Klopf Klopf
me when fasern verbinden
name 5 additive manufacturing processes
what is the core physical principle behind the adhesive bonding process
what are the 2 adhesive requirenments
teilchen benötigen bewegungsfreiheit um oberflächen benetzen zu können- müssen diese verlieren um kohäsive verbindung herzustellen —> energie muss irgendwo hin -> exotherme reaktion
daher basiert verbindungsgüte teils auf thermischer adsorption der bindepartner
Requirenments:
adhesive must have molecular mobility at some point during joining process
afterwards adhesive must build up cohesive strength = loose molecular mobility
what are the advantages / disadvantages for (laser-) stereolithographie SLA
aditiver herstellungsprozess
what are advantages / disadvantages of epoxy resin adhesive
name advantages / disadvantages of GLARE compared to monolithic aluminium 8
list advantages / disadvantages of polyurethane adhesive
what are advantages / disadvantages of selective laser sintering (SLS)
give 4 advantages of additive manufacturing
advantages and disadvantages of LECK DOCH MEINE EIER WIE VIELE VERFICKTE VOR UND NACHTEILE SOLL ICH NOCH KÖNNEN
list advantages of adhesive joining in aerospace structures - also klebeverbindungen
what are advantages of a Al-Mg-Sc alloy? 5
give advantages of fiber-reinforced plastics 10
give advantages of friction stir welding compared to other joining methodes FSW
why use sandwich structures, give 3 advantages
why is textile engeneering a important factor in fiber reinforced components, name 4 advantages of implementing it
whate are advantages of using dry fibre placement DFP in your process
give advantages: tailored fibre placement 5 when desinging parts
what are important aircraft fuselage design requirements 3
describe the process of anodizing aluminium, what is it used for and what different processes are threre
what are the benefits of welding over traditional joining(bolts and rivets) 3
cost reduction 25%
weight reduction 10%
improved corrosion resistance
describe the braiding process and give advantages and disadvantages for using it for part production
how are polymers classified, name the 4 categories and the main factor that sets them apart
main difference: interlinking of polymer chains
Vitrimeer, irgendwas zwischen duroplast und thermoplast, kein plan diggi
describe the claddig manufacturing process
where would i use this, what are the advantages
additive manufacturing
used for: Production of Large Structural Components, Complex geometries , Repair and Refurbishment…
name 3 categories of cleaning products for preparing surfaces for adhesive joints
when would you use wich one
how woud you test coating thickness for different coating types?
eddy current testing for no-metal layers on non ferrous metals paints on aluminium
magneto inductive testing dor metal coatings on ferrous metals chrome on steel
beschreibe die 2 methoden des compression moulding,
welche vor und Nachteile hat der einsatz von compression moulding
what core materials for sandwich structures can be used? (3)
when would you use each one?
honeycombs
rigid foams
wood
!AI Slop:!
what is galvanic corrosion, how does it work
Bonus:
what does this mean for desinging parts
entweder kontakt zwischen unterschiedlich noblen metallen vermeiden oder korrosion durch isolation/trennung/beschichtung vermeiden
what is intergranular corrosion, how does it work
AI slop:
describe pit corrosion, how does it work
—> vermeiden durch beschichtungen und korrosions schutz?
welche Vorteile bietet das friction stir welding?
what is aditive manufactoring?
a process where a body is created by adding material
lol
how do adhesive bonds age, what factors play a role and how does this affect the bond
what is angle-ply-laminate and why would you use it
gleiche Anzahl von laminae gleicher dicke alternierend hintereinander
—> geringere kopplung zwischen den achsen z.b. torsion-biegung
definition: filament-volume φ
definition: fillers in adhesives
used to tune properties of polymer adhesives for specific applicationsoptical appearance, electrical / thermal conductivity, hardness, crack spread
definition: lamina
mostly unidirectional (UD) layer
typical thickness t = 0,125 mm
definition: laminate
combination of multiple lamina with diffrent fibre orientations
→ lamina orientation influences mechanical properties
definition: monofilament
single fiber
base element of fibre-reinforcement
short, long or continuous diameter
D = 7...150 μm
was heißt es wenn ein laminat quasi isentrop ist?
mechanische eigenschaften in alle richtungen quasi gleich
was bezeichnet man als rowing/tow?
a bunch of loose, non-twisted filaments (CF/GF) or multifilament-yarn (NF)
definition: sizing
chemical coating on yarn to protect fibres, improve processing, improve connection between matrix and fibre (load transfer)
was beschreibt die surface preparation bezüglich adhesive bonding
removal of contamination / loose adhesive surface coveringactivating surface by increasing number of bonding partners with adhesive = cleaning
→ optimizing adhesion forces without negatively affecting material properties
was ist das ziel des surface pre-treatment (als teil der surface preparation)
nenne 4 beispiel Methoden
raises surface energy and creates micro-roughness for better wetting, adsorbtion of adhesive
sanding, blasting, vacuum UV radiation, anodsation
was versteht man unter symmetrical laminate
material symmetry around center plane
[0, +45, 90, -45]S
wtf is yarn
combination of monofilaments processing to textile semi-finished products
spun yarn = short, hairy, twisted fibres
multifilament-yarn = long, little twisted fibres
what are common disadvantages of aditive manufactoring, how does this influence how it is used?
high material cost
unsuitable for large quantities / mass production
anisotropic material properties
— mainly used for small, specific productions, prototyping, spare parts manufactoring etc.
name some disadvantages for adhesive joining
low peel strength
aging behaviour
low temperature resistance
complicated surface treatments
no possibility for non-destructive testing
difficult to disassamble
difficult/impossible to inspect (not possible/ very hard to see crack growth)
disadvantages of fibre-reinforced plastics 5
low bearing stress
partly low damage tolerance (2D-composites)
high material cost (carbon fibres)
partly costly manufacturing (prepreg)
partly long cycle times (autoclave)
partly low chemical resistance
disadvantages of friction stir welding FSW
high tool downward forces required → big / rigid welding machines
pin hole at the end of welding seam
complex tool handling for 3D applications
disadvantages of sandwich structures 8
more space required
joining / force introduction more difficult
higher fabrication cost
difficult complex shaping
complex non-destructive testing
complex repair- moisture absorbtion inner core
pressure equalization space flight
effects of scandium on aluminium alloys 4
finer grain
strenghthening
improves weldability
higher anti-recrystallisation effect = development of new grain inside existing one → decrese in dislocations → reduction in strength
electrochemical corrosion process
fasteners inspection methods
visual inspection
eddy-current inspection Wirbelstromprüfung
fibre placement technologies
friction stir welding FSW process
groups of fasteners 2
hand lay up with dry fibres 10
macro flow 4
metallurgical effects of scandium + zirkonium on aluminium alloys 3
higher anti-recrystallisation effect = development of new grain inside existing one
→ decrese in dislocations → reduction in strenght
methods for facesheet-core bonding 5
micro flow 2
multiaxial non crimp fabric 5
preforming manufacturing processes Grafik
prepreg autoclave process 8
prepreg manufacturing process Grafik
prevention of corrosion
principles of corrosion protection: barrier protection
passive corrosion prevention
coatings
surface treatments
sealents
principles of corrosion protection: corrosion prevention by design
principles of corrosion protection: electrochemical protection
principles of corrosion protection: influencing corrosion media
principles of end-of-life recycling of composit materials 4
properties of fold cores 6
properties of rigid foam cores 6
properties of wood cores 6
Properties: ABS 8
Properties: Aluminium 8
Properties: Aramindfibre 8
Properties: Carbonfibre 8
Properties: Glassfibre 8
Properties: Magnesium 8
Properties: Nickel 8
Properties: PA 8
Properties: PEEK 8
Properties: PLA 8
Properties: Sisalfibre 8
Properties: Steel 8
Properties: Titanium 8
pultrusion 8+Grafik
repetition: stress-strain diagram 4+Grafik
resin process principles for thermosets
infusion → negative pressure VARI, VAP, SCRIMP
injection → positive pressure RTM, VaRTM, lightRTM
resin transfer moulding RTM 10+Grafik
Seeman Composite Resin Infusion Molding Process SCRIMP 4+Grafik
surface pre-treatment: blasting
surface pre-treatment: grit blasting of CFRP
surface pre-treatment: milling
surface pre-treatment: sanding
surface treatment steps
surface preperation cleaning, bathing
surface pre-treatment sanding, blasting, anodisation
surface post-treatment air conditioning, primers
tailored fibre placement embroidery 5
TowPreg winding 5+Grafik
types of chemically hardening adhesives 2
two component adhesives: sponaneous reaction after mixing
one componentent adhesive: reaction under certain conditions temperature, moisture, humidity
types of corrosion
vacuum assisted process VAP 5+Grafik
winding 6+Grafik
working principle: adhesive joining
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