Discussion Tensile Test 2

DISCUSSION Universal Testing Machine The testing machine will add force slowly by the load to the specimen until the plastic  break. Maximize load and yield load can be determine from the machine scale. The The extensometer was fixed at the specimen for determining the elongation.Along the elastic deformation until yield stress, the specimens will return back to its original size whenever the force was removed. After the yield stress, plastic deformation will occur. This is because of the perspective atoms and the bonding from the original atoms will stop and joined with the neighbours atoms. ence, the change involved with the big amount of atoms and after the force was removed, the specimen cannot return back to its original but has a permanent elongation. The deformation will proper until the tensile strength limit. After this limit, the !necking" phenomenon will happen. The fracture ultimately occurs at the neck. The fracture strength corresponds to the stress at fracture.

#rom the result obtained, the comparison of the mechanical properties can be made $ %.&tress At Maximum 'oad ()ltimate Tensile Tensile &trength* )T& is the highest tensile strength (or tensile stress* a material can experienced before it fractured. The higher the tensile strength of a material, the harder it is.#rom results, we can conclude that +T has the highest tensile strength, followed by +-M,A&, ++, and +/. &ince tensile strength of a material is the maximum amount of tensile stress that it can be subjected to before failure therefore.&ince +T has the highest tensile strength, it is the hardest amongst the five materials tested, whereas +/ is the softest as it has the lowest tensile strength. The maximum tensile strength of all the five materials can be compared as the below se0uence $ +T 1 +-M 1 A& 1 ++ 1 +/ 2.Maximum Percent Strain (Elongation ercent! +ercentage of elongation is used to represent the ductility of the material. A higher percentage of elongation of the material means it is more ductile and it can resist more stress than the others.#rom results, it is observed that +/ has the highest maximum percent strain and followed by +-M, ++, A& and +T. This This also means that +/ has the highest ductility compared to other polymers thus it can be stretched longer before it deforms. The maximum  percent strain of all the five materials can be compared as the below se0uence $

+/ 1 +-M 1 ++ 1 A& 1 +T ".#oung$s ".#oung$s Mo%ulus Mo% ulus 2oung3s 2oung3s Modulus Modulus is a property that measures the amount of stress needed to produce a given strain.The higher the value of 2ou 2oung3s ng3s Modulus Modulus of a material, the higher the capability of that tha t material to resist elastic deformation and it is more stiff and rigid. #rom results, we can find that +T has the highest value of Modulus 2oung 2oung followed by +-M, A&, ++ and +/. This indicates that +T has the highest tensile modulus, which means it resists deformation the most. 4hile +/ has the lowest tensile modulus, which means it is easily deformed.5t also shows that +T is the most rigid material of all the five. The maximum 2ou 2oung3s ng3s Modulus of all the five materials can be compared as the below se0uence $

+T 1 +-M 1 A& 1 ++ 1 +/