Issue 43

F. Berto et alii, Frattura ed Integrità Strutturale, 43 (2018) 1-32; DOI: 10.3221/IGF-ESIS.43.01

The problem considered here, as example, is a finite size plate containing a sharp V-notch, subjected to a remote shear stress. The geometry of the problem is shown in Fig. 5. The V-notch is characterized by a notch opening angle, 2 α and a depth, a. The base and the height of the plate are 2 W and W , respectively, while the plate thickness is 2 t . To observe the dependence of the intensity and singular power of singular modes as a function of the notch angle, a range of finite element models are developed for notch angles of 2 α = 45 o , 60°, 90 o , 102.6 o , 120° and 135°. A typical example of the stress field through the thickness of the plate is shown in Fig. 6 at different distance from the notch tip [94-97].

Figure 5: V-notch in a plane and in a three-dimensional plate.

1200

2  =60°  0

=100 MPa

1000

800

r=0.05 mm

 xy

(Mode II)

r=0.1 mm

600

400

r=0.05 mm

r=0.3 mm

r=0.1 mm

200

0

r=0.3 mm

-200

 yz

(Mode O)

-400

-20

-15

-10

-5

0

5

10

15

20

Figure 6: Mode II and mode O stress components plotted throughout the plate thickness (along the notch bisector line) at three different distances r from the point of singularity ( r=x ).

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