Crack Paths 2012

[SEED

i

‘ i

1 " J.-.4,m

~ " fi a n 1.. Ill.

Figure 4. M a x i m upmrincipal (a, c) and VonMises (b, (1) stress field in presence of Cu

filling. (c) and ((1) stress distributions in a section of the Al sheet, parallel to the Cu/Al

interface. Insets highlight the dependence on the distance from the crack surface.

4 0

P0

3,5 . .‘

m a x i m upmrincipal stress

3.5 - "1,

VonMisestress

‘3 3.0 -

'

L? 3.0 -

._\

g 25 -

I

g 25 -

‘\

N

‘

‘\j

g 21) -

E 2.0 -

"\

E

I

a

g 1.5 -

‘Is 1.5 -

‘1

H 1 o _

'7

a t; 1.0 -

"

bi

I t ‘

0 5 _

7' I» .

I____-

0.5 -

'I—--|

0,0 .

|

l

|

A

1

o o I

,

|

l

I

i

0

20 40 50 so too 120

_

‘

o 20 40 ‘so

so 100 120

distance from the crack tip along the surface [pm]

distance from the crack ‘up along the surface [pm]

Figure 5. Theratios of the m a x i m ustmress in the absence (Gmaxzgog) and in the presence

(omaX2209_Cu) of crack filling. M a x i m upmrincipal stress (a); V o nMises stress (b).

Electrochemical Corrosion Measurements

The galvanic coupling between A1 and Cu gives rise to anodic polarisation of the former

metal, resulting in its preferential dissolution. A selection of electrochemical

measurements was performed, employing AA2099coupons as such and with E C DCu

layers (ca. 50 u mthick) covering half of the area exposed to the solution [1 1]. In order

to emphasise corrosive criticalities,

we performed corrosion testing in a strongly

607