L16 - Exam II • Next Friday 2pm(March 28 • Covers...

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Unformatted text preview: Exam II • Next Friday 2pm (March 28) • Covers Chapters 4-6 (L9-L15) • 1 page crib sheet- double sided (no worked-out problems) • 4 problems • Sample exam posted on blackboard Ch7: Stress transformation • state of stress: 6 components , , normal stresses , , shearing stresses (Note: , , ) x y z xy yz zx x y y x y z z y z x x z σ σ σ τ τ τ τ τ τ τ τ τ = = = • Same state of stress is represented by a different set of components if axes are rotated. • Transformation Plane Stress • Plane Stress- state of stress in which two faces of the cubic element are free of stress. (2-D stress) Happens when: • thin plate subjected to forces acting in the midplane of the plate. xy , , . and x y z z x z y σ σ τ σ τ τ = = = • free surface of a structural element or machine component, i.e., at any point of the surface not subjected to an external force. Transformation of Plane Stress • equilibrium of a prismatic element with faces perpendicular to the x , y , and x’...
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L16 - Exam II • Next Friday 2pm(March 28 • Covers...

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