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HYTEC,
Inc. has developed measurement techn ology that dramatically improves the ability to make
quick, accurate residual stress measurements. We utilize
the stress-relaxation technique where a small hole is drilled
into the material thus relaxing the stress along the hole
boundaries. The resulting deformation can then be measured
precisely using our electronic speckle pattern interferometry
system. The deformations are used to calculate the in-plane
stress components. Accuracy of this technique has been demonstrated
in a variety of metallic materials.
Our
system is optimized for industrial users to allow ease of
use and a low cost operation. Other competing residual stress
measurement techniques have not assembled all the interfaces
for quickly measuring residual stress in a component. PRISM
is a fully integrated system that includes a computer controlled
drilling system, an automated data acquisition system for
acquiring deformation maps, and a software package that
processes the deformation data and visualizes the stress
results.
PRISM
dramatically increases the speed of data acquisition over
the traditional strain gage hole-drilling technique of measuring
residual stress. The strain gage technique requires application
of the gage, soldering of the leads and readout of the strains,
followed by analysis of the strains to get residual stress.
This process can take between 1 and 4 hours to complete.
With PRISM, the strain gage is eliminated, and the entire
drilling, data acquisition, and stress analysis functions
are integrated in a single system. With a PRISM system,
users can perform the entire operation and have stress results
in less than 5 minutes.
PRISM
also overcomes many of the challenges that are faced by
users of XRD systems. Application of XRD for quality control
is extremely specific to a material, component geometry,
and type of diffraction analysis. PRISM only requires that
you know the material elastic modulus, and is suitable for
measurements in non-metallic parts.
PRISM
systems are available in a variety of configurations, from
laboratory bench-top systems to portable systems. By adding
software modules, the basic residual stress system can also
be used to measure small deformations (20 nm and up) and
to locate resonant frequencies and mode shapes in parts.
Contact HYTEC to discuss your particular application.
Key
Benefits:
- Fast: typical measurement
and analysis in less than 5 minutes
- High-resolution: monitor
stress changes much less than 1,000 psi
- Customizable: affordable
solution designed specifically for your application
- Accurate: more data with
full field of view, real-time surface measurements
- Non-contact: only requires
direct visual path to part
- User friendly: Windows
based software
Related
Links
NPL UK: Residual Stress
Round Robin results, and lots of good links to researchers
and practiotioners in the UK.
Mike Prime (developer of the contour method) maintains
this site of upcoming residual stress events.
Gary
Schajer, professor of mechanical engineering at University
of British Columbia, maintains an active residual stress
research program, and is collaborating with HYTEC on ESPI
hole drilling.
Link to a recent residual
stress summit, held in Los Alamos, NM, December 10 and
11, 2003.
More
Information:
 The following papers on PRISM
Residual Stress measurements were presented at conferences,
by HYTEC personnel or PRISM users:
- "Data Reduction Methods
for Digital Holographic Residual Stress Measurement"
Presented at the Society for Experimental Mechanics Annual
Meeting, Portland, OR June 2001 PDF
0.5 MB
- "Verification of
a Technique for Holographic Residual Stress Measurement"
Presented at the American Society of Mechanical Engineers
Pressure Vessels and Piping Conference, Atlanta, GA, July
2001. PDF 0.3 MB
- "Effect of Hole Drilling
Parameters on the Accuracy of Residual Stress Measurements
for ESPI Hole Drilling" Presented at the British
Society for Strain Measurement, Stratford Upon Avon, UK,
August 2002 PDF 0.2 MB
- "Residual Stress
Measurement using the hole drilling method and laser speckle
interferometry, Parts I-IV”, Published in Experimental
Techniques, 2003, Vol 27, Issues 3,4,5,&6. Part I,
Part II, Part III, Part IV
- “Known
Stress Field for Hole Drilling Accuracy Evaluation”
Presented by Wayne Kroenke at the SEM International Congress,
Costa Mesa, CA June 2004. PDF 0.2 MB
- “Full-Field
Calculation of Hole-Drilling Residual Stresses from ESPI
Data”, Presented by Gary Schajer at the SEM International
Conference, Costa Mesa, CA June 2004. PDF
0.9MB
- “Measuring
RS in Steel Plate Using a Laser Holographic System”,
Presented by Norma Jean Mattei at the SEM International
Conference, Costa Mesa, CA June 2004. PDF
0.7MB
Sales
Information:
505-661-3000
sales@hytecinc.com
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