PSI- Issue 9

Khadija Kimakh et al. / Procedia Structural Integrity 9 (2018) 243–249 Khadija.KIMAKH / Structural Integrity Procedia 00 (2018) 000–000

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2. Material and experimental set-up 2.1 Material

The material used in this study was AISI 1045 steel with 0.42 of Carbone. The chemical compositions of the material have been identified by using spectrometer machine. The chemical composition of this steel is given in Table 1. Table1. Chemical composition of AISI 1045

Steel

Chemical composition (%)

AISI 1045

C 0.42

Mn 0.72

S 0.02

P 0.04

Si 0.19

A tensile test was carried out According to the ASTM E8 Standard, to establish mechanical proprieties of the material used. The mechanical proprieties are shown in table2.

Table 2. Mechanical proprieties of AISI 1045.

Steel

Mechanical proprieties

Re 0.2% [MPa]

Rm [MPa]

A %

E [GPa]

AISI 1045

432

645

23

211

2.2. Fatigue test This study aims to analyze the effect of feed rate on fatigue life of the pieces obtained by turning process. Then three batches of specimens were machined. Fatigue tests were carried out on four levels of stress and for each level the fatigue tests were repeated three times. The test specimens were machined by turning process in wet condition. Turning operation was performed using DNMG 11 04 08 insert. A CNC lathe (Alpha 1530XS) was used for the longitudinal turning of the specimens and the cutting conditions employed for machining are listed in Table 3.

Table 3. Cutting conditions

Parameters

Description

Feed rate (mm/rev)

0.05, 0.15, 0.25

Cutting speed (rev/min) Depth of cut (mm) Tool nose radius(mm) Coolant

2000

0.5 0.8 Wet

Specimens are conforming to the standard ASTM 466. Figure 1 present dimension of fatigue specimen with the recommended diameter d =6.35mm.