## 3 Results
### Discussions  
From Figures 2-8, the range of the von Mises stress for the collapsed plate is lower than that of the extended one. This pattern applies to all of the materials. This is justifiable because, at the collapsed position, the two plates are placed on each other; hence, they support each other. The properties measured here are important because the safety of the patient depends on the durability of the plates in various conditions. These plates assist in patient transfer from one platform to another, sometimes from the wheelchair to the car or the bed. The swivel works as a sideways slider, making the patient turn without having to lift their bodies or be lifted by others. The sliding speed and rotation area are very important, hence the kinematic analysis, which provides the operating conditions for the plate. This also takes into consideration the weight of the patient as it affects the movement of the plate. All these considerations call for a diligent selection of the materials of the swivel plate. The mechanical properties of each of these materials determine their suitability, among other considerations such as cost, availability, weight, and aesthetics. From the results in Table 3, AA 6061 has the highest yield strength, and SS 316L has the lowest value of yield strength. The yield strength for SS 316L is 1.724 (10\({}^{8}\)) MPa, AA 6061 is 2.750 (10\({}^{8}\)) MPa, and Ti6 Al4V is 8.274 (10\({}^{8}\)) MPa. In terms of the factor of safety, the difference between the values of collapsed and extended plates varied between 6-10%. From Figures 7 and 8, the range of values for the factors of safety for the materials are SS 316L (0.61-0.92), AA 6061 (0.98-1.5), and Ti6 Al4V (2.95-4.424). For the elastic modulus, SS 316L has a higher value (4.7 GPa) compared to the AA 6061 and Ti6 Al4V with 1.71 GPa and 1.8 GPa, respectively, when the mechanism is fully extended. Similarly, Figures 5 and 6 show that AA 6061 and Ti6 Al4V outperformed SS 316L in terms of displacement because of higher yield strength and the factor of safety values. From Figures 5 and 6, the values of displacement covering both collapsed and extended scenarios varied between 2.441-3.794 mm for SS 316L and 6.751-10.491 mm for AA 6061 and 4.463-6.939 mm for Ti6 Al4V. From these values, the range of the displacement values when force was applied from 1 kN to 1.5 kN is 0.241-0.37 mm for AA 6061, 0.088-0.133 mm for SS 316L, and 0.103-0.244 mm for Ti6 Al4V. These values are all less than 1 mm for all the scenarios. Hence, each of these materials is safe to use, and AA 6061 or Ti6 Al4V is suitable for replacing SS 316L as material for the swivel mechanism on this basis. The change in modulus when 1.5 kN forces were applied for fully collapsed and fully extended are 3. 658% and 3.653% for AA 6061, 3.479% and 3.5% for SS 316L, and 3.52% and 3.516% for Ti6 Al4V. The yield strength of the titanium alloy is 4.8 times that of steel alloy, whereas aluminum alloy is 1.6 times that of steel alloy. In addition, the elastic modulus of SS 316L is approximately 2.7 times that of Ti6 Al4V and AA 6061. Because the yield strength and elastic modulus values have a relative proportionality, the mechanism's dimensions are appropriate for any material. Furthermore, the yield strength property of  
Figure 8: The factor of safety when the swivel plate is fully extended. the alternative materials shows that they will perform well as a replacement for SS 316L when considering performance within the elastic zone. Looking at the properties of the three materials, Ti6 Al4V gave better yield strength and is therefore preferred. Given that the values obtained for Ti6 Al4V and AA 6061 are very close, and it is common knowledge that aluminum is cheaper than titanium and most steel materials, AA 6061 can be a choice when cost implication is a major consideration. However, considering the strength-to-weight ratio and yield strength, Ti6 Al4V is preferable. When patients are assisted in the operation of the swivel mechanism, the patient's weight contributes to the operation.