Direct Observation of Failure in Ice-Templated Ceramics Under Dynamic and Quasistatic Compressive Loading Conditions

Akurati, Sashanka; Ghosh, Dipankar; Banda, Mahesh; Terrones, Diego A.

doi:10.1007/s40870-019-00212-z

Cited by 9 publications

(9 citation statements)

References 34 publications

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“…For ice-templated ceramic materials, it has been shown that strength decreases as morphology changes from dendritic to lamellar. 9,[13][14][15]20,44,45,47 Therefore, the current results revealed that the role of high C s and FFV was to preserve highly dendritic morphology throughout the ice-templated microstructure in the growth direction of ice crystals, which was beneficial to achieve markedly high compressive strength.…”

Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 63%

“…Increase in wall thickness and decrease in bridge density with a decrease in FFV, as well as along the growth direction are characteristics of ice-templated materials. 9,10,[13][14][15] Ice-templated microstructure development was relatively poor in this series.…”

Section: 31mentioning

confidence: 67%

“…This trend was consistent with the previous studies that also reported that compressive strength increased with FFV due to the decrease in pore size and increase in bridge density. 9,[13][14][15]20,[44][45][46][47] In any series, in LFFV regime, strength increased with C s . In every series, strength increased significantly up to C CT 0.03 g/cm 3 ; however, with a further increase in C CT , strength remained about the same or only marginally increased.…”

Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 82%

“…11 Electrode failure due to these stresses will result in reduced accessible battery energy, power density and round trip efficiency, and decreased battery lifetime. 12 Ice-templated microstructure and mechanical properties can be tuned by changing freezing front velocity (FFV, growth velocity of ice crystals), [13][14][15] additive type and concentration, 9,16 and particle size and shape. 14,15 Magnetic field, 17 ultrasound, 18 direct current electric field, 19 and alternating current electric field 20 have also been used to manipulate ice-templated microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

et al. 2022

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This work investigated the role of sucrose and cationic dispersant (1‐hexadecyl)trimethylammonium bromide concentration on ice‐templated sintered lithium titanate microstructure and compressive strength, to enable a comprehensive understanding of composition selection and elucidate processing–microstructure–mechanical property relationships. Sucrose and dispersant concentrations were varied to change total solute concentration in suspensions and viscosity. Dispersant was more effective in reducing viscosity than sucrose; however, their combination had an even greater impact on reducing viscosity. Based on viscosity measurements, a total of 12 suspension compositions were developed, and materials were fabricated at two different freezing front velocity (FFV) regimes. Solute concentration greatly influenced ice‐templated microstructure and microstructure development improved with solute concentration. Depending on solute concentration, type of solute, viscosity, and FFV, a wide variety of microstructures were observed ranging from lamellar to dendritic morphologies. Solute concentration effect was rationalized based on solid–liquid planar interface instability. For suspensions with comparable viscosity, solute concentration can be varied to tune microstructure, whereas for suspensions with comparable solute concentration, viscosity variation can tune microstructure. Compressive strength of sintered materials generally increased with total solute concentration, sucrose concentration, viscosity, and FFV. Due to the wide variety of microstructure, strength also varied over a wide range, 23–128 MPa.

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Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 63%

Section: 31mentioning

confidence: 67%

Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

et al. 2022

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“…38 For the verification of the stress equilibrium, an analysis was done to calculate the transit time of the leading edge of the incident wave to propagate through the material. 39 For a quasi-isotropic laminate, the longitudinal wave speed, C s , is estimated aswhere EQI=57.8normal normalGPanormal is the modulus of quasi-isotropic laminate and ρs=1598normal kg/normalm3 is the density of the composite.…”

Section: Inspection Of Afp Defect Morphology and Shpb Testing Of Afp Compositementioning

confidence: 99%

Effects of automated fiber placement defects on high strain rate compressive response in advanced thermosetting composites

Trochez

Jamora

Larson

et al. 2021

Journal of Composite Materials

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The effects of fiber tow gaps, overlaps, and folds on the compressive strength of a fiber-placed composite laminate under dynamic loading conditions are investigated in this work. These layup defects were placed in the 0° fiber direction within a 24-ply quasi-isotropic laminate with a [45/0/–45/90]3S stacking sequence. Different locations of the defect were considered, namely near the bottom (in the 2nd ply), middle (10th ply) and top (23rd ply) of the laminate. High-strain rate compression experiments were conducted on composite that are pristine and with embedded defects using a split Hopkinson pressure bar (SHPB). The results were used to determine the strength knockdown due to the local changes in ply morphology because of fiber bed compaction in the presence of a layup defect. The experimental results revealed the anisotropy of in-plane strength coinciding with the deposited defect orientation. No significant variations in the residual strength were observed regarding the location of the defect (i.e., bottom, middle, or top) within the laminate. A morphological analysis based on microtomography of the cured defects indicates that the sources of the strength knockdown are due to the 0° ply drop-off, fiber misalignment in the adjacent 90° and 45° degree plies and the resin-rich region formed at the corner of the tapered 0° ply, between +45° and –45° laminas. The present study indicates the increased role of local morphological ply variations on the strength of composites under high-strain rate loading conditions, which should be considered during composite design.

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Role of Microstructure on Impact Response and Damage Morphology of Ice-Templated Porous Ceramics

Akurati

Terrones

Ghosh

2020

J. dynamic behavior mater.

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The central focus of this study is to investigate the influence of microstructure and direction of impact (relative to the growth direction of ice crystals) on the impact behavior of ice-templated sintered alumina materials and understand the relationship between dynamic compressive strength and impact response. All materials were fabricated using alumina suspensions of the same solid loading but at three different freezing front velocity (FFV) regimes; very-high FFV, moderately-high FFV, and low FFV. Lamella wall thickness, pore size, and pore aspect ratio decreased, and wall connectivity increased with FFV. Materials also exhibited a structural gradient along the growth direction of ice crystals. As the templated microstructure became finer with FFV, the impact resistance of the materials increased, and radius of damage crater, depth-of-penetration, and mass loss decreased. Materials also exhibited radial cracking, and the materials fabricated at very-high FFV showed a greater propensity for radial cracking for impact along the growth direction. The impact process evolved in three phases; penetration phase, dwell phase and rebound phase. Analysis of high-speed videos revealed that modifying the microstructure affected not only the impact resistance but also the duration of these phases. Variation in microstructure caused a change in the mechanism of damage evolution during impact. Dynamic compressive strength increased with FFV, and the results revealed a direct relationship between impact response and strength. For both impact and dynamic compression, energy absorption per unit volume increased with FFV, further reinforcing the relationship between impact behavior and the dynamic compressive response of ice-templated materials.

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Direct Observation of Failure in Ice-Templated Ceramics Under Dynamic and Quasistatic Compressive Loading Conditions

Cited by 9 publications

References 34 publications

Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

Effects of automated fiber placement defects on high strain rate compressive response in advanced thermosetting composites

Role of Microstructure on Impact Response and Damage Morphology of Ice-Templated Porous Ceramics

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