PSI - Issue 60

Md Rakim et al. / Procedia Structural Integrity 60 (2024) 298–310 Md Rakim et al. / Structural Integrity Procedia 00 (2023) 000 – 000

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3. Experimental Results

The J-R curve for every fracture toughness test has been developed from Load-LLD and crack growth data and the material’s crack initiation fracture toughness ( J IC ) is estimated according to the ASTM E 1820-13 standard as shown in Figs. 3, 4, 5, 6, 7 and 8 below.

800

1000

800

600

600

Model

Allometric1 y = a*x^b

Model

Allometric1 y = a*x^b J-Integral

Equation

Equation

Plot

J-Integral

Plot

a b

397.92816 ± 3.806 0.69515 ± 0.01958

400

a b

423.53127 ± 3.086 0.5328 ± 0.01362

Reduced Chi-Sqr R-Square (COD)

344.73464

Reduced Chi-Sqr R-Square (COD)

294.8083 0.98349

0.98478 0.98419

Adj. R-Square

400

Adj. R-Square

0.983

1.5 mm Exclusive Line 0.2 mm Offset Line 0.15 mm Exclusive Line Blunting line

1.5 mm Exclusive Line 0.2 mm Offset Line Blunting line 0.15 mm Exclusive Line

200

200 J-Integral (MPa.mm)

J-Integral (MPa.mm)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0

Crack Growth (mm)

Crack Growth (mm)

Fig.3: J-R curve at 27 °C with as-received condition for base material Fig.4: J-R curve at 750 °C with 5000 hours ageing condition for base material

1200

750

1000

600

800

450

Allometric1

Model

Model

Allometric1 y = a*x^b

600

y = a*x^b J-Integral

Equation

Equation

Plot

J-Integral

Plot

579.61209 ± 5.4197 0.76883 ± 0.0151

a b

310.74384 ± 3.672 0.81441 ± 0.02546

a b

300

2157.85292

Reduced Chi-Sqr R-Square (COD)

391.84676

Reduced Chi-Sqr R-Square (COD)

0.97534 0.97509

0.97789 0.97722

400

Adj. R-Square

Adj. R-Square

1.5 mm Exclusive Line 0.2 mm Offset Line 0.15 mm Exclusive Line Blunting line

1.5 mm Exclusive Line 0.2 mm Offset Line 0.15 mm Exclusive Line Blunting line

J-Integral (MPa.mm)

150 J-Integral (MPa.mm)

200

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0

Crack Growth (mm)

Crack Growth (mm)

Fig.5: J-R curve at 27 °C with as-received condition for weld material Fig.6: J-R curve at 750 °C with 5000 hours ageing condition for weld material