Page 13 - Automotive Aerospace

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Joining parts together with adhesives offers advantages, including
improved fatigue resistance and stress distribution in the joint due to the
Upper grip
surface contact, over conventional bolted or welded joints. Research is still
being conducted into adhesives and adhesion methods.
Symmetric wedge sample
Two materials with different surface-treatment conditions (SS400 stainless
steel, with and without surface treatment) were stuck together with a
thermosetting-resin adhesive to form a symmetric wedge sample. Loads
Wedge
were applied to cleave the adhesive joint with a hardened steel wedge.
The maximum test force and deformation up to fracture differed according
to whether or not surface treatment had been performed. The adhesion Spacer
surfaces also appeared different after debonding.
Lower grip
Sample Mounted in Testerter
Sam ple Mo unt ed in Tes
With surface treatment
Without surface treatment
Test force (KN) ղ ૾ ౓ ෆ C Cohesive fracture e I Interfacial debonding g
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With surface
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Displacement (mm)
Test Force DisplacementCurvefrom Impact CleavageTesting Observations of Sample Surfaces after Debonding
Test Force – Displacement Curve from Impact Cleavage Testing
Testing of Aircraft Window Materials
Windows in the aircraft passenger cabin comprise a total of three layers of stretched or
non-stretched acrylic sheet and polycarbonate sheet. These are fastened with a sealant into the
window openings in the external skin. Even if one of the two outer sheets is lost, the remaining
sheet must be able to withstand the maximum pressure loads from the passenger cabin, air
forces, and external temperature.
Three- and four-point bending testing, ring bending testing, and compression testing are
generally used to evaluate the strength of window materials. Surface coatings are evaluated
using hardness testing and friction and wear testing.
Strength and Endurance Testing of Electronic Components
An aircraft is packed with various kinds of sensors and electronic equipment, including weather radar and
wireless communication devices. As such important equipment is directly related to the flight of the aircraft, it
must be durable enough to prevent defects over a long period of use. Surface-mounted electronic
components on circuit boards must be subjected to stringent testing under many hypothetical situations of
bonding forces, shear peeling forces, and stresses due to repeated thermal expansion and contraction cycles.
Endurance Testing of a Printed Circuit Board
Endurance Testing of a Printed Circuit Board
Testing and Evaluation Equipment
for the Aerospace Industry
Solutions for Aerospace Testing 13