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The pre-cracking of wide plate specimens
Gliha, Vladimir ; Rojko, Danilo
The behaviour of uniformly thick small- and large-scale fracture-toughness specimens was analysed during fatigue-crack progression. Because of the increasing crack length, the stiffness of the ...specimens decreases. If cyclic loading is applied in the load-control mode, the stress-intensity factor range, ▫$\Delta$▫K, and crack growth per cycle, da/dN, increase, which is not appropriate for controlling the size of the crack. The increase in ▫$\Delta$▫K for the wide plate (WP) specimens discussed is three times lower than for single edge notch bend (SENB) and compact tension (CT) specimens. The loading range decreases if cyclic loading is applied in the displacement-control mode. The values of ▫$\Delta$▫K and da/dN for SENB and CT specimens then decrease, which is helpful for controlling the crack size; however, they increase for the WP specimens in spite of lowering the loading range. This increase is one third lower than for the load-control mode, which means that it is somewhat easier to control the size of crack.
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