Abstract
This paper extends the previous works that appears in the International Journal of Multiphysics, Varatharajoo, Salit and Goh (2010). An approach incorporating cohesive zone modelling technique is incorporated into an optimized flywheel to properly simulate the stresses at the layer interfaces. Investigation on several fiber stacking sequences are also conducted to demonstrate the effect of fiber orientations on the overall rotor stress as well as the interface stress behaviour. The results demonstrated that the rotor interlaminar stresses are within the rotor materials' ultimate strength and that the fiber direction with a combination of 45°/-45°/0° offers the best triple layer rotor among the few combinations selected for this analysis. It was shown that the present approach can facilitate also further investigation on the interface stress behaviour of rotating rotors.
Highlights
The flywheel energy storage technology is a promising technology in replacing the conventional battery as energy storage devices for spacecraft
In the context of flywheels in space applications, it is observed that the operation of the flywheel has been well investigated in the works of Varatharajoo and Kahle (2005) on the feasibility of the combined energy and attitude control system (CEACS); Varatharajoo and Fasoulas (2002, 2005), Varatharajoo (2006), Roithmayer et al (2003), as well as Tsiotras et al (2001) on the CEACS attitude control performances; Varatharajoo, Wooi and Mailah (2011) where Active Force Control (AFC) techniques has been integrated for the enhancement of the attitude control of CEACS; and Varatharajoo (2004) on CEACS for small satellites
Where interlaminar stresses are concerned, severe out- of- plane stresses are noted at the interfaces where the sudden material transitions occur. The investigation of these stresses are especially crucial, as the initiation of these stresses have been attributed to the onset of delamination and transverse cracking unique to hoop wound composite rotors, which if are to propagate to a substantial region of the rotor might result in the subsequent loss of strength and stiffness that would adversely affects the smooth operation of the flywheel
Summary
The flywheel energy storage technology is a promising technology in replacing the conventional battery as energy storage devices for spacecraft. The validated model is extended to the double layer model where the novel approach of using the cohesive zone modelling technique to simulate the interface stress behaviour has been incorporated to the double layer model which is compared with the analytical and numerical solution by Tahani. It is discovered that the results for the cohesive zone model closely approximate the trends of the analytical solutions by Tahani (2004), indicating the cohesive zone modeling approach as a feasible conceptual design tool for future replication in simulating stresses at the interface of material discontinuity. The work demonstrates how fiber orientation alters the stress distribution of the flywheel rotor as well as the use of cohesive zone elements in simulating the three dimensional stress effects at the interface
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