Material testing CTOD.tests on: Local pipe specimens, material: API.5L.X60

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SSL 331

1REPORTN33L

DATE iS JANUARY 199T

PROJECT SC 9002

y

D.TESTS ON:

local pipe speçimens

miterial: APL5L.X6O

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1. Introductiòn.

2 Material and specimens

3 recracking and bend tests

4. Results,.

5 Tables and graphs

a Data and results base material b Data and results weld material

e Data and results fusion line 6. Calthration dataof M'1S. clip gauge.

page 2 3-5 6-8: 9-Il

l.

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INTRODUCTION

This report gives CTOD-values for three sets of two specimens

tested at -10°C in accordance with BS 5762:1979.

The tests have been carried out on requést of the Apparaten- en

Ketelfabriek AKF BV in Goes. The tests concern:

pipe bend: OD: 773.8 mm;

WT: 29.5 mm;

radius: 2286 mm;

material: API 5L X.60; heat no.: 532718.

MATERIAL AND SPECIMENS

Three sets of two specimens have been tested.

All sets include 2 specimens.

First set: base material (specimens 317.6 - 317.16).

Second set: weld material (specimens 317.26 - 317.34).

Third set: heat affected zone (specimens 317.27 - 317.35).

According to BS 4515:1984 the tests shall be carried out on

specimens with the preferred geometry (V - 2B) of BS 5762:1979.

In practice the considered specimens showed a misalignment of the neutral axis in the bend test fixtures due to the fact of the

radius of the pipe diameter. In this case the misalignment was

over 12 nun (see fig. I). Therefore, by agreement between AKF

(Mr. v.d. Velden) and S.S.L. (Mr. Vonk) it was decided to use the

subsidiary test piece geometry W = B.

Furthermore it was decided to reduce the thickness with 3 mm by planing on both sides of the specimens (see fig. I).

The yield stress is assumed to be: base material: Uy = 413 N/mm2;

weld metal : Uy = 440 N/mm2.

The initiating notches have all been provided with integral type knife edges. The distance between the knife edges has been 6 mm.

i Figure I. 3 mm planed DELET UNI

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The N:'rIands

-____

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3. PRECRACKINC AND REND TESTS

Precracking and bend tests-have been carried out in 3-point bnding, iÎi accordance to BS. 5762: 1979.

A loo kN load-'controlled servo hydraulic testing machine has been used for the realisation of the fatigue precracking under constant amplitude loading at room temperature

The CTOD-tests have been carried out in a 350 kN load-controlled servo-hydraulic testing machine with a cryogene box

Cooling and stabilisation on the test temperature is obtained by accurately controlled liquid nitrogen injection through a solinoid valve Via a ducting system the nitrogen is distributed

homogeneously in the cryogene box, without influencing the measuring devices

The temperature is measured using thermocouples in contact with the test piece surface at the crack tip location in front and at the back side of.,the test piece.

-The test temperature for all specimens has been -10°C The tests were started at a temperature of about 1°C below the test

temperature Depending on the amount of plastic deformation the measured temperatures rose to a value between -10°C and -9.5°C at the moment of failure,.

The CODs have been measured with MTS clip gauge1 type

632 020-20, serial no 675 The calibration values over ranges of 0;5. and 2.6mm.áre -glveii in the tables and graphs on pagé; 12

4 RESULTS

-228

The 2 DELFT. etiandè

The results are presented in the tables and graphs on page 3 up to

11 i

All tests are valid according to BS 5762 1979

DELFT UNIVERSITY 0F TECHNOLOGY

Departm _{t of Mechanical Engineering and Marine TechnoIogy} ru ures Laboratory

- i _Laboratory

DEIFT UNIV 'lily

F TE 00V

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Fatigué 'cracking 'daté

Testing machine (kM)"

Test temperature (°C)

Span

(mm)

Loàding

(kN)

R,

(stress ratio)

1f

(Nnun-3/2)

Number of cycles (*lO#3)

(mm)-al

(mm) L(flUfl)--a3: .', ' '

a average' ./ W".

.COD-test: data'Y'

Vc

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DELFT UNIVERSITY _{OF TECHNOLOGY} _SHIP _{STRUCTURES LABORATORY}

FRACTURE MECHANICS TEST

_{r(CTOD2test) cf}

_BS-5762/1979

PROJECT 'SC -90'02, " ' _''

:Dte'

15O. 1991

CLIENT APARATEN - EN KETELFABRIEK AKF BV - GOES

Spócimeñ data'

'Specimen ñr.

W-('hi'ght)

r

B ('tI:tickness)

Vu Vmax

Pi

Pc,

Pù

Pmax

317 .1

26.4

100 20'

,1I08L -1183

16 17

8.5

3f. : 2O f2 28'

i3,.rL2.

8.9 3 point bend'

Testing machine (kN)

_,350

Test temperature (°C)

_-10

_-IO

Span

(mm) _{_108} ₁₀₈

dK/dt

' - -

(Nrnni-3/2 s-l)

-

55.O,

'

Yield strengtl used4n ca1culatons

₄₁₃

N/mm2

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- 6

DELF UNIVERSITY OF TECHNOLOGY SHIP STRUCTURES LABORATORY

COD-test data _{3 point bending}

Testing machine (kM) Test temperature (°C) Span (mm) dK/dt (Nmm-3/2 s-l) _56.7 _56.8 Vi (mm) Vc (mm)

Vu

(mm) Vmax (mm) _0.881 _1.480 Pi (kN) Pc (kN) Q' Pu (kN) Pmax (kN) _77. _71.5 Calculated results CTODi (nuis) CTODc (nun) CTODu (mm) CTODmax (mm) _0.441 _0.678

Yield strength used in calculations: ₄₄₀ _N/mm2

REMARKS _valid _valid

FRACTURE MECHANICS TEST (CTOD-test)

PROJECT SC 90 02

CLIENT: _{APPARATEN- EN KETELFABRIEK AKF}

cf. BS-5762/1979 Date: 15.01.1991 BV - GOES Specimen data Specimen nr. 317.26 317.34 W (height) (mis) _27.0 _27.1 B (thickness) (mm) _27.0 _27.3

Fatigue precracking data 3 point bending

Testing machine (kN) lOO 100

Test temperature (°C) 20 20

Span (mm) 108 108

Loading (kN) _24.0 _24.0

R (stress ratio)

_0.1

Kf (Nmm-3/2) 1223 1207

Number of cycles (*10A3) 20.23 15.53

aO (mm) _9.I _9.1 a4 (mm) _9.3 _8.8 al (mm) 9.8 9.9 a2 (mm) _9.8 _10.0 a3 (mm) _9.8 _9.6 a average / W _0.36 _0.36 350 350 -10 -10 108 108

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DELfl UNIVERSITY OF TECHNOLOGY SHIP STRUCTURES LABORATORY FRACTURE MECHANICS TEST (CTOD-test) cf. BS-5762/1979

PROJECT SC 90 02 Date: 15.01.1991

CLIENT: _{APPARATEN- EN KETELFABRIEK AKF BV - GOES}

COD-test data _{3 point bending}

Testing machine (kN) Test temperature (°C) Span (mm) dK/dt (Nmm-3/2 s-l) 60.1 58.5 Vi (mm) Vc (mm)

Vu

(mm) Vmax (mm) Pi (kN). Pc (kN) Pu (kN) Pmax - (kN) calculated results CTODI. (mm) CTODc (mm) CTODu (mm) CTODmax (mm)

Yield strength used in calculations: ₄₄₀ _N/mm2

Specimen data

317.27 317.35 Specimen nr.

W (height) (mm)

B (thickness) (mm)

Fatigue precracking data

27.1 27.0 27.0 27.3 3 point bending Testing machine (kN) ₁₀₀ ₁₀₀ Test temperature (°C) ₂₀ ₂₀ Span (mm) ₁₀₈ ₁₀₈ Loading (kN) _24.0 _24.0

R (stress ratio) _o.i _0.1

Kf (Nmin-3/2) 1311 1247

Number of.cycles (*lO'3) 20.21 19.06

aO (mm) _9.8 _9.5 a4 (mm) _9.6 _9.4 al (mm) 10.8 10.1 a2 (mm) 10.8 10.1 a3 (mm) _10.1 _10.2 a average / W _0.39 _0.38 350 350 -10 -10 108 108

EMARKS valid valid

j .761

72.R

0.778 0.389 61.0 0. 204

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Clibrat-ion of MTS -clip gauge 2. 5:mm

Clip gaugé trpe: MTS632-02C-2

Serial nümber: 675

Measuring range 2 5 mm

Gauge conditioner Peekel MCA100 in 5000

Calibration device LSC microspan

Clock gauges O - 0 5 nun with 0 001 inni accuracy

O - 2 5 mm with 0 01 nuit accuracy

-S-' -- r

-

-The clip gauge/conditioner combination has been calibrated on the 21 th of January -

-.1991 . . r . ., - -

-The results are:

12

rnicröV/V range

DELFTUNIVE'4r

HNOLO6Y

-Ship St

.Lab'ratory.

o -. 0 5. mm 1 916 Volts per mm inaccuracy O 006 mm, 0 15% of f s r