PSI - Issue 18

G.M. Dominguez Almaraz et al. / Procedia Structural Integrity 18 (2019) 594–599 Author name / Structural Integrity Procedia 00 (2019) 000–000

596

3

Fig. 2. Modal numerical simulation to obtain the natural frequency of vibration in the longitudinal direction, for the two tested steels.

Table 1. Chemical composition and principal mechanical properties of 4041T steel.

Element

C

Mn

Si

Cr 1.0

Mo

P

S

Fe

% in weight

0.4

0.9

0.3

0.20

0.035

0.04

Balance

Density (Kg/m 3 )

Hardness (Brinell)

E (GPa)

Poisson ratio

 y (MPa)

 u (MPa)

Property

value

7850

321

415

655

210

0.29

Table 2. Chemical composition and principal mechanical properties of 1045 steel.

Element

C

Mn

P

S

Fe

% in weight

0.4 – 0.5 Density (Kg/m 3 )

0.6-0.9

0.04

0.05

Balance

Hardness (Brinell)

E (GPa)

Poisson ratio

 y (MPa)

 u (MPa)

Property

value

7870

163

310

565

206

0.29

In order to calibrate the ultrasonic fatigue testing, additional numerical simulations were carried out to determine the relationship between the displacements imposed at the ends of testing specimens, and the induced higher stress at the neck section of specimens. In Figure 3 is illustrated the concerning numerical results: for a displacement of 12.5  m at the end of specimens, the higher induced stress at the neck section was close to 200 MPa. Then, with the use of a inductive proximity sensor, the physical displacement were measured at the free end of specimen to find the linear relationship under ultrasonic fatigue tests: physical displacement at the end of specimen and higher stress induced at the neck section of specimen.