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Fracture Behaviour of High-Ductile CCT Specimen Under Elastic-Plastic Conditions (CROSBI ID 494573)

Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija

Matejiček, Franjo ; Kozak, Dražan ; Konjatić, Pejo Fracture Behaviour of High-Ductile CCT Specimen Under Elastic-Plastic Conditions // Extended Abstracts and Proceedings (CD-ROM Edition)of the 4th International Congress of Croatian Society of Mechanics / Matejiček, Franjo (ur.). Zagreb: Hrvatsko društvo za mehaniku (HDM), 2003. str. 601-608-x

Podaci o odgovornosti

Matejiček, Franjo ; Kozak, Dražan ; Konjatić, Pejo

engleski

Fracture Behaviour of High-Ductile CCT Specimen Under Elastic-Plastic Conditions

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.

CCT Specimen; J-integral; crack growth; J-R curve; crack driving force; FE analysis

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Podaci o prilogu

601-608-x.

2003.

objavljeno

Podaci o matičnoj publikaciji

Extended Abstracts and Proceedings (CD-ROM Edition)of the 4th International Congress of Croatian Society of Mechanics

Matejiček, Franjo

Zagreb: Hrvatsko društvo za mehaniku (HDM)

Podaci o skupu

4th International Congress of Croatian Society of Mechanics

predavanje

18.10.2003-20.10.2003

Bizovac, Hrvatska

Povezanost rada

Strojarstvo

Poveznice