Model Formulation for the Rupture Mechanism of Syringes Produced in A Typical Syringe Plant
Abstract
In a previous research work, attempt was made to improve upon the productivity of the syringe plant of First Medical & Sterile Product, Port Harcourt, Nigeria, by using time and motion study. The innate requirement for quality assurance and integrity of the manufactured products medically when put to use sensitize the consciousness of the researchers to delve into the design and rupture mechanism of the syringe barrel. Two design models were proposed. These are cylindrical barrel with flat ends and cylindrical barrel with hemispherical ends. Stress and force analysis projected the cylindrical barrel with flat ends as more suitable design on the basis of crack propagation, bursting or mode of failure by rupture. For the cylindrical barrel, force equilibrium to prevent bursting in transverse direction was confirmed to be 5.4711N while force equilibrium to stop bursting in the longitudinal direction was 89.01N. The force equilibrium was established on the basis of equality of the stress force and pressure force of the enclosed fluid.
The results of cylindrical barrel with hemispherical ends was catastrophic in the sense that equilibrium of stresses and forces to avoid crack propagation or busting could only hold in the longitudinal direction. So to say that, equilibrium of stresses and forces failed in transverse directions, resulting in longitudinal rupture or bursting of the cylinder. The numerical values of the stress force and fluid pressure force being 99.95N and 94.48N respectively.
To this end the design and rupture mechanism of the syringe barrel of First Medical & Sterile Product had been established with cylindrical barrel having flat ends being the approved design.
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Introduction
In the work titled, “improvement of productivity and work measurement in a typical syringe plant, the researchers had been able to produce practicable master piece of work to impart upon the productive capacity of the case study company. The quest for quality assurance, quality specification and safety of the product when in use led to the development of formulation for the design and rupture mechanism of the syringe barrel of First Medical & Sterile Product.
Conclusion
The cylindrical syringe barrel design with flat ends is the preferred option to the cylindrical barrel with hemispherical ends. The cylindrical barrel design with hemispherical ends is prone to the case of developing crack or bursting in the longitudinal plane. The reason being that the hoop stress force and internal fluid pressure force do not agree. That is to say the hoop stress force is 99.95N while the fluid pressure force is 94.48N.