Issue 35

J. Albinmousa, Frattura ed Integrità Strutturale, 35 (2016) 182-186; DOI: 10.3221/IGF-ESIS.35.21

ε a

γ a

σ a

τ a

N f

(%)

(%)

(MPa)

(MPa)

No.

Loading

Axial

0.300 0.231 0.202 0.346 0.231 0.202 0.231

0.00 0.40 0.35 0.60 0.40 0.35 0.40

207.1 161.0 138.0 247.7 161.8 143.8 163.9

0.0

28,600 47,500 57,845 2,700 28,500 40,860 20,900

1 2 3 4 5 6 7

0 0

103.0 103.1 157.8 105.9 113.8 131.8

90 90 90 45

Table 1 : Summary of cyclic tests for AlMg4.5Mn [8].

225

1500

90

90

No. 1

No. 2

60

60

150

1000

30

30

-30 Orientation ( ° ) 0

-30 Orientation ( ° ) 0

beta Max Normal Max Shear

beta Max Normal Max Shear

Length Exp Fit

Length Exp Fit

75

500

Crack length (μm)

Crack length (μm)

-60

-60

-90

0

-90

0

0.0

0.2

0.4

0.6

0.8

1.0

0.0

0.2

0.4

0.6

0.8

1.0

N/Nf

N/Nf

90

225

90

160

No. 3

No. 4

60

60

120

30

150

30

-30 Orientation ( ° ) 0

-30 Orientation ( ° ) 0

beta Max Normal Max Shear

beta Max Normal Max Shear

80

Length Exp Fit

Length Exp Fit

75

Crack length (μm)

Crack length (μm)

40

-60

-60

-90

0

0

-90

0.0

0.2

0.4

0.6

0.8

1.0

0.0

0.2

0.4

0.6

0.8

1.0

N/Nf

N/Nf

90

2000

90

160

No. 6

No. 5

60

60

1500

120

30

30

-30 Orientation ( ° ) 0

-30 Orientation ( ° ) 0

beta Max Normal Max Shear

beta Max Normal Max Shear

1000

80

Length Exp Fit

Length Exp Fit

Crack length (μm)

Crack length (μm)

500

40

-60

-60

-90

0

-90

0

0.0

0.2

0.4

0.6

0.8

1.0

0.0

0.2

0.4

0.6

0.8

1.0

N/Nf

N/Nf

90

1600

No. 7

60

1200

30

-30 Orientation ( ° ) 0

beta Max Normal Max Shear

800

Length Exp Fit

Crack length (μm)

400

-60

-90

0

0.0

0.2

0.4

0.6

0.8

1.0

N/N f

Figure 2 : Variations of projected angle β and crack length with cycling. Planes of maximum normal and maximum shear strains are indicated by red-dashed and green-dashed lines, respectively.

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