gail lab final exam

What is ramp rate

Must be monitored and controlled throughout the cure process, too fast/too slow diminishes the exchange of volatiles out of the laminate and interrupts the movement of resin into low pressure sites

Pre preg

Composite materials in which a reinforcement fiber is pre impregnated with a thermoplastic or thermoset resin matrix in a certain ratio

Unidirectional fiber

Fibers go all in one direction, not woven, held together by small threads, not traces

Thermoplastics

Rely on heat to melt or allow the resin to in order to process, can be reheated and remolded

Thermoset

Two or more components that when mixed and properly cured form a solid, cannot be remolded

Routes of exposure

Absorption, inhalation, injection, ingestion

Absorption

Cuts or cracks, organic solvents, gloves, all on skin

Inhalation

Breathing a substance into lungs, different respirators have different rated filters

Injections

Introduces foreign matters into the blood stream or tissue

Ingestion

Swallowing chemicals, left on face, or ate through food

Respirable

Fibers whose shape and size allows for them to be potentially inhaled and penetrate deep into the lungs

Ceiling limit

Maximum allowable level for life, hard stop

Excursion limit

Can be exceeded by a specified amount of time (has to be below ceiling limit and TWA)

Threshold limit value

Degree of exposure to contamination which most people can work consistently for 8 hours a day, day after day, with no harmful effects

Resin mix ratio practice this (mix ratio 100:10) 340 gram batch

100+10=110

100/110=0.909

10/110=0.0909

340 *.91=309.4 resin weight

340*0.09=30.6 hardener weight

Etch and Aldine process

Uses scotch brite on the metal part, scuf up until you can’t see a reflection, clean the part in watch, then put in the etch bucket, then clean with water, then put in alodine, then remove and air dry the part.

what do we need high of to bond metal to metal

surface free energy

scheduling

the order of layers on composite make up

cure time

duration for a full cure to set

what is glass transition temperature

from rigid to more rubber flexible state

warp direction

longitudinal yarns in a roll of woven fabric, runs the length of the roll

fill direction

run 90 degrees to the warp yarns / across the roll of fabric

selvage

stitched or looped edge that runs along both sides and along the length of a roll of woven fabric.

warp clock

determines the orientation of fibers in a composite fabric layer

Co bonidng

two or more elements are cured together, with at least one element having been fully cured previously, and one being uncured

co curing

curing laminate simultaneously bonding it to some other uncured structure

secondary bonding

two or more pre cured or already cured composite parts join together by adhesive bonding

what is the schedule for a composite

vacuum port

bag film

other half of vacuum port

breather

caul plates

release film

peel ply

perforated film

cfrp panels

thermocouples

peel ply

solid release fil

sealant tape

caul plate

what type of fastener is good for composites

stainless steel and titanium

drilling for carbon and glass fiber reinforced composites

diamond coated carbide

drilling aramid fiber reinforced composites

brad point twist drill

inserts

potted inserts provide capability to attach components and sub assemblies to sandwich structures

bushing n drill guides

Clockwise (CW)

engineering point of view

Counter Clock Wise (CCW

manufacturing point of view

what does selvage precent

from fabric raveling

Nesting

yarn direction at the interface is the same for each ply at that interface

tracers

id the warp and fill direction, runs at 90 deg along the length