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Sub-sized CVN specimenconversion methodology

ASTM A01-13 meeting Tampa 2015Kim Wallin

Uper shelf"Ductile"

CV

[J]

T [0C]

Lower shelf"Brittle"

Transition region

221/10/2015 2

ASTM A370 Table 9

Table 9 is based on asimple thickness-ratiocorrection.

0

10

20

30

40

50

60

0 5 10 15 20 25 30 35 40 45

3/4 2/3 1/2 1/3 1/4

KVB [J]

KV 10

[J]

ASTM A370 Table 9

Subsized specimens

0 50 100 150 2000

20

40

60

80

100

1/22/31/1

KV 5x

10[J

]

KV10x10 [J]

A simple ratio-correction

is not sufficient for the

adjustment of sub-size

Charpy-V specimenenergies.

Sub-size specimens yield higher absolute energies

Sub-size specimens yield lower proportional energies

421/10/2015 4

Effect of thickness on transition curve

-100 -50 0 50 100 1500

20

40

60

80

100

120

140

1.25 2.5 5 10 15

KV/

(Bb)

[J/c

m2 ]

T [oC]

McNicol 1965

McNicol, R. (1965, September). Correlation of Charpy Test Results for Standard and Nonstandard Size Specimens.Welding Research Supplement, pp. 385-393.

Subsized specimensSub-size specimens yield lower transition temperature

Included inBS7910-13Included inBS7910-13

Wallin K. Methodology for selecting Charpy toughness criteria for thin high strength steels - Part 1:Determining the fracture toughness: D733. Jernkontorets Forskning, 1994.

0 2 4 6 8 10 12-100

-80

-60

-40

-20

0

20 95 %

5 %

THICKNESS CORRECTIONFOR CVN TRANSITION TEMPERATURE

TCV28J = TCV35J/cm2 - 51.4 ln{2 (B/10)0.25-1}

T 5 0C

TCV3

5J/c

m2-T

CV2

8J[o C

]

B [mm]

ASME UG-84.2

Towers

Similar to astatistical sizeeffect related tocleavage initiation.See e.g. ASTME1921.

Subsized specimensSub-size specimens yield lower transition temperature

Similar to astatistical sizeeffect related tocleavage initiation.See e.g. ASTME1921.

Included inBS7910-13Included inBS7910-13

Wallin K. Methodology for selecting Charpy toughness criteria for thin high strength steels - Part 1:Determining the fracture toughness: D733. Jernkontorets Forskning, 1994.

0 2 4 6 8 10 12 14 16 18 20 22-100

-80

-60

-40

-20

0

2095 %

5 %

THICKNESS CORRECTIONFOR CVN TRANSITION TEMPERATURE

TCV28J = TCV35J/cm2 - 51.4 ln{2 (B/10)0.25-1}

T 5 0C

TCV3

5J/c

m2-T

CV2

8J[o C

]

B [mm]

ASME UG-84.2

Towers

Subsized specimensSub-size specimens yield lower proportional upper shelf energies

0 50 100 150 200 250 300 3500

50

100

150

200

250

300

350

CVB

-US/(B

b)[J

/cm

2 ]

CV10-US/0.8 [J/cm2]

20 mm 9 mm 8 mm 7.5 mm 7 mm 6.7 mm 6 mm 5 mm 4 mm 3.6 mm 3.3 mm 3 mm 2.5 mm

Some shearand some flatfracture.

All shearfracture.

dcgs s s

Some shearand some flatfracture.

All shearfracture.

Some shearand some flatfracture.

Some shearand some flatfracture.

All shearfracture.All shearfracture.

dcgs s s

Due to a competitionbetween shear and flatfracture.

Wallin K Upper shelf energy normalisation for sub-sized Charpy-V specimens. Int J of Pressure Vessels and Piping,78, 2001, pp 463-470.

Subsized specimensSub-size specimens yield lower proportional upper shelf energies

0 20 40 60 80 100 1200.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1

CV10-US/B [kN]

(CVB

-USx1

0)/(C

V10-

USxB

)

1.0

0.5

All shear

Wallin K Upper shelf energy normalisation for sub-sized Charpy-V specimens. Int J of Pressure Vessels and Piping,78, 2001, pp 463-470.

Subsized specimensSub-size specimens yield lower proportional upper shelf energies

Wallin K Upper shelf energy normalisation for sub-sized Charpy-V specimens. Int J of Pressure Vessels and Piping,78, 2001, pp 463-470.

Normalisation isinsensitive tostrength butsensitive to modulusof elasticity .Austenitic stainlessslightly different thanstructural steel.

Subsized specimensSub-size specimens yield lower proportional upper shelf energies

0

100

200

300

400

500

0 50 100 150 200 250 300 350

THICKNESS CORRECTION FOR UPPER SHELF

Mean predictions

KVB/(0.8xB) [J/cm2]

KV10

/0.8

[J/c

m2 ]

B = 7.5 mmB = 5 mmB = 3.3 mmB = 2.5 mm

Wallin K Upper shelf energy normalisation for sub-sized Charpy-V specimens. Int J of Pressure Vessels and Piping,78, 2001, pp 463-470.

Temperature adjustment

Energy conversion

• The conversion accounts for the lower energy requiredto fracture shear lips.

• CV10-US corresponds basically to a value without shearlips.

• For high CVN energies the measured full size specimenenergy becomes therefore less than indicated by theequation.

• Begins to effect when CV10 > 100 J.

0

100

200

300

0 50 100 150 200

KV3/4

KV2/3

KV1/2

KV1/3

KV1/4

KVB [J]

KV 10

[J]

Energy conversion

Estimatedmeasuredenergy.

-20 0 20 40 60 80 100 120 140 1600

20

40

60

80

100

120

140

160

McNicol 1965

1.25 2.5 5 10 15

KV 10

est/(

Bb)

[J/c

m2 ]

Tadjusted [oC]

McNicol, R. (1965, September). Correlation of Charpy Test Results for Standard and Nonstandard Size Specimens.Welding Research Supplement, pp. 385-393.

-200 -100 0 100 200 300 4000

5

10

15

20

25

30

35

40

45

50

10 7.5 5 2.5

KV 10

est[J

]

Tadjusted [oC]

4340 low toughness

Enrico Lucon, C. N. (2015). Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub-Size andMiniaturized Charpy Specimens. NIST Technical Note 1858.

y 1480 MPa

Enrico Lucon, C. N. (2015). Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub-Size andMiniaturized Charpy Specimens. NIST Technical Note 1858.

-200 -150 -100 -50 0 50 1000

20

40

60

80

100

120

140

4340 high toughness

10 7.5 5 2.5

KV 10

est[J

]

Tadjusted [oC]

y 952 MPa

Enrico Lucon, C. N. (2015). Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub-Size andMiniaturized Charpy Specimens. NIST Technical Note 1858.

-200 -150 -100 -50 0 50 100 1500

50

100

150

200

250

300

T200

10 7.5 5 2.5

KV 10

est[J

]

Tadjusted [oC]

y 1134 MPa

E. Lucon, C. N. McCowan, and R. L. Santoyo, (2015). Impact Characterization of Line Pipe Steels by Means of Standard,Sub-Size and Miniaturized Charpy Specimens. NIST Technical Note 1865.

-100 -50 0 50 100 150 200 2500

10

20

30

40

50

60

70

80X52

10 6.67 5

KV 10

est[J

]

Tadjusted [oC]

y 325 MPa

E. Lucon, C. N. McCowan, and R. L. Santoyo, (2015). Impact Characterization of Line Pipe Steels by Means of Standard,Sub-Size and Miniaturized Charpy Specimens. NIST Technical Note 1865.

-150 -100 -50 0 50 100 1500

100

200

300

400

500

X65

10 6.67 5

KV 10

est[J

]

Tadjusted [oC]

y 514 MPa

E. Lucon, C. N. McCowan, and R. L. Santoyo, (2015). Impact Characterization of Line Pipe Steels by Means of Standard,Sub-Size and Miniaturized Charpy Specimens. NIST Technical Note 1865.

-160 -140 -120 -100 -80 -60 -40 -20 0 20 400

100

200

300

400

500

X70

10 6.67 5

KV 10

est[J

]

Tadjusted [oC]

y 503 MPa

E. Lucon, C. N. McCowan, and R. L. Santoyo, (2015). Impact Characterization of Line Pipe Steels by Means of Standard,Sub-Size and Miniaturized Charpy Specimens. NIST Technical Note 1865.

-150 -100 -50 0 50 100 1500

50

100

150

200

250

300X100

10 6.67 5

KV 10

est[J

]

Tadjusted [oC]

y 817 MPa

Upper shelf behaviour

0 20 40 60 80 100 120

0.4

0.6

0.8

1.0

1.2 4340L 4340H T200 X52 X65 X70 X100

(KV B

x10)

/(KV 10

xB)

KV10/B [kN]

KV10 > 400 J

0 50 100 150 200 250 300 350 400 450 5000

50

100

150

200

250

300

350

400

2

U

ASTMVASTMVISOV MPa

JC12JCJC

U= 800 MPa

30°

r = 2 mm

ISO/DIN

30°

r = 2 mm

ISO/DIN

430° r=

8m

m

AS

TM 430° r=

8m

m

AS

TM

CV

[J]I

SO

CV [J] ASTM E23

U <450MPa

U=500-550MPa

U=600-700MPa

U>800MPa

U= 450 MPa

The ASTMhammer showfor hightoughnesshigher energiesthan the ISOhammer

Full size[J]

3/4[J]

2/3[J]

1/2[J]

1/3[J]

1/4[J]

10 7 7 5 3 214 10 9 7 5 316 12 11 8 5 418 13 12 9 6 420 15 13 10 7 522 16 15 11 7 527 20 18 13 9 734 25 23 17 11 841 31 27 20 14 1048 36 32 24 16 1254 40 36 27 18 1360 45 40 30 20 1468 51 45 34 22 1676 57 51 38 25 1886 65 57 43 27 19

100 75 66 49 31 20

Thickness Adjustment [°C]Full size 0

3/4 82/3 111/2 201/3 341/4 45

energy conversion

temperature adjustment

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