1.Difference between 1st angle &3rd angle projection 2.Stress strain graphs for different materials 3. Material properties etc

Question

Accepted Answer

1st angle and 3rd angle projection differ in the placement of the object and the observer in relation to the projection plane.

1st angle projection places the object in front of the projection plane, while 3rd angle projection places the object behind the projection plane.
In 1st angle projection, the observer views the object from the opposite side of the projection plane, while in 3rd angle projection, the observer views the object from the same side as the projection plane.
1st angle projection is commonly used in Europe and Asia, while 3rd angle projection is commonly used in North America.
Stress-strain graphs depict the relationship between stress (force per unit area) and strain (deformation) for different materials.
Different materials exhibit different stress-strain behaviors, such as brittle materials showing little deformation before fracture, while ductile materials show significant deformation before failure.
Material properties refer to the characteristics and behavior of a material, including mechanical, thermal, electrical, and chemical properties.
Examples of material properties include strength, hardness, conductivity, and corrosion resistance.

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