The Crack Tip Opening Displacement in Elastic-Plastic by W. Schmitt, T. Hollstein (auth.), Prof. Dr.-Ing. K. H.

By W. Schmitt, T. Hollstein (auth.), Prof. Dr.-Ing. K. H. Schwalbe (eds.)

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Additional resources for The Crack Tip Opening Displacement in Elastic-Plastic Fracture Mechanics: Proceedings of the Workshop on the CTOD Methodology GKSS-Forschungszentrum Geesthacht, GmbH, Geesthacht, Germany, April 23–25, 1985

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Meth. , 11 (1977),85-98 [3] Drucker, D. , Rice, J. R. Plastic deformation in brittle and ductile fracture Eng. Fract. Mech. J. (1970), 577-602 [4] Shih, C. F. Relationships between the J-Integral and Crack Opening Displacement for Stationary and Extending Cracks Rep No 79CRD075 April 1979, General Electric Company, Corporate Research and Development Schenectady, New York [5] Schwalbe, K. H. Crack tip opening displacement for work hardening materials Rep GKSS 84/E/26, GKSS-Forschungszentrum Geesthacht GmbH, Geesthacht 1984 33 CTOO(RI(E) Fig.

00143 plane stress Fig. 8 -node -elemenfs crack-tip Fig. 3 FE-models of structure ~--­ Q jr ------ b c Fx = scaling factor in x -direction Fy = scaling factor in y -direction Fig. 10- 6 o EPSYS (MISES) -DUGDALE o Fig. 5 load steps Crack opening profile structure E.! 5 position of [TOO DUGDALE EPSYS r/w Fig. 6 J-integral structure E.! (EPSYS) -n=oo ex> 36 n = ex) structure E. I [IT ~:I I I I Fig. ::. 10- 7 EPSYS (MISES) DUGDALE load steps Crack opening profiles struct. I! (EPSYS) - n=oo Fig. I, E.!!

6·ClOD of QPE was used. The five-step load incrementation in Fig. delivers 20 refering to HPE now a ClOD, which is practically equal the estimated one, regarding the used yield function. Also the shape of the crack surface contour deviates only a little from the nearly rectangular opening profile, being characteristic for elasticperfectly-plastic material. A smaller crack-tip element has no further effect on the opening distance, but reduces the irregular drift of the free nodes behind the crack-tip.

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