Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics

2015 ◽  
Vol 99 (3) ◽  
pp. 979-987 ◽  
Author(s):  
Aaron Lichtner ◽  
Denis Roussel ◽  
David Jauffrès ◽  
Christophe L. Martin ◽  
Rajendra K. Bordia
Keyword(s):  
Mechanical Response ◽  
Porous Ceramics ◽  
Hierarchically Porous

Thermal and Mechanical Response of Industrial Porous Ceramics

2010 ◽  
Vol 652 ◽  
pp. 191-196 ◽  
Author(s):  
Giovanni Bruno ◽  
Alexander M. Efremov ◽  
Andrey N. Levandovskiy ◽  
Irina Pozdnyakova ◽  
Darren J. Hughes ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Thermal Cycling ◽  
Mechanical Behavior ◽  
Porous Materials ◽  
Applied Load ◽  
Mechanical Response ◽  
Porous Ceramics ◽  
Deformation Mechanisms ◽  
Mechanical Loads

In this study, the mechanical behavior of porous thermally microcracked ceramics has been compared with that of solely porous materials, under compressive applied stress. The different aspects of the micro and macroscopic stress-strain curves have been inserted into a coherent analytical model and compared with finite element modeling calculations. The agreement between experiments and models is very good. It is shown that mechanical microcracking, as opposed to thermal, introduces an irreversible aspect in the deformation mechanisms of porous ceramics. In this concern, mechanical loads differentiate themselves from thermal cycling. This leads for instance to a change of the Young’s modulus as a function of applied load, which qualifies those materials as visco-elastic.

scholarly journals Strength of hierarchically porous ceramics: Discrete simulations on X-ray nanotomography images

2016 ◽  
Vol 113 ◽  
pp. 250-253 ◽  
Author(s):  
Denis Roussel ◽  
Aaron Lichtner ◽  
David Jauffrès ◽  
Julie Villanova ◽  
Rajendra K. Bordia ◽  
...  
Keyword(s):  
Porous Ceramics ◽  
Hierarchically Porous ◽  
X Ray

Hierarchically Porous Ceramics via Direct Writing of Binary Colloidal Gel Foams

2021 ◽  
Vol 13 (7) ◽  
pp. 8976-8984
Author(s):  
Benito Román-Manso ◽  
Joseph Muth ◽  
Lorna J. Gibson ◽  
Wolfgang Ruettinger ◽  
Jennifer A. Lewis
Keyword(s):  
Porous Ceramics ◽  
Direct Writing ◽  
Hierarchically Porous ◽  
Colloidal Gel

Hierarchically Porous Ceramics from Diatomite Powders by Pulsed Current Processing

2009 ◽  
Vol 92 (2) ◽  
pp. 338-343 ◽  
Author(s):  
Farid Akhtar ◽  
Petr O. Vasiliev ◽  
Lennart Bergström
Keyword(s):  
Porous Ceramics ◽  
Pulsed Current ◽  
Hierarchically Porous

Microstructure and mechanical and thermal shock properties of hierarchically porous ceramics

2021 ◽  
Author(s):  
Bo Li ◽  
Yongda Yan ◽  
Xinxin Jin ◽  
Yanquan Geng ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Porous Ceramics ◽  
Hierarchically Porous

Comparison of Substructures Between Uniaxial and Biaxial Deformation in 1100-0 Aluminum

1981 ◽  
Vol 39 ◽  
pp. 52-53
Author(s):  
D. L. Rohr ◽  
S. S. Hecker
Keyword(s):  
Plastic Strain ◽  
Cell Walls ◽  
Room Temperature ◽  
Mechanical Response ◽  
Biaxial Tension ◽  
Initial Deformation ◽  
Uniaxial Deformation ◽  
Biaxial Deformation ◽  
Stress States ◽  
Comprehensive Study

As part of a comprehensive study of microstructural and mechanical response of metals to uniaxial and biaxial deformations, the development of substructure in 1100 A1 has been studied over a range of plastic strain for two stress states.Specimens of 1100 aluminum annealed at 350 C were tested in uniaxial (UT) and balanced biaxial tension (BBT) at room temperature to different strain levels. The biaxial specimens were produced by the in-plane punch stretching technique. Areas of known strain levels were prepared for TEM by lapping followed by jet electropolishing. All specimens were examined in a JEOL 200B run at 150 and 200 kV within 24 to 36 hours after testing.The development of the substructure with deformation is shown in Fig. 1 for both stress states. Initial deformation produces dislocation tangles, which form cell walls by 10% uniaxial deformation, and start to recover to form subgrains by 25%. The results of several hundred measurements of cell/subgrain sizes by a linear intercept technique are presented in Table I.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

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