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Pregled bibliografske jedinice broj: 138013

Zbornik radova

Autori: Matejiček, Franjo; Kozak, Dražan; Konjatić, Pejo
Naslov: Fracture Behaviour of High-Ductile CCT Specimen Under Elastic-Plastic Conditions
Izvornik: Extended Abstracts and Proceedings (CD-ROM Edition)of the 4th International Congress of Croatian Society of Mechanics / Matejiček, Franjo (ur.). - Zagreb : Croatian Society of Mechanics , 2003. 601-608.
Skup: 4th International Congress of Croatian Society of Mechanics
Mjesto i datum: Bizovac, Hrvatska, 18-20.09.2003.
Ključne riječi: CCT Specimen; J-integral; crack growth; J-R curve; crack driving force; FE analysis
Sažetak:
In assessing the integrity of structures containing cracks, it is important to quantify the relevant crack-driving force, so that its load carrying capacity can be predicted. For ductile materials permitting large-scale plasticity near the crack tip, this crack-driving force is frequently described as contour J-integral, which is one appropriate elastic-plastic fracture mechanics (EPFM) parameter (in absence of constraint effects) of low-strength and high-toughness materials. If there is excessive plasticity or significant crack growth, fracture toughness may depend on the size and geometry of the test specimen. Therefore, methodology for J-integral and crack length estimation of a CCT specimen made of high ductile stainless steel is presented in this paper. Estimation is conducted using results gained by experiments and it was confirmed using finite element analysis (FEA). Research was conducted on specimens made of stainless steel X 5 CrNi 18 10, with yielding strength of Rp0, 2=250 MPa and stress of 620 MPa by elongation of about 16%. First series of tests were conducted on specimens prepared for classic tension test to determine real characteristics of material including &#963 ; -&#949 ; diagram, and after on standard CCT specimens with 2a/W = 10/30 = 0, 3. During testing, behind the force F, three characteristic displacements were measured: load line displacement (LLD), crack mouth opening displacement (CMOD) and crack tip opening displacement CTOD (&#948 ; 5). Single specimen method with loading-unloading compliance technique is used to determine compliance of material and hereafter crack extension &#916 ; a. It is often in engineering practice that only J0, 2BL in crack resistance curve J-&#916 ; a could be determined corresponding to the fracture resistance at 0, 2 mm of ductile crack growth. J-integral for CCT specimen has been calculated measuring area under curve in F-LLD diagram. A three-dimensional final element model of CCT specimen was prepared for finite element analysis in Ansys code. Finite element simulations show very good agreement between experimental and numerical results and it can be applied to draw crack driving force.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Cjeloviti rad (više od 1500 riječi)
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0152015, 0152018
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Strojarstvo
Puni text rada: 138013.p179.doc
URL Internet adrese: http://csm.hr/iccsm



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