Lec3 - Chapter 2 Axial loading Stress & Strain: Axial...

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Chapter 2 Axial loading
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Stress & Strain: Axial Loading • Under loading •stresses • deformations • statics analyses are not sufficient • Deformable structures allows: • determination of member forces/reactions that are statically indeterminate • Stress distribution requires deformations in a member
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Normal Strain strain normal = = L δ ε A normal stress = = P σ δ : change in length L: original length ε : strain
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Normal Strain -cont. L A P A P δ ε σ = = = 2 2
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Normal Strain-cont. L L A P δδ ε σ = = = 2 2
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Stress-Strain Test
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Stress-Strain Diagram: Ductile Materials - able to be drawn out into a thin wire; able to be deformed without losing toughness; pliable, not brittle. Yield strength breaking strength ultimate strength
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Stress-Strain Diagram: Brittle Materials hard but liable to break or shatter easily
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Strain related definitions To find ductility of a material: Strain (Percent elongation): 0 0 *100% B LL L True Strain: ε t = ln L L 0 (Typically used for large deformation) (Typically used for small deformation)
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This note was uploaded on 04/20/2008 for the course ENGR 2530 taught by Professor Lindaschadlerfeist during the Spring '08 term at Rensselaer Polytechnic Institute.

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Lec3 - Chapter 2 Axial loading Stress & Strain: Axial...

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