Evaluation of mechanical properties of biodegradable polymers using four-point bending test for microsized test pieces

2019 ◽  
Vol 2019 (0) ◽  
pp. J22308P
Author(s):  
Asahi YONEZAWA ◽  
Ryousuke NIWA ◽  
Kousei IHARA ◽  
Takahiro NAMAZU ◽  
Akira YAMADA
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymers ◽  
Bending Test ◽  
Four Point Bending ◽  
Test Pieces ◽  
Four Point Bending Test

Effects of Sintering Temperature and Excess Zr on Mechanical Properties of Reactive Hot-Pressed ZrB2-ZrCx-Zr Cermets

2016 ◽  
Vol 697 ◽  
pp. 633-638 ◽  
Author(s):  
S.Q. Guo
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Sintering Temperature ◽  
Bending Test ◽  
Cracking Behavior ◽  
Propagation Behavior ◽  
Four Point Bending ◽  
Different Temperatures ◽  
Four Point Bending Test ◽  
Reactive Hot Pressing

In this study, a series of ZrB2-ZrCx-Zr cermets were prepared by reactive hot-pressing of Zr + B4C powder mixtures at different temperatures between 1400°C and 1900°C. The microstructure of the resulting cermets was characterized by field emission scanning electron microscopy. The strength and fracture toughness of the cermets were measured by four-point bending test at room temperature. The results showed that the strength and fracture toughness dependend on the amount of excess Zr and sintering temperature as well. In addition, the crack propagation behavior of the cermets was examined under indent cracking. The cracks induced by indenter directly propagated in the samples with less than 16 vol% Zr. For comparison, the multiple cracking behavior was observed for the samples with equal to or greater than 16% Zr. Furthermore, the effects of compositions and sintering temperatures on the microstructure and the mechanical properties of the cermets were discussed.

scholarly journals Determination of Strength Classes of Selected Nigerian Timbers in Accordance with EN338 (2009)

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Idayat O Sholadoye ◽  
Idris Abubakar
Keyword(s):  
Mechanical Properties ◽  
Limit State ◽  
Physical And Mechanical Properties ◽  
Tectona Grandis ◽  
Bending Test ◽  
Timber Species ◽  
Gmelina Arborea ◽  
Permissible Stress ◽  
Four Point Bending ◽  
Four Point Bending Test

Wood has several unique, independent properties. The physical and mechanical properties of wood do vary from species to species and even within species due to environmental conditions during growth. In Nigeria, timber is been grade based on permissible stress (NCP) an upgrade to the limit state is required. A laboratory test was carried out to develop the physical and mechanical properties (four-point bending test) of the timber species in accordance with EN 13153-1, ASTM D143 and EN 408. The strength classification of selected timber was performed according to EN 338 using characteristic value of the material properties in accordance with EN384 from the generated physical and mechanical properties, after being adjusted to 12% (Eurocodes reference moisture content). The timber species considered were Tectona grandis and Gmelina arborea. The result showed Tectona grandis had a higher property than Gmelina arborea and the species were assigned to strength classes of D50 and D35 (hardwoods) respectively. The study shows that the selected timber species are suitable for structural purposes.Keywords: Strength classes, Nigerian timber, Four-point bending test, Tectona grandis, Gmelina arborea

Sign in / Sign up

Export Citation Format

Share Document