Fatigue Crack Paths 2003

stress, σθ, calculated at r=L/2, the θLM angle value maximising the fatigue damage

calculated according to the LM, eq. (1), and the θρ angle giving the direction that

minimised the ρ value.

As example, in fig. 3 it has been reported, one for each tested specimen

configuration, the picture of the crack path, with a magnification of 10X, and the stress

field, determined by the FE analyses, in terms of stress normal and tangential to the

crack propagation straight lines. The plotted stress fields have been determined by FEs

under the maximumvalue of the applied force.

Sp. Code a rn rn/a ββ

w Fa Nf Run θθA rA θθB rB ρρ θθLM θθρρ

[°] [°]

[mm] [mm]

[°] [mm] [kN] [Cycles] Out [°] [mm] [°] [mm]

90_05_1 4.92 0.075 0.01557° 28'10.05 2.50 33060

-19.20.384-31.4 0.6 0.34

90_05_2 5.02 0.081 0.01657° 32' 10.1 1.802000000 X

0.6

90_05_3 5.16 0.072 0.01457° 32'10.15 2.50 46888

-22.5 0.6 0.29

90_05_4 5.06 0.031 0.00657° 28'10.15 2.20 127582

-47.9 0.6 0.05 -38.2-29.2

90_05_5 5.17 0.081 0.01657° 33' 10 2.00 574377 -41.30.506-46.7 0.6 0.03

90_05_6 4.95 0.075 0.01558° 04'10.05 1.90 607433 -39.40.370-48.5 0.6 0.06

90_05_8 5.09 0.064 0.01357° 08'10.15 1.90 992992 46.1 0.436 50.4 0.6 25.00

90_03_1 2.93 0.071 0.02456° 24' 6.1 1.75 19046

-21.90.271-19.5 0.6 2.00

90_03_2 2.96 0.066 0.02256° 51' 6.1 1.55 35288

29.3 0.545 28.0 0.6 3.34

90_03_4 3.03 0.088 0.02957° 25' 6.05 1.001660181 48.7 0.171 35.7 0.6 3.34

90_03_5 3.11 0.035 0.01157° 46' 6.1 1.001405877 41.7 0.504 43.3 0.6 12.50 -39.1-30.3

90_03_6 2.93 0.07 0.02457° 03' 6.1 1.10 479980 59.8 0.477 54.9 0.6 12.50

90_03_8 2.92 0.154 0.05357° 03' 6.05 1.20 462696 50.1 0.370 44.7 0.6 2.50

90_03_9 3.02 0.078 0.02657° 05' 6.1 1.10 840286 62.4 0.532 51.2 0.6 0.91

60_05_1 4.89 0.073 0.01557° 12'10.15 2.50 52749

-21.00.572-22.9 0.6 0.07

60_05_2 5.08 0.081 0.01657° 64' 10.1 2.50 47024

-31.30.264-49.1 0.6 0.04

60_05_3 4.99 0.068 0.01457° 22' 10.1 1.90 340645 -31.90.218-26.7 0.6 0.05

60_05_4 4.82 0.076 0.01657° 38' 10.1 1.90 369109 -42.00.462-45.5 0.6 0.16

60_05_5 4.79 0.079 0.01657° 31' 10.1 1.652077381 -48.10.266-52.2 0.6 0.23 -25.0-16.8

60_05_6 5.12 0.088 0.01757° 13' 10.1 1.75 659765

-51.3 0.6 0.26

60_05_7 5.06 0.083 0.01657° 08'10.15 1.65 575553

-55.3 0.6 0.31

60_05_8 4.92 0.075 0.01557° 18' 10.1 1.75 745632 -36.90.155-54.9 0.6 0.14

60_05_9 5.03 0.068 0.01457° 56' 10.1 1.65 534420 -43.80.157-53.4 0.6 0.18

60_03_1 3.01 0.065 0.02257° 21' 5.8 1.20 173467 -16.80.358-30.0 0.6 0.08

60_03_2 3.02 0.073 0.02457° 58' 5.75 1.00 674133 -40.10.308-49.6 0.6 0.17

60_03_3 2.99 0.082 0.02757° 62' 5.93 1.00 552233

-51.2 0.6 0.29

60_03_4 2.98 0.081 0.02757° 05' 5.88 1.20 365249 -28.50.213-49.6 0.6 0.04

60_03_5 2.98 0.088 0.03 57°18' 5.8 0.902000000 X

0.6

-24.3-16.3

60_03_6 3.06 0.091 0.03 57° 43' 5.82 0.95 994062 -50.50.315-54.1 0.6 0.29

60_03_7 2.88 0.078 0.02757° 09' 5.93 0.951568092 -52.00.220-56.7 0.6 0.30

60_03_8 2.82 0.079 0.02857° 33' 6.01 1.45 53815

-30.00.428-34.8 0.6 0.06

60_03_9 3.11 0.072 0.02357° 61' 5.95 1.45 63742

-14.20.495-18.5 0.6 0.11

Table 1. (Caption on next page)