Dziho, Edin

Isic, Safet

Sunje, Edin

English

DSpace at VSB Technical University of Ostrava

IT!f\lLIBJ Sborník vědeckých prací Vysoké školy báňské - Techni�lte UHlvetzhy t,stt au ·. Jčíslo 3, rok 2009, ročník Lil, řada hutnická, článek č. 1529 Edin DZIHO, Edin SUNJE, Safet ISIC1 MEASUREMENT OF ELASTICITY MODULUS USING ULTRASONIC AND VIBRA TION METHOD MĚŘENÍ MODULŮ ELASTICITY POMOCÍ ULTRAZVUKOVÝCH A VIBRAČNÍCH METOD Facu/ty o/ Mechanica/ Engineering, Mostar, Bosnia and Herzegovina Abstract In this paper determination of elasticity modulus using nondestructive ultrasonic and vibration methods is presented. Ultrasonic method was done by high precision ultrasonic thickness gauge. In a tested piece. of known dimensións sound velocity is measured. From measured velocity statical and dynamical elasticity modulus was calculated. In vibration method, natural frequency of transverse vibration of tested piece was measured using high sensitivity accelerometer. Tested specimen was treated as Bernoulli cantilever beam. Modulus of elasticity was determined by putting values of natural frequency, moment of inertia and length of tested piece in expression for natural frequency for this kind of beam. From results analysis for these two methods arises the possibility of their using for quick, cheap and nondestructive determination of elasticity modulus. Key words: modulus of elasticity, measurement, ultrasonic, vibration 1. IntroductionModulus of elasticity is one of the primary and certainly the most important characteristics ofmaterials from the viewpoint of mechanical characteristics. All calculations of mechanical constructions perform in the elastic field of material, therefore, modulus of elasticity of material is a constant that is relevant for these calculations. It is usual that modulus of elasticity of solid bodies is determined by testing materials on the backlash, which is performed on tensile test machine. For these tests is necessary to prepare specimen accurately defined by the rules. Besides that, this process of preparing specimen is rather demanding process and this testing is high expensive. In addition, modulus of elasticity is a constant of the material on which depend some other properties of materials such as the spreading speed of sound in the material, natural frequencies, etc. If the dependence between these features and modulus of elasticity is known, it is possibte to indirectly measure modulus of elasticity of the material by measuring these features. ln this paper is made a comparison of two indirect methods of measurement modules of elasticity, the first one is ultrasound measuring modulus of elasticity, and the other one is based on the beam natural frequency measurement. 2. Specimen propertiesExperiment is done on specimens that are made of high-alloyed Cr - Ni steel. Five specimenswere made from plate of nominal thickness value 16 mm. Specimen dimensions were measured using sliding caliper of accuracy 0.05 mm, while the mass is measured with precision scale of accuracy0.01 g. Density of each specimen was calculated using measured values of dimensions and mass. These specimen characteristics are given in the Tahle 1. 33 

Měření modulů elasticity pomocí ultrazvukových a vibračních metod

http://dspace.vsb.cz/bitstream/10084/77797/2/VSB%20HUF%202009-3_7_Dziho.pdf

Měření modulů elasticity pomocí ultrazvukových a vibračních metod

Abstract

Similar works

Full text

Available Versions

DSpace at VSB Technical University of Ostrava