Properties of Materials Essay Example | Topics and Well Written Essays - 2500 words

Properties of Materials - Essay ExampleThere are two rules of thumb that earn been given in comparing the density of naturals i.e. titanium is nearly half the density of steel and that of atomic number 13 is about one third the density of steel. Any heavy and weak real(a) is considered bad and for a strong and light material is considered good. Stress and strainStress has been described as the tally of ram applied to a certain(prenominal) material divided by the cross sectional battlefield of the material to the direction of the force. Strain properties, on the other hand, indicate how much a material leng accordinglys chthonian stress. Tensile and comprehensive strengthThe strength of a material can be measured by putting a material sample in a powerful materials testing machine, which pulls the materials apart and then records the force required to do so, plus the deformation to the material. Compression strength is determined by subjecting the material under pressure unt il it breaks i.e. heat, allude, et cetera. Tensile and compressive indicators are then recorded. These are good measure of how much impact the building materials can withstand without breaking if subjected to certain pressures (James, 2011, 35).Elastic and plastic deformationAs explained in the stress strain diagrams above, elasticity and plastic deformation occurs prior and after application of a certain amount of stress on a certain material. In figure 2 above, below propose A, we find that steel goes back to its original state hence it is elastic. Beyond point B, the steel cannot go back to its original length hence it is deformed or inelastic. Permanent elongation of a material is called plastic deformation. The same sequel applies to other building materials under different stress conditions. Below is the buck deformation curve Modulus of elasticity This is a coefficient which denotes the ratio of stress per unit area acting on, to piss deformation on a material to the res ulting deformation therefrom. The elastic modulus, E, is usually determined after the compression tests are done on buildings. It differs in various types of materials for building. Elasticity modulus for steel is determined during manufacture objet dart that of a concrete wall is calculated depending on the building dimensions. Task II Figure deuce-ace Graph of load against extension See the excel attachment Modulus of elasticity, E E = 2G(r+1) where G is the modulus of inflexibleness and r is the Poissons ratio. E= (F) (L1)/ (A) (L2) where F is the force or load, L1 is the original length of material (in this case mild steel), L2 is the amount the length changes on application of the load, A is the cross section area that the force is applied on the material. Area of the rod steel is given by the formula, then A= 22/7* 12.52 = 491.07 mm2 E = 50*195 / 491.07*0.09 + 100*195 / 491.07*0.19 + 150*195 / 491.07*0.29 + 160*195 / 491.07*0.34 + 165*195 / 491.07*0.46 + 170*195 / 491.07*0 .78 + 180*195 / 491.07*0.84 + 190*195 / 491.07*0.91 + 200*195 / 491.07*0.98 + 210*195 / 491.07*1.07 + 220*195 / 491.07*1.24