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High-Speed Tensile Testing
Localized Strain Evaluation Using High-Speed DIC
Uniaxial tensile testing is the most widely used material testing method in practice. During a tensile test, an axial force is applied to a sample until failure to derive crucial mechanical properties such as strength, elasticity, and ductility. Analyzing load-to-displacement data allows engineers to generate stress-strain graphs, providing key design parameters like yield strength, ultimate tensile strength (UTS), and Young’s modulus.
This case study was conducted in collaboration with our Austrian partner, 4A engineering. The strain data computed by Mercury RT serves as a vital input for generating validated material cards.
Objective
The primary objective of this study was to evaluate and quantify the localized strain on a standardized specimen subjected to high-speed deformation under dynamic loading conditions.
Description of the Case Study
Description of the Case Study
❖ Testing Machine: 4A engineering’s Linovis dynamic testing machine, capable of reaching testing speeds up to 3.2 m/s, a maximum force of 25 kN, and a maximum stroke of 200 mm.
❖ Optical Setup: A 2D Digital Image Correlation (DIC) system utilizing a Photron Nova S9 high-speed camera paired with a high-fidelity Zeiss 100 mm lens.
❖ Image Acquisition: The camera captured the event at a resolution of 896 x 240 px with an ultra-high frame rate of 40,000 fps.
❖ Testing Speed: This specific configuration allowed the system to precisely record localized strain at a testing speed of 2 m/s.
Results
The Mercury RT DIC software successfully processed the high-speed imagery, delivering comprehensive insights into the material behavior:
❖ Full-Field Strain Mapping: Provided clear graphical visualizations along with precise quantitative data mapping the material’s structural response to rapid, dynamic loading.
❖ Multi-Point Tracking: Handled virtual extensometers to track elongation between two points at multiple critical locations across the sample surface.
❖ Simulation Material Cards: The computed high-fidelity strain data was imported into Valimat (4A engineering’s proprietary software) to generate fully validated material cards for finite element analysis (FEA).
Advantages of Using 2D DIC in High-Speed Testing
❖ Precision under Extreme Conditions: Accurately evaluates strain distribution even under rapid, volatile deformation rates.
❖ Full-Field vs. Single Point: Unlike traditional mechanical extensometers, DIC captures full-field strain gradients, revealing localized deformation and necking behavior.
❖ High-Speed Capability: Perfectly suited for capturing extreme dynamic events, allowing for precise tracking and measurement at ultra-high frame rates (such as 40,000 fps).
❖ Non-Contact Measurement: Eliminates the risk of knife-edge slippage or physical sensor damage during violent high-speed material failures.
❖ Seamless Workflow Integration: Directly bridges the gap between physical impact testing and digital material simulation.
For more information about high speed 2D DIC, please Contact us through email info@mercury-dic.com.
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