Fracture toughness of porous materials – Experimental methods and data

Jelitto, Hans; Schneider, Gerold A.

doi:10.1016/j.dib.2019.103709

Cited by 23 publications

(9 citation statements)

References 16 publications

(131 reference statements)

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“…The K Ic of alumina samples AP0‐No1 to AP25‐No7, with the same PMMA particle types, sintering temperature, and layer thickness (i.e., PMMA‐1/1650°C/50 μm) follows a decreasing trend with increasing PMMA‐content and corresponding porosity. These experimental results are in good agreement with the fracture toughness of porous ceramics fabricated with conventional methods, as reported in literature, where the fracture toughness of alumina may decrease by approximately 40% and 55% for 20% and 28% porosity, respectively 63,64 …”

Section: Resultssupporting

confidence: 90%

“…These experimental results are in good agreement with the fracture toughness of porous ceramics fabricated with conventional methods, as reported in literature, where the fracture toughness of alumina may decrease by approximately 40% and 55% for 20% and 28% porosity, respectively. 63,64 The fracture toughness of alumina sample AP10-No2 was K Ic = 1.96 ± 0.13 MPa m 1/2 , which is approximately 30% lower than that of pure alumina. In the case of 3D-printed alumina fabricated with higher PMMA content, such as 20% and 25%, K Ic decreased to 1.44 ± 0.02 and 1.37 ± 0.10 MPa m 1/2 , respectively.…”

Section: Fracture Toughnessmentioning

confidence: 91%

See 1 more Smart Citation

3D‐printed alumina‐based ceramics with spatially resolved porosity

Nohut,

Schlacher,

Kraleva

et al. 2023

Int J Applied Ceramic Tech

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The interest on porous ceramics has increased in the last years with the developments in additive manufacturing methods, enabling design of components with complex geometries for membranes, filters, catalytic converters, or biostructures. In this study, porous alumina samples were produced by using different concentrations of poly(methyl methacrylate) as pore‐forming agent in a photocurable slurry via vat photopolymerization. The effect of layer thickness, poly(methyl methacrylate) particle size and sintering temperature on the mechanical properties and microstructural features of the samples was investigated as a function of poly (methyl methacrylate) concentration.. It is shown that the mechanical properties of 3D‐printed porous alumina are comparable with those fabricated by conventional processes. The Young's modulus, fracture toughness as well as the biaxial strength decreased with increasing weight concentration of pore forming agent (resulting in an increased total porosity). Specially using smaller poly(methyl methacrylate) particles has a positive effect, resulting in higher Young's modulus as well as fracture toughness. The feasibility of vat photopolymerization for fabricating novel parts with more complex porosity regions is explored by printing multi‐material samples and porosity graded architectures. The counterbalance effect between porosity and mechanical properties may be optimized by tailoring material composition and processing parameters.This article is protected by copyright. All rights reserved

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Section: Resultssupporting

confidence: 90%

Section: Fracture Toughnessmentioning

confidence: 91%

3D‐printed alumina‐based ceramics with spatially resolved porosity

Nohut,

Schlacher,

Kraleva

et al. 2023

Int J Applied Ceramic Tech

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“…Substituting σ fS between Equations 11 and 12, we obtain

\frac{K_{IC}}{\frac{K_{ICs}}{\sqrt{π a}} \sqrt{π l}} = C {(\frac{ρ_{f}}{ρ_{s}})}^{1 + n} yielding to : \frac{K_{IC}}{ρ_{f}} = \frac{K_{ICs}}{ρ_{s}} \sqrt{\frac{l}{a}} C {(\frac{ρ_{f}}{ρ_{s}})}^{n} .

More recently, Jelitto and Schneider 36,37 proposed some interesting geometric micromechanical models relating the fracture toughness K IC of foams to the fracture mechanics of solid material K ICs , considering three models: closed cell foams …”

Section: Micromechanical Models For Fracture Toughness Of Foams Predimentioning

confidence: 99%

Fracture toughness of rigid polymeric foams: A review

Marșavina

Linul

2020

Fatigue Fract Eng Mat Struct

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Polymeric foams have good capacity of absorbing energy in compression but are brittle in tension. Linear elastic fracture mechanics is successfully applied to assess the integrity of polymeric foam-based composite structures. The fracture toughness represents an important parameter. The different approaches to estimate the fracture toughness of polymeric foams are reviewed: analytical and numerical micromechanical models and experimental investigations. Focus is given on the parameters influencing the fracture toughness of polymeric foams like specimen type, solid material, density, loading speed, size effect and temperature. Data on mixed-mode loading and dynamic fracture toughness are also presented. The last part of the paper presents some results to increase the fracture toughness by reinforcing of polymeric foams.

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“…However, often the methodology proposed in [7] was adopted for determination of fracture toughness of polymeric foams, considering Single Edge Notched Specimens loaded in Three-Point Bending [8][9][10], respectively Compact Tension specimens [11]. Jelitto and Schneider [12] revised the experimental methods and the fracture toughness data of porous materials including PUR foams, respectively Marsavina and Linul [13] presented a review of the fracture of polymeric foams.…”

Section: Introductionmentioning

confidence: 99%

Is Fracture Toughness of PUR Foams a Material Property? A Statistical Approach

et al. 2020

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The published data on the experimentally determined fracture toughness of foams are based on a small number of specimens, having a lack of statistical consistency. The paper proposes a statistical approach on the fracture toughness results of rigid polyurethane (PUR) foams of three different densities. Five types of fracture tests were considered. The results were statistically analyzed using six types of regressions and a meta-analysis to identify the factors influencing the fracture toughness. The statistical analysis indicates that the fracture toughness represents a material property because does not depend on the specimen type. The density plays a major role in the fracture toughness of PUR foams. The irregular shape of the cells induced small anisotropy for low-density foams (100 kg/m3 and 145 kg/m3). This effect could not be observed for the foam with 300 kg/m3 density, for which the cells have a more regular spherical shape. The statistical analysis indicates that the influence of the loading speed is very weak.

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Fracture toughness of porous materials – Experimental methods and data

Cited by 23 publications

References 16 publications

3D‐printed alumina‐based ceramics with spatially resolved porosity

3D‐printed alumina‐based ceramics with spatially resolved porosity

Fracture toughness of rigid polymeric foams: A review

Is Fracture Toughness of PUR Foams a Material Property? A Statistical Approach

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