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Digital Image Correlation Analysis of Strain Fields in Fibre-Reinforced Polymer-Matrix Composite under ±45° Off-Axis
1Faculty of Mechanical Engineering, Military University of Technology, gen. S. Kaliskiego 2, 00-908 Warsaw, Poland.
Polymers
|July 14, 2023
Summary
This study investigated in-plane shear in glass composites using digital image correlation (DIC). Uneven strain distribution was observed, impacting shear stress-strain curves and highlighting the need for advanced analysis in composite simulations.
Area of Science:
- Materials Science
- Composite Materials Engineering
- Experimental Mechanics
Background:
- In-plane shear properties (shear stress, modulus, strength) are critical for composite lamina materials.
- Previous research suggests loading rate influences composite strength.
- Accurate strain measurement is essential for understanding composite behavior under load.
Purpose of the Study:
- To experimentally investigate the in-plane shear behavior of a glass lamina composite.
- To utilize digital image correlation (DIC) for detailed strain distribution analysis.
- To quantify strain variations and their impact on shear stress-strain curves.
Main Methods:
- Performed ±45° off-axis tension tests on glass lamina composites.
- Employed digital image correlation (DIC) for non-contact strain measurement.
- Examined two cross-head displacement rates and validated DIC with strain gauges.
Main Results:
- DIC revealed uneven strain distribution resembling fabric texture, increasing with deformation.
- Quantitative analysis showed significant variations between extreme and average strain regions.
- Constructed shear stress-strain curves exhibited variations attributed to strain heterogeneity and microcracking.
Conclusions:
- Strain heterogeneity in glass composites can reach several percent, influencing numerical simulation accuracy.
- Strain gauge location significantly impacts experimental results, necessitating careful placement.
- Observed microcracking in the resin contributes to the nonlinear behavior of the shear stress-shear strain curve.
Keywords:
digital image correlation methodexperimental mechanicsfibre-reinforced polymer–matrix compositein-plane shear teststrain mapvinyl-ester resinMore Related Videos
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