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# Statics: Lecture5a

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• 1. Today:Internal effects in beamsBook: Chapter 7.1-7.3 + hand outs
• 2. Calculate the internal forces in C. BA C
• 3. Name conventionA cutting plane is positive when the perpendicular coordinateaxis (e.g. the x-axis) is pointing outward.
• 4. Sign conventionNormal and shear forces are positive when they are acting on apositive cutting-plane in the positive x- or y-direction, or when itis acting on a negative cutting-plane in the negative direction.A bending moment is positive when it gives rise to a tensilestress in the side of the beam on the positive z-direction.
• 5. Sign convention Positive section plane
• 6. Interaction
• 7. Normal stressShear stresses
• 8. Sign conventionA stress component is positive when it is acting on a positivecutting-plane in the positive direction, or when it is acting on anegative cutting-plane in the negative direction.A stress component is negative otherwise.
• 9.  xz Note: the stresses are drawn in their positive directions.
• 10. Interaction force in two-dimensional calculationsNormal force NShear force Vz = VBending moment My = M
• 11. Determine the shear force and moment diagram of the cantilever beam. BA (Determine the interaction force V and M for every position x on the beam).
• 12. Determine the shear force and moment diagram of this structure.A D B C
• 13. Determine the shear force and moment diagram of the wing of this airplane.
• 14. Determine the normal force diagram in the bar with length L, cross-section A and density ρ due its own weight. Bonus: The column is made of steel, ρ=7800 kg/m3 with an ultimate stress σu=400 MPa. For what length L will the beam fail due to its own weight?Handout: Elaboration_pendulum_example_Lecture_5a.pdf