Issue 41

M. Vormwald et alii, Frattura ed Integrità Strutturale, 41 (2017) 314-322; DOI: 10.3221/IGF-ESIS.41.42

θo [deg]

θo vs a*. R-030

a*[mm]

0

ΔK vs a*. R-030

[MPa√m]

3

4

5

6

7

8

9

10

0 20 40 60 80 100

ΔKI

ΔKII

ΔKIII

-10

ΔK S3D ΔK ES

-20

θo θo S3D θo ES

-30

-40

2

4

6

8

10

a*[mm]

-50

ΔKi/ΔK I

θo[deg]

ΔKi/ΔK I

vs a* R-030

K I

vs K II

[MPa√m]. R-030

K II

2,0

-90 -80 -70 -60 -50 -40 -30 -20 -10 0

15 25 35 45 55 65

7500 9200 9600 10800 12000 13500 14000 14250

1,5

1,0

0,5

-25 -15 -5 5

K I

-25 -15 -5 5 15 25 35 45 55 65

0,0

2

3

4

5

6

7

8

9 10

a*[mm]

ΔKII/ΔKI

ΔKIII/ΔKI

θo

Figure 6: Crack tip parameters measured and calculated for specimen R-030, proportional tension and torsion loads.

10 30 50 70 2 4 6 8 10 12 14 16 18 20 θo [deg] a*[mm] θo vs a*. R-031 θo θo S3D θo ES

ΔK vs a*. R-031

[MPa√m]

100 120

ΔKI ΔKII ΔKIII ΔK S3D

0 20 40 60 80

-70 -50 -30 -10

a*[mm]

2 4 6 8 10 12 14 16 18 20

ΔKi/ΔK I

ΔKi/ΔK I

vs a* R-031

θo[deg]

2,0

K I

vs K II

[MPa√m]. R-031

15 30 45

K II

20 40

1,5

-90 -75 -60 -45 -30 -15 0

K I

-60 -40 -20 0

1,0

-60

-40

-20

0

20

40

32400 32000 31500 30500 30000 28000 23500

0,5

0,0

2 4 6 8 10 12 14 16 18 20

a*[mm]

ΔKII/ΔKI

ΔKIII/ΔKI

θo

Figure 7: Crack tip parameters measured and calculated for specimen R-031, phase shift 90° between tension 33kN and torsion 382Nm loads.

319