Issue 42

V. Růžička et alii, Frattura ed Integrità Strutturale, 42 (2017) 128-135; DOI: 10.3221/IGF-ESIS.42.14

u [mm] -27.077 -27.066 -27.034 -26.984 -26.919 -26.843 -26.765 -26.688 -26.618 -26.564 -26.529 -26.517 -26.534 -26.581 -26.659 -26.768 -26.906 -27.069 -27.253 -27.449 -27.651

v [mm] 0.0000 0.0639 0.1325 0.2100 0.3000 0.4072 0.5292 0.6691 0.8250 0.9945 1.1737 1.3584 1.5431 1.7226 1.8915 2.0460 2.1766 2.2843 2.3634 2.4105

Nr.

Node Nr.

Radius [mm]

Theta [deg]

1 2 3 4 5 6 7 8 9

2

0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1

0 9

13 14 15 16 17 18 19 20 21 12 97 98 99

18 27 36 45 54 63 72 81 90 99

10 11 12 13 14 15 16 17 18 19 20 21

108 117 126 135 144 153 162 171 180

100 101 102 103 104 105

87 2.4236 Table 1 : The displacements and polar coordinates of the selected nodes around the crack tip obtained from the ANSYS finite element software.

3PB

[27]

[28]

Data calculated

A 1 A 2 A 3 A 4 A 5

1.8530 -0.3533 -0.7149 -0.0896 -1.3717

1.8538 -0.3527 -0.7202 -0.1019 -1.3565

1.8538 -0.3527 -0.7202 -0.1019

-1.3565 Table 2 : Higher-order terms coefficients determined by means of the ODM in comparison to data published in literature for 3PB, see [27, 28]. On the basis of PHP software [31] the special software tool was programmed considering various levels of rounding numbers in order to analyze how many decimal numbers are needed to obtain precise values of WE terms. The software was based on the idea of representation of numbers by means of strings. The values of the WE terms were calculated step by step assuming two changing parameters: the level of rounding numbers and the number of calculated WE terms.

131