sizes. Vickers and Knoop hardness were 21.4 and 17.2 GPa, respectively, for ceramics with SiC particle sizes <11.5 lm, but hardness decreased for larger SiC particle sizes. The decreases in strength, elastic modulus, and hardness with SiC particles larger than 11.5 lm were coincident with stressinduced microcracking in the composites. R. Cutler-contributing editor

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Cohesive zone modeling of grain boundary microcracking induced by thermal anisotropy in titanium diboride ceramics

Cited by 22 publications

References 27 publications

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

Towards Prediction of Thermally Induced Microcrack Initiation and Closure in Porous Ceramics

Mechanical Characterization of ZrB₂–SiC Composites with Varying SiC Particle Sizes

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Cohesive zone modeling of grain boundary microcracking induced by thermal anisotropy in titanium diboride ceramics

Cited by 22 publications

References 27 publications

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

Towards Prediction of Thermally Induced Microcrack Initiation and Closure in Porous Ceramics

Mechanical Characterization of ZrB2–SiC Composites with Varying SiC Particle Sizes

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Mechanical Characterization of ZrB₂–SiC Composites with Varying SiC Particle Sizes