3D Metrology
OPTICAL TESTING OF
MATERIALS & STRUCTURES
Digital image correlation can be used for strain,
3D deformation and displacement analysis
// JOHN TYSON II, QIUTING ZHONG
Developing and producing a modern
aircraft is an extremely complex
process. Understanding the materials
properties and structure behavior
throughout the design and manufacturing
workflow brings about improved product
quality, reduced costs and time.
GOM’s optical 3D ARAMIS system has
been used in aerospace testing and
manufacturing for years and is now
replacing traditional measuring devices,
such as strain gages and displacement
sensors (LVDTs), in achieving precise
materials properties, complex structural
response and high-precision finite element
models (FEM).
ARAMIS DDIC AND
THERMOGRAPHY
One advanced application example
includes the ARAMIS system with
integrated thermal cameras for thermalycorrected
strain measurements of the
aircraft aft deck while the jet engine
thrusts to full power, all performed from a
15m boom. The full-field 3D coordinates
(deformations and strains) and
temperature results are combined in the
ARAMIS Professional software, so that a
temperature value is assigned to each 3D
SHOWCASE \\ AEROSPACETESTINGINTERNATIONAL.160 COM
1 // Combination of the
ARAMIS (3D-Digital Image
Correlation) measuring data
with temperature data in the
GOM software
2 // Ground vibration study
comparison with 50
accelerometers, ARAMIS took
2 hours to be set up versus
2weeks. Data matched
perfectly
2
1
coordinate. These thermal measurements are used to
correct thermal expansion of the strains, providing the
true mechanical strains under complex thermal
conditions. Material measurements of 3D deformation
and strain in the blast of a jet engine thrust can only be
described as nearly impossible measurements in a
hazardous environment but are easily achieved with the
ARAMIS system.
VIBRATION AND SHOCK TESTING
Vibration studies using high-speed cameras with 3D
dynamic photogrammetry capture the 3D vibrations like
hundreds of 3D accelerometers. For real world testing, the
ARAMIS photogrammetry system can measure the 3D
vibrational response of complex systems, such as engines,