Sub-sized CVN specimen Uper shelf "Ductile" conversion - - PowerPoint PPT Presentation

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Sub-sized CVN specimen Uper shelf "Ductile" conversion - - PowerPoint PPT Presentation

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VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD Sub-sized CVN specimen Uper shelf "Ductile" conversion methodology C V [J] Transition region Lower shelf "Brittle" ASTM A01-13 meeting Tampa 2015 0 C] T [ Kim Wallin 1

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SLIDE 1

VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD

Sub-sized CVN specimen conversion methodology

ASTM A01-13 meeting Tampa 2015 Kim Wallin

Uper shelf "Ductile"

CV [J] T [

0C]

Lower shelf "Brittle" Transition region

1

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SLIDE 2

2 21/10/2015 2

ASTM A370 Table 9

Table 9 is based on a simple thickness-ratio correction.

10 20 30 40 50 60 5 10 15 20 25 30 35 40 45

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

KVB [J] KV10 [J]

ASTM A370 Table 9

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SLIDE 3

Subsized specimens

50 100 150 200 20 40 60 80 100 1/2 2/3 1/1

KV5x10 [J] KV10x10 [J]

A simple ratio-correction is not sufficient for the adjustment of sub-size Charpy-V specimen energies. Sub-size specimens yield higher absolute energies Sub-size specimens yield lower proportional energies

3

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SLIDE 4

4 21/10/2015 4

Effect of thickness on transition curve

  • 100
  • 50

50 100 150 20 40 60 80 100 120 140 1.25 2.5 5 10 15

KV/(Bb) [J/cm

2]

T [

  • C]

McNicol 1965

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

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SLIDE 5

Subsized specimens

Sub-size specimens yield lower transition temperature Included in BS7910-13 Included in BS7910-13

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

2 4 6 8 10 12

  • 100
  • 80
  • 60
  • 40
  • 20

20

95 % 5 %

THICKNESS CORRECTION FOR CVN TRANSITION TEMPERATURE

TCV28J = TCV35J/cm

2 - 51.4ln{2(B/10)

0.25-1}

T 5

0C

TCV35J/cm

2 - TCV28J [

  • C]

B [mm]

ASME UG-84.2 Towers

Similar to a statistical size effect related to cleavage initiation. See e.g. ASTM E1921.

5

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SLIDE 6

Subsized specimens

Sub-size specimens yield lower transition temperature Similar to a statistical size effect related to cleavage initiation. See e.g. ASTM E1921. Included in BS7910-13 Included in BS7910-13

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

2 4 6 8 10 12 14 16 18 20 22

  • 100
  • 80
  • 60
  • 40
  • 20

20

95 % 5 %

THICKNESS CORRECTION FOR CVN TRANSITION TEMPERATURE

TCV28J = TCV35J/cm

2 - 51.4ln{2(B/10)

0.25-1}

T 5

0C

TCV35J/cm

2 - TCV28J [

  • C]

B [mm]

ASME UG-84.2 Towers

6

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SLIDE 7

Subsized specimens

Sub-size specimens yield lower proportional upper shelf energies

50 100 150 200 250 300 350 50 100 150 200 250 300 350

CVB-US/(Bb) [J/cm

2]

CV10-US/0.8 [J/cm

2]

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 shear and some flat fracture. All shear fracture.

dcg s s s

Some shear and some flat fracture. All shear fracture. Some shear and some flat fracture. Some shear and some flat fracture. All shear fracture. All shear fracture.

dcg s s s

Due to a competition between shear and flat fracture.

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

7

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SLIDE 8

Subsized specimens

Sub-size specimens yield lower proportional upper shelf energies

20 40 60 80 100 120 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1

CV10-US/B [kN] (CVB-USx10)/(CV10-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.

8

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SLIDE 9

Subsized specimens

Sub-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 is insensitive to strength but sensitive to modulus

  • f elasticity .

Austenitic stainless slightly different than structural steel.

9

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SLIDE 10

Subsized specimens

Sub-size specimens yield lower proportional upper shelf energies

100 200 300 400 500 50 100 150 200 250 300 350

THICKNESS CORRECTION FOR UPPER SHELF

Mean predictions

KVB/(0.8xB) [J/cm

2]

KV10/0.8 [J/cm

2]

B = 7.5 mm B = 5 mm B = 3.3 mm B = 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.

10

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SLIDE 11

Temperature adjustment Energy conversion

11

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SLIDE 12
  • The conversion accounts for the lower energy required

to fracture shear lips.

  • CV10-US corresponds basically to a value without shear

lips.

  • For high CVN energies the measured full size specimen

energy becomes therefore less than indicated by the equation.

  • Begins to effect when CV10 > 100 J.

12

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SLIDE 13

100 200 300 50 100 150 200 KV3/4 KV2/3 KV1/2 KV1/3 KV1/4

KVB [J] KV10 [J]

Energy conversion

Estimated measured energy.

13

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SLIDE 14
  • 20

20 40 60 80 100 120 140 160 20 40 60 80 100 120 140 160 McNicol 1965 1.25 2.5 5 10 15

KV10est/(Bb) [J/cm

2]

Tadjusted [

  • C]

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

14

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SLIDE 15
  • 200
  • 100

100 200 300 400 5 10 15 20 25 30 35 40 45 50 10 7.5 5 2.5

KV10est [J] Tadjusted [

  • C]

4340 low toughness

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

y 1480 MPa

15

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SLIDE 16

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

  • 200
  • 150
  • 100
  • 50

50 100 20 40 60 80 100 120 140 4340 high toughness 10 7.5 5 2.5

KV10est [J] Tadjusted [

  • C]

y 952 MPa

16

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SLIDE 17

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

  • 200
  • 150
  • 100
  • 50

50 100 150 50 100 150 200 250 300 T200 10 7.5 5 2.5

KV10est [J] Tadjusted [

  • C]

y 1134 MPa

17

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SLIDE 18
  • 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

50 100 150 200 250 10 20 30 40 50 60 70 80 X52 10 6.67 5

KV10est [J] Tadjusted [

  • C]

y 325 MPa

18

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SLIDE 19
  • 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

50 100 150 100 200 300 400 500 X65 10 6.67 5

KV10est [J] Tadjusted [

  • C]

y 514 MPa

19

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SLIDE 20
  • 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

20 40 100 200 300 400 500 X70 10 6.67 5

KV10est [J] Tadjusted [

  • C]

y 503 MPa

20

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SLIDE 21
  • 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

50 100 150 50 100 150 200 250 300 X100 10 6.67 5

KV10est [J] Tadjusted [

  • C]

y 817 MPa

21

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SLIDE 22

Upper shelf behaviour

20 40 60 80 100 120 0.4 0.6 0.8 1.0 1.2

4340L 4340H T200 X52 X65 X70 X100

(KVBx10)/(KV10xB) KV10/B [kN]

KV10 > 400 J

22

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SLIDE 23

50 100 150 200 250 300 350 400 450 500 50 100 150 200 250 300 350 400

  • 2

U ASTM V ASTM V ISO V

MPa J C 12 J C J C

  • U

= 8 M P a

30° r = 2 mm

ISO/DIN

30° r = 2 mm

ISO/DIN

4 30° r = 8 mm

ASTM

4 30° r = 8 mm

ASTM

CV [J] ISO CV [J] ASTM E23

U <450MPa U=500-550MPa U=600-700MPa U>800MPa

U = 450 MPa

The ASTM hammer show for high toughness higher energies than the ISO hammer

23

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SLIDE 24

Full size [J] 3/ 4 [J] 2/ 3 [J] 1/ 2 [J] 1/ 3 [J] 1/ 4 [J] 10

7 7 5 3 2

14

10 9 7 5 3

16

12 11 8 5 4

18

13 12 9 6 4

20

15 13 10 7 5

22

16 15 11 7 5

27

20 18 13 9 7

34

25 23 17 11 8

41

31 27 20 14 10

48

36 32 24 16 12

54

40 36 27 18 13

60

45 40 30 20 14

68

51 45 34 22 16

76

57 51 38 25 18

86

65 57 43 27 19

100

75 66 49 31 20

Thickness Adjustment [°C] Full size 3/4 8 2/3 11 1/2 20 1/3 34 1/4 45

energy conversion temperature adjustment

24

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SLIDE 25

TECHNOLOGY FOR BUSINESS

25