What is HDPE? Essay

HDPE
HDPE is a bi product of petroleum and finds wide range of medical applications due to large strength to density ratio. It is an inert material with low tissue reactivity [11]. It is malleable and has pores on its surface which can help in tissue growth.
Fig 7- Front view of HDPE Pins before experiment Fig 8- Top view of worn out sample HDPE pins
Fig 9- Comparison of Wear (mum), Coefficient of Friction, Frictional Force (N) respectively versus Time Duration (sec)
The image of Figure 7 depicts a front view of the fresh HDPE pin sample prior to carrying out the experiment. The image of Figure 8 depicts a top view of the same HDPE pin sample after carrying out the experiment. It can be seen that there is a mark formed in the pin surface also better known as indent formation. The image of Figure 9 depicts three Tribological parameters of wear, coefficient of friction and frictional force plotted against time duration respectively. The graph obtained between wear and time initially depicts that there is uniform increase in wear up to two hundred seconds of time duration but after that it exponentially increases. However the magnitude of wear is relatively very less. This polymeric material did not have any threshold point for the given mechanical conditions. Obtained values of coefficient of friction and sliding distances are tabulated later.
SS 304
Stainless steel is a versatile material having lots of applications. It has been in use for medical applications for a long period of time. It is a highly ductile material and can be moulded according to any desired shapes for optimum use [12].Factors like easy availability, low manufacturing cost, good mechanical properties respectively have made it the most obvious choice for researchers to work upon with it.
Fig 10- Front view of SS 304 pins before experiment Fig 11- Top view of worn out sample SS 304 pins
Fig 12- Comparison of Wear (mum), Coefficient of Friction, Frictional Force (N) respectively versus Time Duration (sec)
The image of Figure 10 depicts a front view of the fresh SS 304 pin sample prior to carrying out the experiment. The image of Figure 11 depicts a top view of the same SS 304 pin sample after carrying out the experiment. It can be seen that there is a mark formed in the pin surface also better known as indent formation. The image of Figure 12 depicts three Tribological parameters of wear, coefficient of friction and frictional force plotted against time duration respectively. The graph obtained between wear and time initially depicts that there is uniform increase in wear within first eight hundred seconds of operation, however after that the wear becomes almost constant indicating that maximum wear has taken place in it for the applied mechanical conditions and the material has considerably failed. The coefficient of friction and frictional force graph versus time however depict non uniform obtained curve. The coefficient of friction and sliding distances are tabulated later.