Issue 49

M. J. Adinoyi et alii, Frattura ed Integrità Strutturale, 49 (2019) 487-506; DOI: 10.3221/IGF-ESIS.49.46

Although both the Basquin curve and three-parameter curve are similar, however, the latter curve shows a slightly better correlation for the experimental data.

d (mm)

ε a (%)

σ max (MPa) 249.63 281.78 344.75 320.03 404.14 404.92 469.36 520.21 519.37 493.4

σ min (MPa)

σ a (MPa) 236.38 244.06 327.36 316.64 401.87 473.33 471.45 513.47 512.25 399.1

σ m (MPa)

ε e (%)

ε p (%)

N f (Cycle)

Spec. ID

100,000 (stopped)

63448C

6.37

0.3

-223.12

13.26

0.3

0

63449C 63446C 63447C 63444C 63445C 63450C 63452C 63451C 63453C

6.37 6.36 6.37 6.36 6.36 6.36 6.36 6.37 6.36

0.3 0.4 0.4 0.5 0.5 0.6 0.6 0.7 0.7

-206.33 -309.97 -313.24 -394.06 -398.82 -453.25 -473.54 -506.73 -505.12

37.73 18.39

0.3 0.4 0.4 0.5 0.5 0.6 0.6 0.6 0.6

0 0 0 0 0 0 0

156375 23066 37215

3.39 5.04 3.05

8925 6875 1816 2966

20.08 -2.09

6.74 7.13

0.1 0.1

785 929

Table 3 : Axial strain-controlled fatigue parameters and results.

1000

Stress amplitude (MPa)

100

1,E+03

1,E+04

1,E+05

1,E+06

Number of reversals to failure

Figure 11 : Regression curve to evaluate fatigue properties.

Al alloys

σ f ‘ (MPa)

b

ε f ‘

c

ref

AW2099-T83

1650.3

-0.151 -

-

Present work

2024-T3 6060-T6 6082-T6

850

-0.086 0.22

-0.462 [43]

376.5 486.8

-0.084 0.157 -0.537 [44]

-0.07 0.209 -0.593 [44] Table 4 : Comparison of fatigue constants of the present alloy with conventional Al alloys.

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