Report No. 77-2 COMPLETE STRESS-STRAIN CURVE OF CONCRETE ...
Stress-Strain Curve
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Stress-Strain Curve: Stress-strain curves will have a modulus of elasticity, the slope leading up to the yield point. Along this line, a material can take the pressure and will only elastically deform. Meaning, the material will go back to its original state without a change in its properties or dimensions. Its like bending a paperclip, the paperclip be slightly bent without the shape changing. Once you bend the paperclip far enough, the paperclip will reach its yield point and begin to plastically deform. Plastically deform means you have permanently altered the shape and now you begin to effect the strength of the material. If stress is continually applied, let’s say as a tensile test, then an ultimate tensile strength will have been reached. This is where plastic deformation continues and worsens. And eventually a breaking point for all materials will have been reached, when discussing most metals; the breaking point is less than the ultimate tensile strength due to the loss in cross sectional area. There are many materials that will also break at its own yield point, which can include glass, some plastics, and cast iron. The actual stress-strain curve really depends on the material that is being tested. There are two types of material. 1-Brittle materials 2-Ductile materials Ghulam Mehdi [email protected] Pge 1
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Transcript of Stress-Strain Curve
Stress-Strain Curve:
Stress-strain curves will have a modulus of elasticity, the slope leading up to the yield point. Along this line, a material can take the pressure and will only elastically deform. Meaning, the material will go back to its original state without a change in its properties or dimensions. Its like bending a paperclip, the paperclip be slightly bent without the shape changing. Once you bend the paperclip far enough, the paperclip will reach its yield point and begin to plastically deform. Plastically deform means you have permanently altered the shape and now you begin to effect the strength of the material. If stress is continually applied, let’s say as a tensile test, then an ultimate tensile strength will have been reached. This is where plastic deformation continues and worsens. And eventually a breaking point for all materials will have been reached, when discussing most metals; the breaking point is less than the ultimate tensile strength due to the loss in cross sectional area.
There are many materials that will also break at its own yield point, which can include glass, some plastics, and cast iron. The actual stress-strain curve really depends on the material that is being tested.
There are two types of material.
1-Brittle materials
2-Ductile materials
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Stress-Strain Curve Diagram for Brittle Materials:
Brittle Materials:
Brittle materials are those substances which rupture occurs without any noticeable prior change in the rate of elongation.
For example: cast iron, glass, and stone etc.
Stress-Strain Curve Diagram for Brittle Materials:
Ductile Materials:
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Ductile materials are characterized by their ability to yield at normal temperatures which includes structural steel, as well as many alloys of other metals etc.
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