ReSA System
The ReSA (Residual Stress Analysis) system combines the established ASTM E837 hole drilling method with optical full-field measurements based on Digital Image Correlation (DIC). This is especially suitable for composite material, where conventional strain gauge-based methods may be limited.
The ReSA system is a portable 3D-DIC system for residual strain analysis. Instead of measuring strain locally with bonded strain gauges, ReSA captures the surface displacement field around the drilled hole using high-resolution stereo cameras. These displacement fields are subsequently evaluated to determine residual stresses.
To accommodate the drilling process, the system utilizes a stereo camera arrangement with angles of up to 40°, allowing a high-speed, speed-controlled drilling unit to be positioned centrally between the cameras. The ReSA system includes a micro linear stage for the drilling unit and an additional stage for the Blue-Falcon stereo system and Blue-X-Focus light source, enabling precise adjustment of drilling depth and optical focus. Motorized, computer-controlled stages are available as an option.
ReSA system advantages against strain gauge based methods
ReSA System
- No corresponding errors:
- Exact drilling position is not required
- The material matrix directions can be arbitrary
- Technical advantages:
- Full field, high spatial resolution even close to the hole
- therefore suitable for inhomogenous materials
- Economical advantages:
- Low operation cost per measurement
- Fast and simple preparation of object surface
Strain Gauge & hole drilling
- Measurement errors due to
- misalignment of the drilled hole to the centre of the gauge rosette
- individual strain gauge application relative to the matrix direction
- Technical considerations:
- Single point strain value and averaging across gauge area, therefore not representative for inhomogeneous material
- Economical aspects:
- High cost per measurement due to strain gauge
- Preparation time for applying the strain gauge
Blue-Falcon Cameras
The modular design allows for flexible system expansion, enabling the cameras to be integrated into various system configurations and used across a wide range of applications.
Other DIC Products
3D-Micro-DIC
Blue-Hawk-System
High-Speed
IR-Systems
Multisystems
ReSA System
VIC-2D Systems
VIC-3D Professional Systems
VIC-EDU System
VIC-Stereo-Microscope
VIC-Vibration Analysis
Product inquiry
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