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Engineering and Construction
Pages 10 (2510 words)
Properties of Materials Name: Institution: Tutor: Subject: Date: Task I Density This is the mass per unit volume of a material or it can be defined also as the mass of a substance divided by its volume. Examples of density of materials are: 4-6 titanium weighs 0.610 pounds per cubic inch; 6061 aluminum weighs 0.098 pounds per cubic inch; 4130 steel weighs 0.283 pounds per cubic inch.
Stress and strain Stress has been described as the amount of force applied to a certain material divided by the cross sectional area of the material to the direction of the force. Strain properties, on the other hand, indicate how much a material lengthens under stress. This is measured by dividing the distance the materials over its original length. Below is a typical diagram of a stress-strain curve for different materials. The Figure below denotes the stress-strain curve for steel under different measures of stress: Figure 2: From the above diagram, we can deduce that strain increases faster than stress at any one point beyond point A. Below this point, any steel specimen whether loaded or unloaded would easily return to its original length, which is described as elastic behaviour. Beyond point B, any additional stress results into deformation or inelasticity (George et al, 2002, 26). Tensile and comprehensive strength The 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 until it breaks i.e. heat, impact, et cetera. ...
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