Experimental investigation of shear stress effect on the flexural behavior of aluminum foam beam
Triawan F.a, Nakagawa R.b, Inaba K.b, Budiman B.A.c, Kishimoto K.b
a Faculty of Engineering and Technology, Sampoerna University, Jakarta, Indonesia
b School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
c Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Bandung, Indonesia
Abstract
© 2020, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.We conducted an experimental investigation on the flexural behavior of closed-cell aluminum foam beam under shear stress effect. Three-point bending and flexural vibration tests were carried out and the shear stress effect was generated by changing the specimen’s length. From the bending test, the measured deflection was used to quantify the flexural modulus. From the vibration test, the measured natural frequencies of flexural vibration mode were used to calculate the flexural modulus. The results show that the flexural moduli obtained from both tests agree well. Then, the flexural modulus value was compared with the theoretical value estimated by Timoshenko’s beam theory. As a result, the experimental value was found to be much smaller than the theoretical value when shear stress effect is dominant. Does this mean Timoshenko’s theory cannot describe the flexural behavior of aluminum foam beam? How to fit Timoshenko’s theory with the experimental data is discussed. Moreover, the reason why the flexural modulus was remarkably degraded under shear effect is elaborated.
Author keywords
Closed-cell aluminum foam,Experimental investigations,Experimental values,Flexural behavior,Flexural vibration modes,Flexural vibration tests,Theoretical values,Three point bending
Indexed keywords
Aluminum foam beam,Elastic modulus,Flexural behavior,Shear effect,Timoshenko’s beam theory
Funding details
Authors would like to thank Dr. Toru Hashimura of Kobe Steel, Ltd. for the valuable discussion in analyzing the experimental data.