Addendum to report 168

(1)

LABORATORIUM VOOR

SCH EEPSCONSTRUCTI

ÈS

TECHNISCHE HOGESCHOOL - DELFT

RAPPORT Nr.

SSL 168a

BETREFFENDE

ADDENDUM TO REPORT 168:

Low cycle fatigue of intersections of

bottom longitudinals of tankbarges.

(2)

SSL 168a

As a result of computer handling with measured values during

fracture experiments, plots of strain. (EPSILON) with respect to load (BELASTING) are available,.

6

In these plots EPSILON values are scaled up with a factor 10

to get convenient numbers.

A number of these plots is collected in this addendum to

report 168.

Figures 1 - 17 apply to-specimen A with interrupted brackets. Figures 18 - 25 apply to specimen B with through brackets. Specimen C has brackets of the same type as specimen B. Plots

of specimen C do not show new ixiformation compared with plots of specimen A and B.

The effect of buckling in the longitudinal bulkhead became clear but this is not surprising. So no plots of specimen C are

given.

The plots in figures 1 - 25 can help to find out in which places the structure behaves strongly non-linear during compression

and tension. It has to be remarked that non linearities in way

of a gange can also be caused by non-lineair behavior in other

points or partly fracturing elsewhere. The most important indication about cause and effects can be got from the loads at which the

effects start.

The plots of specimen A are, in this respect, very interesting as they clearly show that fracture has started in the lower part of the welds between brackets and bulkhead at a load of about 200 tf tensile. Total fracture occuned at 4O0 tf.

It is clearly shown that gauges 11 and 12 had maximum elongation

at 350 tf.; gauges 3H/41-1 at 375 tf tensile load; 7H/8H at 388 tf tensile load while 5H/6H show maximum elongations at the last moments..

(3)

C.)

i 25-00

-100.00

-75.00

-50.00

PUNT NO

M E E T P UN T

-5. ûü

-o. oo

EPS I L O N

Y'

15 5'O.

û O

/

Specimen type A Fracture experiment. Straingange 22 in the control section.

(21,26 and 27 have same characte

(4)

U

_rj

fl --J Uj r-)

-125.00

-100.00

-75.00

_--0.00

PUNT NO

IIL.LH t-d,

n

'--

-r: ç q L_I

.)

i L_L)t

FIG. SC 71-03-AD 2

05 ¿'5.00

50.00 M1j

Specimen type A Fracture experiment Straingange 17 in the control section.

(18,23 and 24 have same character)

(5)

- _5 3. Û O

PUNT NO

M _T

EDC i

L_I .J

Luk

-i5.iJU

> i U"

r't '-U U --15.00

4.00

Specimen type A. Fracture experiment Straingauge 25 in the vicinity ôf longitu-dinal break

has same character)

(6)

-r

-40.00

-3.0.Û0

-2U.Ü0

-10.00

J.

FIG. Sc 71-03-AD l. Specimen type A. Fracture experiment

Stràingauge 1 in the vicinity

of longitudinal break

(15 has same character)

I

L!NT NC

23

L)

_'IEETFUNT

7 D O T

10.00

20.00

130.00 E:FILL

0. 00

00. [.0

O..00

(7)

-110.00

-

_h

_0.00

FUNt NO

MEE TEUNT

4000

oh.

00 EF13 I LON

//

aø . '__J

13

Fi >,

1140.00

190..00

Specimen type A. Fracture experiment

Straingauge 16 in the vicinity

of longitudinal break

(8)

¿

LI

-125.00

-100.00

_{- /}

-'C-_{) - U}n

_-50.00

PUNT NO

MEETPUNt -.

FIG. SC 71-03-AD 6 Specimen type A. Fracture experiment Straingauge 3H in the

bracket of interrupted type

-

-'S,---

-Ffl H

bo. oc

i.?5. fli'

2 5. L'O -E i (J'

-. 00

0. 00

EPS I LCIN

7 . 00 30. 00

(9)

L) /f: / )

t

L)

-.rj

UD

r

r -r - r - _{. U}

X

s Specimen type A. Fracture experiment

PUNT ''

r. Straingauge 4H in the

MEETPUNT

bracket of iiterrupted type

r

î

3.UO

'.UO

::.i.O

_'-.JL

(10)

L.' L) D D D (--t D t-)

¡7

oc

2á0

_7h.00

PUNT NEI

9

MEETPUNT

₂

_R[3 13 --I I

120.00.

170.00 _220.00

EP5 i LJN

> 1 r FIG. SC 71-03-AD B

X

Specimen type A. Fracture experiment Straingauge 7H in the

(11)

/

-'i4.CO

PUNT N

12.

MEETPUNT

2 0 H

[3

r) O

:o

L:rJ.L0'

1u

3,.00

53LO

>

I

Specimen type A. Fracture experiment Straingauge. 8H in the

bracket òf interrupted type

C.)

.1/f

C -;

/

C.)

L,

(12)

C-) C')

/

EPCI! (I

L_

J

L.l'

'

FIG. Sc 71-03-AD 10 Specimen type A. Fracture experiment Straingauge 11 in the.

1.

123.00

150.00

175.00

. C:

PUNT N0

25 MEFTPUNT

₆

₀

__C' (1 L_J. L E)n '' L .Ji: nLL nL).

i

_25.00

_50.00

.1

_75.00

I

100.00

(13)

ç-j ç-j

-0150.00

-210.00

-'i31J. 00

_{-1 10.}

/L

PUNT. NO

V P E TP U N T

26 o

00

-1-30.00

.

-10.00

40.00 EP3ILL1N

x1U

r-fl J - U L.

ft:'

Specimen type A. Fracture experiment Straingauge 12 in th

bracket öf inter±'upted type

T

(14)

5.00

'k' 'f'

V

4.00

1.00

FIG. SC 71-03-AD 12

PUNTN

20 MEETPUNT

11 TO B

2L.00

34..Ü0

Li[

EP5iLN

10

Specimen type A. Fracture experiment Straingauge 5H in the

braket of interrupted type

(15)

L) Ci 1

-iCi.. 00

0. 00

10.00 oo.00

PUNT NO

M E E T P U N T

E P S I L ii N

FIG. SC 71-03-AD 13

'I

30.00

H Specimen type A. Fracture experiment Straingauge 6H in the

TO O H _{bracket of interrupted type}

1

. r

(16)

C) Li - 00

OF STRESS

1

/

IN

X

L[INGI TUO I NP.LS

MFIETPUNT

5 D 5 i i ---100. 00

_-7E.00

_{-f50. 00} _{-25. 00}

_-0.00

0. 170 0. 00

EPSILON

iO

FIG. Sc 71-03-AD 11+

V Specimen type A. Fracture experiment Straingauge i in the

19R _N _V

n::

I ._. _{Li L -} _Li _{Li _..} :_

75.00

bo. LO i.j. r7;

(17)

'--J

cJ

3/i 2/7'i

MODEL

T R T I C R L

_{MER5URENIENT DUPING FRRCTURE EXPEPIMENT,}

i

. 5G -.\c:...1 -

rn

L. U

(i'

L_I -

.

L...J

rfl

'-.r-.)u . UL)

2rr

Specimen type A. Fracture experiment Straingauge 2 in the

7L ..GO

PUNT NO

,lr

Nl E E T F' U N T 'J D O

(18)

C:) L) L. ¿ (-'-r

/

MF:

INT

5

FIG. SC 71-03-AD 16 Specimen type A. Fracture experiment Straingauge 9H in the

H. bracket of interrupted trpe

-?5.

oc

-.00

OS. 00

SIi. 00

75. LO

fl,fl Ií _{125. LO}

EPSILON

IO

-50. Oí)

- 5.00

- i Û O. O O

(19)

L.)

-

0O. 00

-7'5.Û0

-30.00

/

,/

J ."

_'r

/J

1/:

/.

//

PUNT NO

METPUNT

-25.00

-0.00

E P 3 1 L O N

Specimen type A. Fracture experiment i i Straingauge 10H in the

3 RD O H bracket of interrupted type

1:5 Ç'!fl

"-J . J_J U

X

(20)

L.L -J

-'i 00. 00

--J -i

PUNT NO

M E E T PU N T FIG. SC 71-03-AD-18 r.

10

0

o p

I 0

Iv,

Specimen type B. Fracture experiment Straingauge 26

(21, 22 and 27 same character) Control section.

50.00

.

75.00

100.02

-0. E! O

51 L O N

(21)

LJ

-7.00

- 5 0.00

PUNT NO

M E E T F U N T

-2.00

-L.00

E P

f L EJ N

/

V

Specimen type B. Fracture experiment Straingauge 17

(18, 23 and 2L

q _{same character)} u L L)

Viinity of longitudinal br&ak

25.00

(22)

C) U

-

72. 00

--62.00.

-E32.00

-42. 00

-32.. 00

r?

FIG. SC .71-O3-AD-20

00 iáÑ

jJL)

D Specimen type B. Fracture experiment Straingauge 46 (25,13,39,44L.9, 54 and 47 same character)

Vicinity of longitudinal break

-1? .00 00 'Thy

n-PUNT NO

3G

(23)

----OO.ÛO

-'1C.

DO

RUNT NO

22 MEE:TUNT

₆

-100.00

-O.00

E P 5.1 L 1i N

¡ Specimen type B. Fracture experiment Straingauge14 (15,LfO43,L8,L5,5o and 53 same character)

Vibinity of longitudinal break

:;b.00

bo.00

[j O

(24)

-J

i LjO O i: --iis.00

-o.co

FIG. SC 71-03-AD-22 _L4[

₀₀

-15.00

_1(LÜO

Efl3JL[')N

_>iU

nc

G U . O O u or: ri /1\ Specimen type B. Fracture experIment L.) Straingauge 16 (55 same character) C..)

L.)

RUNT NO

L3

Vicinity of longitudinal break

NIEL TPUNT

i :3 L..

r.)

:

(25)

r.

Ti

r;

e:) C C')

N1O[J.EL

B. FHPTUHE

_EX'

-tf5Lj.00

00 _-12t4.00

REH IMENT.

PUNT NO

ME ETEUN T

-104.00

--3L.Û0

E. P S

L [3 N Lfl5

-Specimen type B. Fracture experiment Straingauge 41

(51,42 and 52 same character) Vicinity of longitudinal break

-S4.. LO

), i ci

i

(26)

r,-, C-.: U FIG. SC 71-03-AD-214 U c;J '--J

Ti

1

I,)

PUNT NO

METPUNT .

3

i

FW E - H Specimen type B. Fracture experiment. Straingauge 3H in Bracket

(5H, 9H and II same character)

(group of fig. 25 same character)

-2.

r

_15.00

-i I

16Û0

.

2600

E F'

T LON

i

OU

(27)

-'LOO

/

j'

RUNT NO

MELTPUNT

i.

FO

_O H

i

) r

_(Ii'

(T

i LON

Specimen type B. Fracture experiment Straingauge '4H in bracket

(6H, 10H and 12 same character)