PSI - Issue 57

7

Amira Aboussalih et al. / Procedia Structural Integrity 57 (2024) 848–858 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

854

The three representations envisaged (Fig 7- a, 7- b and 7-c) all show hysteresis loops in the axial direction with increasing intensities showing progressive rocks. However, Fig 8 illustrates a superposition of the three loadings on different Ratcheting levels. It is admitted that the most relevant plastic strain corresponds to the value of the strongest average stress. Fig. 9 highlights the relationship between the maximum stain as a function of the number of cycles represented by paces showing the impact of the intensity of the average stress on the Ratcheting.

250

200

-100 Axial Stress  xx ( Pa ) 0 100 200

150

-150 Axial Stress  xx ( Pa ) -100 -50 0 50 100

 mean = 100 MPa  a = 100 MPa

 mean = 50 MPa  a = 100 MPa

-200

0,00

0,01

0,02

0,03

0,04

0,05

0,06

0,00

0,01

0,02

A xial Strain  xx (%)

A xial Strain  xx (%)

b)

Déformation a xiale  xx (%) a)

300

250

-50 Axial Stress  xx ( Pa ) 0 50 100 150 200

 mean = 150 MPa  a = 100 MPa

-100

0,00

0,08

A xial Strain  xx (%)

c)

Fig. 7 . Behavior of 316L steel for different loading cases for a constant stress amplitude