RTSS Videoextensometer - strain sensor for material testing

RTSS | Videoextensometer

Contactless Strain Sensor for Material testing

For standardised tensile tests

Easy specimen marking

Optional measurement of transversal strain

Strain from 0,0005% to 1000%

RTSS Videoextensometer for material tests and tensile tests

The RTSS Videoextensometer measures the longitudinal and transversal strain during material tests (e.g. tension, compression tests). The system can be used for flat and round specimen at field of view (FOV) of 10mm to 1000mm. For rope testing a FOV up to 5m can be realized. Strains from 0.0005% to 1000% can be measured.

The RTSS (Real Time Strain Sensor) can be intregated via different interfaces as a strains sensor and can be fully integrated in a tensile test machine. Further offline analysis modules for the determination of strain distributions and crack length (e.g. long term tests) are available.

Advantages of the RTSS Videoextensometers

Fast setup and easy specimen marking
Flexible field of view from a few mm to some m
Suited for all tensile test machines
Independant of the material

RTSS videoextensometer for longitudinal and transversal strain measurement during tensile tests

Simultaneous measurement of longitudinal and transversal strain.

Features

Contact less	No clamping =no mechanical influence of a mechanical sensor to the specimen: • High precision • No specimen influence/damage Measurement of the strain at failure (no mechanical limitation of the sensor)
Material independent	Wide application field on all materials Soft and rigid materials can be tested Strains from 5µm/m to 1000%
Flexible field of view	Specimen size of a few mm to some m For strains from 20µm/m until 1000% Used at small and large tensile test machines One system for • Different testing machines in one laboratory • Different tasks
Camera-based	Easy specimen marking (video) Can be used for tiny specimen due to enlarged image visualisation Recording of movies for documentation and quality control High precision, high speed Simultaneous measurement of longitudinal and transversal strain
Live-camera-view	Fast system setup Precise specimen alignment
Different data interfaces	Compatible to all tensile test machines Fully integrated with tensile test machines Analogue or digital data interface to test machine Usual data logging and determination of material properties (e.g. Young's module) by the tensile test software Automatic control through tensile test machine/software
Calibration	Easy system calibration with precise calibration plate Testing according to standards without mechanical sensor tracking

Technical Specifications

Product-Variants:

RTSS_Cx:

High resolution video extensometer for quasistatic tensile tests.
Measurement resolution for strain down to 5µstrains (=5µm/m)

RTSS_HS:

Fast video extensometer for dynamic tests.
The high measurement rate makes the system suited for dynamic applications (e.g. on a Hydropulser) and for the control of fast test.

Multi-camera-Systems:

Multi camera setups for:

Simultaneous measurement of different specimen sides.
Combination of a small and a large field of view → High precision measurement of E-modulus and measurement of the complete Force-Strain-curve.
Stereo Setup: Two cameras at a defined l0 distance measure. Each camera has a small field of view and measures one marker → Highest precision for rigid materials (small strains).

Specifications \ System	RTSS_C1	RTSS_C05	RTSS_C02	RTSS_HS
Precision class (ISO9513) at 100mm FOV*	1	0,5	0,2	1
Strain resolution	0.002%	0.001%	0.0005%	ca. 0,002%
Distance resolution at 100mm FOV*	1µm	0,5µm	0,2µm	1µm
Gauge length L0	10-1000mm	10-1000mm	10-1000mm	10-200mm
Measurement rate	up to 100Hz	up to100Hz	up to 100Hz	up to 1000Hz

*FOV=Field of View=image width. The FOV can be adjusted through different lenses.

We configure also individual systems for special applications.

Applications

The RTSS Videoextensometer is used as strain sensor

with universial tests machines for the measurement of
- Young's modulus ISO 527-1
- Poisson number ISO 527-1
- R/N values ISO 10113, ISO 10275
- Elongation at break

at fatigue tests
at vibration tests
Sheet testing ASTM E345, DIN 50154, ASTM E517, ASTM E646
rubber ISO 37
Composite materials ISO 527-4/-5
Foils ISO 527-3
Geo textiles, -grids ISO 10319
Polymers ISO 527
Metal and wire ISO 6892
Rope testing

To the list of scientific articles in which the RTSS system was used.

Software

Software

Functionality

RTSS

Flexibly configurably real time measurement software
Modern User interface

Short training time due to easy and intuitive user interface
Definition of templates allows quick switching for different test set ups

Multi-Core Support

Low CPU load
The RTSS software cab run simultaneously on the control computer of the test machine.

Istra4D

Optional post-processing software for

full field strain measurement
crack propagation and crack length measurement