Issue34

M. Kikuchi et alii, Frattura ed Integrità Strutturale, 34 (2015) 318-325; DOI: 10.3221/IGF-ESIS.34.34 321   sin 3cos 1 0 I II K K            (5) where K I and K II are Stress Intensity Factors (SIF) in mode I and II, respectively. Fig. 5 (c) shows overlapped result of experiment and numerical simulation. It is noticed that both results agree very well. It also means that MTS criterion is available to predict crack growing direction under mixed mode loading condition. Figure 3 : Specimen of composite material (CFRP & A2017). A2017 CFRP x y z Shape of the test specimen Fiber direction Notch surface Figure 4 : Overview of specimen and direction of fiber. Material constant Young’s modulus E (GPa) Poisson’s ratio  A2017 70.6 0.30 CFRP (perpendicular direction of fiber 9.53 0.49 Table 1 : Material constants. ( a) Experimental result. (b) Numerical simulation (c) Overlapping of both results. Figure 5 : Comparison of crack path in bi-material. C RACK GROWTH IN A BI - MATERIAL OF PMMA AND A6061 ee and Krishnaswamy [10] conducted experiment of crack growth in bi-material made of PMMA and aluminum alloy Al6061. As shown in Fig.6, PMMA and Al6061 were pasted, and initial crack is introduced in PMMA. Three loading conditions are tested, as shown in Fig. 6 (a)-(c), and crack growing paths are obtained. In case (a), L