PSI - Issue 71

Priti Kotak Shah et al. / Procedia Structural Integrity 71 (2025) 271–278

276

0.0 2.0 4.0 6.0 8.0 10.0

As-fab HydRim1 HydRim2 HydUni1 HydUni2 HydUni3

Plastic deflection (mm)

Condition of Clad Tube

Fig.11. Bar chart showing variation of plastic deflection for different clad specimens

Fig. 13-16 show different types of yield strength plots. The tangent intersection method (Fig. 12) defines the yield strength as the point of intersection of tangents drawn to the initial elastic and final plastic points of the curve (data point 5 in Fig. 10). We have also taken the vertical projection of this point on the curve (data point 6 in Fig. 10) as one of the yield strengths (Fig. 13).

0 100 200 300 400 500 600 700

Yield Strength (MPa)

As-fab HydRim1

HydRim2

HydUni1

HydUni2

HydUni3

Condition of Clad Tube

Fig.12. Bar chart showing variation of Yield Strength (using tangent intersection method) for different clad specimens

0 100 200 300 400 500 600

Yield Strength (MPa)

As-fab HydRim1

HydRim2

HydUni1

HydUni2

HydUni3

Condition of Clad Tube

Fig.13. Bar chart showing variation of Yield Strength (using tangent intersection method but point on curve) for different clad specimens

Fig. 14 and 15 show the yield strengths computed using Twice Elastic Slope and displacement methods respectively. In Twice Elastic Slope method, the initial elastic slope with respect to the stress axis is calculated and a line of twice that slope is drawn through the curve. The point where the drawn line intersects the curve is assumed to be the yield strength (data point 7 in Fig. 9). In Twice Elastic Displacement method, the linear elastic strain is measured and the stress corresponding to twice that strain is termed as Yield Strength (data points 8 and 9 in Fig. 9 show the linear strain and twice strain points).