Pregled bibliografske jedinice broj: 16986
Risk Minimization in the Designing Procedure
Risk Minimization in the Designing Procedure // Proceedings of the 5th International Design Conference, Design '98 / Marjanović, Dorian (ur.).
Zagreb: Sveučilišna tiskara, 1998. str. 629-634 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 16986 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Risk Minimization in the Designing Procedure
Autori
Jecić, Stjepan ; Semenski, Damir
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings of the 5th International Design Conference, Design '98
/ Marjanović, Dorian - Zagreb : Sveučilišna tiskara, 1998, 629-634
Skup
5th International Design Conference, Design '98
Mjesto i datum
Dubrovnik, Hrvatska, 19.05.1998. - 22.05.1998
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
fracture mechanics; experimental methods; stress intensity factors; stress concentration factors; method of caustics
Sažetak
The great number of numerical and experimental techniques in fracture mechanics, such as the
linerisation of stress concentration factors or multi-parameter methods of fringe analysis in
photoelasticity, are employed for determining the stress intensity factors (SIF) of the cracks in
deformed structures. The optical method of caustics is originally applied to mechanically isotropic materials,
where the proces of evaluation of SIFs is reduced to the epicycloidal dark spot measuring. The
reflection method of caustics is presented here as a new developed for the application to
nontransparent mechanically anisotropic materials such as fibe reinforced composites. The
size of the dark spot depends upon the load intensity, while its shape depends extremely upon
the mehhanical properties of the material and the position of cracktip. The optical effect needs
to be digitized and analyzed by the automatic image analyzer that enables the filtering of the
image, necessary for dark zone boundary recognition and extraction of the foggy blurred zones.
This makes possible to use the classical diametar measuring technique or advanced
multi-point over-deterministic data reduction method. The evaluation process includes
variations of SIFs and simulations of caustics for all possible situations and comparison of the
simulated caustic area with characteristics points discarded from experimental image. The
problem of detecting the border of the dark spot is solved by new developed differential
method, shifting the real image into the gradient image and collecting the points located at the
position of the maximum light intensity gradient. All computer programs are adapted to use
these techniques as automatic and standard procedure, effectively increasing the possibilities
of image analysis of experimental caustics.
Izvorni jezik
Engleski
Znanstvena područja
Strojarstvo