Influence of the measurement method and sample dimensions on the Young's modulus of open porous alumina foam structures

2019 ◽  
Vol 45 (5) ◽  
pp. 5987-5995 ◽  
Author(s):  
Joern Grabenhorst ◽  
Bruno Luchini ◽  
Jens Fruhstorfer ◽  
Claudia Voigt ◽  
Jana Hubálková ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Measurement Method ◽  
Young's Modulus ◽  
Porous Alumina ◽  
Alumina Foam

scholarly journals High-Temperature Elastic Properties of Yttrium-Doped Barium Zirconate

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 968
Author(s):  
Fumitada Iguchi ◽  
Keisuke Hinata
Keyword(s):  
High Temperature ◽  
Young’S Modulus ◽  
Elastic Properties ◽  
Measurement Method ◽  
Young's Modulus ◽  
Barium Zirconate ◽  
Shear Moduli ◽  
Ceramic Fuel ◽  
Yttrium Concentration ◽  
Ceramic Fuel Cells

The elastic properties of 0, 10, 15, and 20 mol% yttrium-doped barium zirconate (BZY0, BZY10, BZY15, and BZY20) at the operating temperatures of protonic ceramic fuel cells were evaluated. The proposed measurement method for low sinterability materials could accurately determine the sonic velocities of small-pellet-type samples, and the elastic properties were determined based on these velocities. The Young’s modulus of BZY10, BZY15, and BZY20 was 224, 218, and 209 GPa at 20 °C, respectively, and the values decreased as the yttrium concentration increased. At high temperatures (>20 °C), as the temperature increased, the Young’s and shear moduli decreased, whereas the bulk modulus and Poisson’s ratio increased. The Young’s and shear moduli varied nonlinearly with the temperature: The values decreased rapidly from 100 to 300 °C and gradually at temperatures beyond 400 °C. The Young’s modulus of BZY10, BZY15, and BZY20 was 137, 159, and 122 GPa at 500 °C, respectively, 30–40% smaller than the values at 20 °C. The influence of the temperature was larger than that of the change in the yttrium concentration.

Strength and Young's Modulus Behavior of a Partially Sintered Porous Alumina

1995 ◽  
Vol 78 (1) ◽  
pp. 266-268 ◽  
Author(s):  
Savitha C. Nanjangud ◽  
Rasto Brezny ◽  
David J. Green
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Porous Alumina

scholarly journals Porous Functional Graded Bioceramics with Integrated Interface Textures

Ceramics ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 681-695
Author(s):  
Jonas Biggemann ◽  
David Köllner ◽  
Swantje Simon ◽  
Paula Heik ◽  
Patrizia Hoffmann ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Porous Alumina ◽  
Biological Response ◽  
Discontinuous Transition ◽  
Linear Waves ◽  
Free Interfaces ◽  
Mechanical Strengths ◽  
Immense Potential ◽  
Porous Bioceramics

Porous functional graded ceramics (porous FGCs) offer immense potential to overcome the low mechanical strengths of homogeneously porous bioceramics used as bone grafts. The tailored manipulation of the graded pore structure including the interfaces in these materials is of particular interest to locally control the microstructural and mechanical properties, as well as the biological response of the potential implant. In this work, porous FGCs with integrated interface textures were fabricated by a novel two-step transfer micro-molding technique using alumina and hydroxyapatite feedstocks with varied amounts of spherical pore formers (0–40 Vol%) to generate well-defined porosities. Defect-free interfaces could be realized for various porosity pairings, leading to porous FGCs with continuous and discontinuous transition of porosity. The microstructure of three different periodic interface patterns (planar, 2D-linear waves and 3D-Gaussian hills) was investigated by SEM and µCT and showed a shape accurate replication of the CAD-designed model in the ceramic sample. The Young’s modulus and flexural strength of bi-layered bending bars with 0 and 30 Vol% of pore formers were determined and compared to homogeneous porous alumina and hydroxyapaite containing 0–40 Vol% of pore formers. A significant reduction of the Young’s modulus was observed for the porous FGCs, attributed to damping effects at the interface. Flexural 4-point-testing revealed that the failure did not occur at the interface, but rather in the porous 30 Vol% layer, proving that the interface does not represent a source of weakness in the microstructure.

scholarly journals Effects ofStreptococcus sanguinisBacteriocin on Deformation, Adhesion Ability, and Young’s Modulus ofCandida albicans

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Shengli Ma ◽  
Wenyu Ge ◽  
Yifan Yan ◽  
Xu Huang ◽  
Li Ma ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Young’S Modulus ◽  
Measurement Method ◽  
Young's Modulus ◽  
Streptococcus Sanguinis ◽  
Adhesion Ability ◽  
Atomic Force ◽  
Ofcandida Albicans ◽  
Reaction Region ◽  
Microscopic Morphology

In order to study the thallus changes on microscopic morphology and mechanical properties ofCandida albicansantagonized byStreptococcus sanguinisbacteriocin, the adhesion ability and Young’s modulus of thalli and hypha ofCandida albicanswere measured by the relative measurement method using atomic force microscope’s (AFM) tapping model. The results showed that the average adhesion ability and Young’s modulus of thalli were7.35±0.77 nN and7.33±1.29 Mpa, respectively; the average adhesion ability and Young’s modulus of hypha were9.82±0.39 nN and4.04±0.76 Mpa, respectively. After being antagonized byStreptococcus sanguinisbacteriocin, the adhesion ability was decreased along with the increasing of deformation in reaction region and Young’s modulus followed the same changes. It could be concluded that the adhesion ability of hypha was greater than thalli, Young’s modulus of hypha was less than thalli, and adhesion ability and Young’s modulus ofCandida albicanswere decreased significantly after being antagonized byStreptococcus sanguinisbacteriocin.

scholarly journals Pengukuran Modulus Young dengan Analisis Keadaan Resonansi Batang Aluminium yang Bergetar Menggunakan ImageMeter

2017 ◽  
Vol 2 ◽  
pp. 346
Author(s):  
Maria Tefa ◽  
Ign Edi Santosa
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Young’S Modulus ◽  
Natural Frequency ◽  
Measurement Method ◽  
Young's Modulus ◽  
Resonance Condition ◽  
Alternating Current ◽  
Resonance Frequencies ◽  
The Magnetic Field

<p class="AbstractEnglish"><strong>Abstract:</strong> An experiment to determine Young’s Modulus by analyzing the vibrations of an aluminum bar has been conducted. The aluminium bar is vibrated by the magnetic field. A tiny magnet is glued at the free end of the bar. A coil carrying an alternating current generates an alternating magnetic field. The resonance condition is investigated by the measurement of its wavelength using the ImageMeter application. The natural frequency of the aluminum bar is determined from the measurement of its resonance frequencies. The natural frequency and the bar length are used to calculate Young’s Modulus. The experimental data shows the Young’s Modulus of aluminum is . This measurement method is used for learning purposes.</p><p class="KeywordsEngish"> </p><p class="AbstrakIndonesia"><strong>Abstrak:</strong> Telah dilakukan pengukuran nilai Modulus Young dengan analisis getaran dari sebuah batang aluminium. Batang aluminium digetarkan dengan medan magnet. Magnet kecil ditempelkan pada bagian ujung batang aluminium yang bebas. Sebuah kumparan yang berada di bawah ujung batang aluminium  diberi arus bolak balik yang dapat diatur frekuensinya. Pada frekuensi tertentu akan terjadi resonansi dengan mengikuti pola yang khas. Keadaan resonansi batang aluminium ini dibuktikan dari hasil pengukuran panjang λ menggunakan aplikasi <em>ImageMeter</em>. Selanjutnya frekuensi alami batang aluminium ditentukan dari pengukuran frekuensi resonansinya. Nilai Modulus Young aluminium dihitung dari nilai frekuensi alami dan panjang batang. Dari hasil pengukuran diperoleh nilai Modulus Young . Metoda pengukuran ini digunakan untuk keperluan pembelajaran.</p><p class="KataKunci"><strong></strong><em><br /></em></p>

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