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.
184
Made with FlippingBook Ebook Creator