PSI - Issue 68

Victor Rizov et al. / Procedia Structural Integrity 68 (2025) 139–145 V. Rizov / Structural Integrity Procedia 00 (2025) 000–000

143

5

#"! = !

#"! = !

and

.

$ µ ! !

#"!

$ µ ! !

#"! = !

= !

!

Fig. 2. The normalized SERR versus

(curve 1 – for

, curve 2 – for

and curve 3 – for

$ µ ! !

#"!

= !

).

!

Fig. 2 shows how the normalized SERR varies when the value of parameter, , of the angle of twist grows.

#"! = !

#"! = !

#"! = !

!

Fig. 3. The normalized SERR versus

(curve 1 – for

, curve 2 – for

and curve 3 – for

).

µ ! ! !

!

The SERR -

curves in Fig. 2 are built-up at three

ratios to see what is the influence of the variation of

!

µ ! ! ! µ ! ! !

!

!

material parameter,

, along the cross-section radius. It is evident from Fig. 2 that both

and

have ratio

!

!

significant effect on the SERR. The SERR permanently increases as

increases. Increase of

!

induces reduction of the normalized SERR (Fig. 2).