# Discussion on Stress and Strain of Aluminum.

Hello, I am looking for someone to write an article on Stress and Strain of Aluminum. It needs to be at least 1250 words. A fracture may be experienced if a strain continues beyond the proportionate limit. At zero, the graph is starting to form linearity, however, it reaches 100 when it starts to decrease which can be associated with the proportionate limit.

The graph of stress against strain was reduced in a range just larger than the original portion.

Strain (Єe) is the fractional length change of a stretched material, while stress (σe) is the force per unit area of the stretched material. Therefore, deformation is a change in the size or shape of the object.&nbsp.According to Hooke’s law, the deformation is proportional to the deforming forces as long as they are not too large.

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Young’s modulus or elastic modulus has the same units as those of stress (Pa or N/M2) and can be thought of as the inherent stiffness of material because it measures the resistance of the material to elongation or compression. So, materials that stretch easily and are flexible such as rubber have low Young’s modulus. While materials that are stiff such as steel have high Young’s modulus. it takes larger stress to produce the same strain.

Yield stress is the stress which is required to deform the material, it is at that point when a permanent deformation takes place. It is usually at 0.2%. in this case of aluminum, yield stress begins at 0.4%. At the point there is an intersection between strain and yield stress and strain is called off-set stress.

As strain is increased, many materials eventually deviate from this linear proportionality, the point of departure being termed the proportional limit. This nonlinearity is usually associated with stress-induced “plastic” ﬂow in the specimen. Here the material is undergoing a rearrangement of its internal molecular or microscopic structure, in which atoms are being moved to new equilibrium positions. This plasticity requires a mechanism for molecular mobility, which in crystalline materials can arise from dislocation motion.&nbsp. Materials lacking this mobility, for instance, by having internal microstructures that block dislocation motion, are usually brittle rather than ductile.