PSI - Issue 13

Gyo Geun Youn et al. / Procedia Structural Integrity 13 (2018) 1297–1304 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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Fig. 1. Tensile test results of unaged and aged CF8A under monotonic loading condition (a)engineering (b)averaged true stress strain curve

Fig. 2. Hysteresis loop of unaged and aged CF8A (a) 1.20% strain (b) 0.80% strain

2.3. C(T) test results Fracture toughness test was performed using a 0.5T C(T) specimen. The specimen is designed by ASTM E1820 09. It has the thickness of t=12.7mm and the width of W=25.4mm. The specimen has side-groove of 60 o with 0.5mm notch radius. The test was conducted with load line velocity of 1mm/min under both monotonic and cyclic loading condition. Test under cyclic loading condition is performed with load ratio R = P min / P max = -1. The test results under monotonic loading are described in Fig. 3a and the test results under cyclic loading are shown in Fig. 3b.

Fig. 3. CF8A 0.5T C(T) test results (a)monotonic loading J-R curve (b)cyclic loading J-R curve