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akkshaya
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why does stress decrease after it reaches its maximum tensile strength after its plastic range ?
akkshaya said:i still don't uderstand how the load falls off if the area of cross section decreases after the application of a lot of stress..
nvn said:The load decreases if the engineering stress-strain curve y coordinate decreases.
A stress-strain diagram is a graphical representation of the relationship between stress and strain in a material. It shows how a material responds to external forces and provides valuable information about its strength, ductility, and toughness. This diagram is important because it helps engineers and scientists understand the mechanical properties of a material, which is crucial for designing and predicting the behavior of structures and products.
Stress is measured in units of force per unit area, such as pounds per square inch (psi) or Newtons per square meter (N/m^2). It represents the amount of force applied to a material per unit of its cross-sectional area. Strain, on the other hand, is a measure of the deformation of a material and is typically expressed as a percentage change in length or volume. It is calculated by dividing the change in length or volume by the original length or volume of the material.
Elastic deformation occurs when a material is stretched or compressed but returns to its original shape once the external forces are removed. This is represented by the linear portion of the stress-strain curve, known as the elastic region. Plastic deformation, on the other hand, occurs when the material is permanently deformed and does not return to its original shape. This is seen in the curved portion of the stress-strain curve, known as the plastic region.
Tensile strength is the maximum stress that a material can withstand before it breaks. It is typically determined by finding the point on the stress-strain curve where the material begins to fail, known as the ultimate tensile strength. This is represented by the highest point on the curve and is an important factor in determining the suitability of a material for a specific application.
Yes, a stress-strain diagram can be used to compare the mechanical properties of different materials. By analyzing the shape of the curve, engineers and scientists can determine which material is stronger, more ductile, or more brittle. This information is crucial in selecting the appropriate material for a specific application, such as building construction or manufacturing of products.