Thermoelastic stress analysis system

Thermoelastic stress analysissystem（TSA）， Can be used for stress visualization analysis in material testing.

Stress measurement of metal and composite components on industrial sites

Thermoelastic stress analysis system（TSA is an imaging technology that can accurately measure the stress of an object under cyclic elastic loads.

The thermal elastic stress analysis uses an infrared imaging sensor equipped with an image processing algorithm to convert the temperature changes caused by thermal elasticity into surface stress images.

This technology has a long and successful application history in the field of aerospace testing, particularly in identifying and quantifying stress concentrations in metal and composite structures with complex geometric shapes and safety critical features.

Image of aluminum specimen with notch for thermoelastic stress response

Thermal elastic stress response image of pillar joint in compressed state

main advantages：

1）Measurement and processing during in-situ testing process

2）Optical full field measurement technology

3）Only a small amount (or even no need) of surface treatment is required

4）Easy to perform finite element modeling（FEM verification

5）Easy to operate: aiming and focusing、Then measure

6）Using an uncooled long wave infrared camera（LWIR）， It has a resolution sensitivity of less than 1mk

Under the action of torsional loadThermal elastic stress response image of 3D printed short-range wire truss

High fidelity imaging continuously optimized over time

Thermoelastic stress analysis system（TSA）， Especially in material testing applications, one of its key advantages is that the technology inherently has high thermal sensitivity, which depends on two key factors: the material properties of the object being tested and the time used for observation.

As a result of this,Thermoelastic stress analysis system（TSA can perform in-situ (semi real time) measurements on stress images with gradually improving quality. If the observation time is longer, the image noise can be reduced to a certain extent, and the visual quality of the stress image can be comparable to that of the finite element simulation image.

Thermal elastic stress response image of aluminum samples in three-point bending test

An aluminum sample is subjected to cyclic (fatigue) loads within the elastic range for testing；On the left is the finite element model, and on the right is the analysis using thermoelastic stress（TSA measurement results at different time intervals

An optical, aiming, shooting, and measuring experimental measurement technique

Thermoelastic stress analysis system（TSA is an optical non-contact measurement technology, which means it does not require a mechanical connection to the surface of the test object. Measurements can be taken on the entire optical visible surface to obtain full field measurement results. The MiTE software suite enables users to integrate stress and visual channel information for more comprehensive and detailed insights and analysis.

More importantly, users do not need to calibrate the sensor, and as long as the surface of the object is non reflective (with high emissivity), there is no need to preprocess the surface before detection. Just aim, shoot, and measure!

Thermal elastic stress response image of wrench under cyclic bending load

Fast and reliable finite element model validation

The thermoelastic effect produces surface temperature changes that are proportional to stress changes.

Visualizing the stress of elastic loaded objects enables rapid testing, refinement, and validation of finite element models.

This technology can be applied to structural features of almost any complexity, therefore, compared to other experimental measurement methods, model validation can be conducted in a more rigorous manner.

Pioneering thermal sensitivity, achieving<1mk

Thermoelastic stress analysis system（The innovative concept behind TSA stems from the application of a compact, robust, and "uncooled" long wave infrared camera (LWIR).

Combining *'s signal processing technology with customized timing electronic components，Thermoelastic stress analysis system（TSA can achieve groundbreaking thermal sensitivity of less than 1mK. By using relevant "phase-locked" techniques,Thermoelastic stress analysis systemTSA is capable of generating high signal-to-noise ratio (SNR) images.

By using relevant methodsThe "locking" technique enables ThermoESA to capture high signal-to-noise ratio (SNR) images as comprehensive measurements for finite element model (FEM) validation. This drives better design and engineering outcomes, as FEM can be improved and validated early in the design/manufacturing process.

andCompared to non cooled detectors, cooled detectors have higher sensitivity and excellent signal-to-noise ratio (SNR) characteristics at the beginning of cyclic measurements. However, its signal-to-noise ratio improvement speed is not as fast as that of "uncooled" detectors,This enables the Thermoelastic Stress Analysis System (TESA) to achieve good image quality.

Used for measuring two aluminum materialsThermoESA System for Stress Distribution on F-35 Incision

andThe ThermoESA system is packaged with the powerful MiTE Suite software package, which provides a comprehensive set of tools for advanced stress imaging and analysis.

MiTE Suite offers a range of features, including:

1）Complex thermoelastic response

2）Real time display of visible light and infrared images

3）Semi real time display of thermoelastic effect (user selectable frame rate)

4）plotting function

5）Point andROI indicator

6）Stress and temperature change calibration

Screenshot of MiTE software suite

A small and compact industrial tool, paired with powerful software

andThermoelastic stress analysis system（TSA is equipped with the powerful MiTE suite software package, which provides a comprehensive set of tools for advanced stress imaging and analysis.

This software has a series of functions, including: complete complex value thermoelastic response, real-time display of visual and infrared images, semi real time display of thermoelastic response (user selectable update rate), drawing function, points and regions of interest（RoI indicators, as well as calibration for stress, strain, and temperature changes.

The Thermoelastic Stress Analysis System (TSA) is a complete and well-equipped thermal elastic stress analysis system（TSA）， As a sensor equipped with cables, it provides quick and easy setup. All components (except for one laptop) are placed in a sturdy transport box to provide reliable protection during transportation.

Technical Specifications