Joining and Testing Composite Plates to Ti Tubes

2005·0.64 MB·English

by  Morscher, Gregory N.

Jotning and Testing Composite Plates to TI Tubes
Gregory Ni Marscher, Rafiv Asthana, Mrityunfay Singh, and Tarah Shpargel

‘The joining of metal tubes to composite plates is required far heat-rejection
components In several space applications. Currently a number of different braze
‘campasitions are being avaluated 9 te their effectiveness. Such tube-plate
‘configurations cannat be represented by traditional methods of testing, 0.0, [ap
Jolnts. The jolned region is not between tw fat surfaces, BU rathar between 2 Flat
surface and a curved surface, Therefore, several tests have been employed to
ascertain the effectiveness of the different braze approsches in tension that are both
Simple and representative of the actual system and relatively straightforward in
analysis. The results of these "tube tesls* will be discussed for the three different
braze compositions, Cu-ABA, THCu-Sil, and Ti-Cu-Ni, In addition, fracture analysis of
the failed joints was performed and offars insights inta the cause of joint Fall and
the distinctions which necd to be made between the "strength" of a jolnt versus the
"load carrying ability" of a joint.
doining and Testing Composite
Plates to Ti Tubes

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Good Bonding Between Flat Plates of Braze
Compasitions to Ti and C-C Composites,
Objective

» To assess cifferaat braze composition
and iube-plate aiachment schemes
— How do you quantify losd carrying abtity
when joining tubes to plates?
> Bol are nat fal surfoas
+ Contact ‘area’ raay dlfiar capanding on joining
method, surface terion, wf

> Traditional approaches suck as lap

tests aren't useful 3 NEED FOR A
SIMPLE TEST

Tube Tensile Test
To measure the “tensite sivength" of the jaint

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Experimental: Processing
+ Tapes (13,7 ram disemaierjoinad to T-300 ©:
Gar Composites, 1) usieg three b
{Morgan Advanced Ceremes,

pilates (C-
raze compositions

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+ Specimens were mace with outer ply fibers urient
‘ithe parsiie: te lube direction of pependiculst te lube
direction

+ Some Civ states were grooved in order to increawe the
Soniact area of he

Experimental: Testing and Evaluation

be tensile tests were performed on an
tretron 4502
~ Siaelieaders (65 test, Eagie Claw, Denver, CO)
— Loading rake of Imaviain

~ The fracture surfaces wore analyzed opiically
fo deter e fovaticn of joint aire and
the area of contact between the tube and the
CC plate

+ Modifications were made hased on analysis
to improve load carrying ability
Tube Tensite Test

‘To measure the “tensile strength” of the joint

Pape

HL peatian of failed
jarebitucture etfects: g

TiCuSil Brazed Fracture Surface
(Perpendicular ic the tude axis)

rhe
TICUS? Brazed Fi
{Parallel to the tube axis) |

Tita

EFFECT OF BRAZE COMPOSITION
&
FIBER ORIENTATION
Load Carrying Ability of J
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Engineering Load per Plate Width

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[ Stress (bonded area) Carrying Ability
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Breze Composition and Fiber Orientation
Summary of Results
+ CU-ABA has highest load carrying ability !
|» Alractures acous within the C/G composite i
+ Composites with surface ply fibers orlonted
perpendicular te the tube axis were stronger
i than those with surface piy fihers oriented
parallel to the tube axis
+ The highest failure loads typically
eerresponded io the largest raclure areas
= TiGi-Ni had amall contact areas and the Pighest
‘elure skasses > Woontact ares could bs
ineressed, signtfcant oad cerrving abilty possible
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EFFECT OF PROCESSING LOAD
&
C/G PLATE GROOVED SURFACE
(attempts ° increase penetration and/or
bonded area}

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CiC Plate Surface Grooved with “Hand file”