Experiment on Properties of Materials Essay Sample

Purpose
To cipher a scope of different belongingss ( steel. aluminium metal. pure aluminum. PMMA. lumber and nylon ) and step warp at failure. energy stored at failure and the immature modulus for each of the several stuffs.

Materials and methods
Materials used to carry on the experiment were deflection rig. two weight hangers. stuff rods ( steel aluminum metal pure aluminum PMMA. lumber. nylon ) changing weights. swayer. electronic vernier caliper. Method

Before the experiment was conducted. protective goggles was worn to guarantee eyes are protected from fragments of winging stuffs that are likely to come approximately as a consequence of interrupting the rods. After review of the setup the venier calipers was closed and turned to enter in millimeters. The steel rod was placed into the nylon collect and tightened. measuring of 200 millimeter was taken from nylon ferrule and weight hanger is placed on the steel rod so locked afterwards. Venier is lowered until it comes into contact with the steel rod and the reset to read to read 0. 00mm on the show. Weight of 1 kilogram was placed on the hanger and the venier lowered until it touches the top of rod. The warp is so recorded. and placed in a tabular array as in fig 1 ; theoretical warp of merely the steel rod. ferrule warp and ferrule warp per kg and mean ferrule warp is calculated for the steel rod

The remainder of the stuffs are tested in the order of aluminium metal. pure aluminum. PMMA. lumber and so nylon. In all cases force was calculated. measured warp. ferrule warp and material warp. so put in a signifier of tabular array as illustrated in fig For the aluminum a weight increase of 1 kilogram was used and 6 readings acquired. For the pure aluminum a weight increase of 1kg was used merely three readings was recorded as a consequence of the caliper non being able to take readings when more than 3 kilogram is added. For PMMA a weight increase of 0. 2 kilograms get downing off with a weight of 0. 2 With the lumber rod the weight increase of 0. 1 kilogram was used. stuff failed after it reaches a weight of 2. 2kg For the nylon rod a weight increase of 0. 1 kilogram was used. the caliper could non read any longer than 0. 5 kg a force warp graph was plotted based on the information from the measurings. with the force on Y and warp on the ten axes.

Decision
From the consequences it can be concluded that steel has got the highest immature modulus among the stuffs tested. steels high modulus makes it hold big strength hence its suitableness for big constructions such as high lifting edifices. Bridgess. oil rigs etc. The stiffness of steel as a belongings enables it to defy bending ; steels tensile strength makes it defy big weights Aluminium metal besides depicts a big immature modulus as compared to the others and larger strength. with low tensile strength. Aluminium metal can besides be used in edifice due to this ground. Aluminium metal was besides detected to hold a greater output than aluminum and the remainder of the stuffs with the exclusion of steel. Energy stored at failure and warp failure or steel could non be determined because. failure was non reached in that peculiar stuff.

Premises
Young modulus for steel is 2. 07?10^5
Experiment was performed under room temperature
Weight used in the experiment is accurately calibrated and right weight displayed on the weight Further premises was that the immature modulus for all the stuffs can be measured by gradient of the force /deflection of the stuff divided by the gradient of the force warp of steel multiplied by 2. 07?105.