Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: mechanical anisotropy

Sortuj według:

Ogranicz wyniki do:

Compressive properties, mechanical anisotropy and hardness analysis of Mg-Zn alloy under cross pre-compression

Long Jianyu, Nazeer Faisal, Yang Zhe, Li Chuan

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 4

355--367

The Mg–6Zn wt.% (MZ-T6) magnesium (Mg) alloy was fabricated after heat treatment (783 K for 6 h and aging at 453 K for 24 h) of an extruded MZ Mg alloy. Later, the alloy was subjected to cross pre-compression along with different directions and strains and obtained MZ-1 and MZ-2Mg specimens. The MZ-1 was pre-compressed along with ED and then TD, whilst MZ-2 was pre-compressed along with ND and TD. Subsequently, the compressive properties were studied of MZ-T6, MZ-1, and MZ-2 specimens. The result displayed that the cross twinning and lenticular twinning significantly altered the < c > axis orientations from c-axes || normal direction (ND) of MZ-T6 Mg specimen towards c-axes || extruded direction (ED) and transverse direction (TD) in MZ-1 and MZ-2Mg specimens, respectively. The compressive yield strength and ultimate compressive strength were significantly increased along with all loading directions, and mechanical anisotropy was significantly reduced. These results are mainly attributed to twin-induced grain refinement and considerable changes in the texture. The concave down curves changed to sigmoidal curves in pre-compressed Mg specimens along with ND, which is the signature of the twinning and de-twinning phenomenon. While loading along ED and TD exhibited almost similar sigmoidal curves in all specimens, however, the curves displayed different deformation behavior and were evaluated based on strain hardening regimes. The hardness of MZ-1 and MZ-2 specimens was increased ~ 18 and ~ 23%, respectively, compared to the MZ-T6 specimen. Thus, cross pre-compression is a convenient technique to further enhance the applications of Mg alloys for industrial development.

Selection of Wood Based on Acoustic Properties for the Solid Body of Electric Guitar

Zorič Anton, Kaljun Jasmin, Žveplan Ervin, Straže Aleš

Archives of Acoustics

2019

Vol. 44, No. 1

51--58

For the purpose of making of a solid body of an electric guitar the acoustic- and mechanical properties of walnut- (Juglans regia L.) and ash wood (Fraxinus excelsior L.) were researched. The acoustic properties were determined in a flexural vibration response of laboratory conditioned wood elements of 430 × 186 × 42.8 mm used for making of a solid body of an electric guitar. The velocity of shearand compression ultrasonic waves was additionally determined in parallel small oriented samples of 80 × 40 × 40 mm. The research confirmed better mechanical properties of ash wood, that is, the larger modulus of elasticity and shear modules in all anatomical directions and planes. The acoustic quality of ash wood was better only in the basic vibration mode. Walnut was, on the other hand, lighter and more homogenous and had lower acoustic- and mechanical anisotropy. Additionally, reduced damping of walnut at higher vibration modes is assumed to have a positive impact on the vibration response of future modelled and built solid bodies of electric guitars. When choosing walnut wood, better energy transfer is expected at a similar string playing frequency and a structure resonance of the electric guitar.

Microstructure and texture of PM2000 tubes - correlation with multiaxial creep and failure behaviour.

Wasilkowska A., Ratuszek W., Penkalla H.J., Kędzierski Z., Czyrska-Filemonowicz A.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1187-1190

A relationship between the microstructure and multiaxial creep properties of PM2000 tubes is discussed. The microstructure was investigated by X-ray diffraction, optical metallography, scanning- and transmission electron microscopy (TEM). Creep properties were established at 1000 degrees centigrade under multiaxial loading. The results show a low creep ductility and intergranular failure of tubes at high temperatures, related to the microstructural and mechanical anisotropy. The development of a special pancake grain structure is seen as a factor for increasing the life time of tubes subjected to multiaxial creep.