PSI - Issue 66

Sneha et al. / Procedia Structural Integrity 66 (2024) 419–425

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Sneha, S.Ray/ Structural Integrity Procedia 00 (2025) 000–000

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Figure 1. Cube testing

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2.3. Test Method The 5000 kN controls test machine has been for compressive testing as shown in Figure 1. For evaluating the fracture properties, a 500 kN fatigue test machine has been used with a three-point setup. The experiments have been performed under the crack mouth opening displacement (CMOD) control manner at a loading rate of 0.003 mm/sec for all three sets. Additionally, digital image correlation (DIC) techniques have been utilized to accurately track the variation in crack length across different fibre combinations, providing precise measurements of crack propagation during the tests. The test setup is shown in Figure 2.

Figure 2. Setup and tested specimen of hybrid combination

2.4. Digital image correlation: Digital Image Correlation (DIC) is a widely used nondestructive technique for measuring surface deformation in materials by analyzing images captured under various loading conditions [11]. It captures high-resolution images at the surface of specimens before and during loading, allowing to track movement and strain in real time. DIC has proven valuable for studying crack propagation, crack length and crack width in composite materials. The 2D DIC software LAVISION has been used in this study. The area of interest for DIC analysis has been chosen as 150 mm ×120 mm with random special patterns. The DIC analysis has been carried out on pre-MOR and post-MOR points for analyzing the variation of crack length at different loading. Points A, B, C, D, E, and F are the representation of the limit of proportionality (LOP), 90 % of pre-modulus of rapture point, MOR point, 80 % of post-MOR point, 50 % of post-MOR point, and 30 % of post-MOR point respectively.