INTRO STRESS

What is force?

What is the definition of Impact Load Force?

• Area of the contact is small compared to the size of body

  (act at a point)

• Supporting forces

• Transfer large amount of energy in a short time

• Do not vary with time, pressure/temperature.

What is the definition of Reaction Force?

• All force acting on FBD

• Supporting forces

• Load that applied/removed many thousand times

• Act at a point (area of contact is small compared to the size of the body)

Which is the correct support reaction for a roller connection?

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Which is the correct support reaction for an external pin connection?

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Choose the correct match of internal resultant loadings.

• A : Torsional moment/torque

  B : Normal force

  C : Bending moment

  D : Shear force

• A : Normal force

  B : Torsional moment/torque

  C : Shear force

  D : Bending moment

• A : Torsional moment/torque

  B : Normal force

  C : Shear force

  D : Bending moment

• A : Normal force

  B : Torsional moment/torque

  C : Bending moment

  D : Shear force

"Developed when the external loads tend to twist one segment with respect to the other".

Which of the following resultant loadings matches the statement above?

• Shear Force

• Torque

• Bending moment

• Normal force

Choose the correct match for the resultant co-planar loadings.

• A = Normal force

  B = Torque

  C = Shear force

• A = Shear force

  B = Torque

  C = Normal force

• A = Shear force

  B = Bending moment

  C = Normal force

• A = Normal force

  B = Bending moment

  C = Shear force

How to obtain A?

• Applying

  Σ Fx + Fy = 0

• Applying Σ Fx = 0

• Applying Σ Fy = 0

• Assuming

  Σ Fx = Σ Fy

What are the conditions that satisfy the equilibrium of a rigid body?

• ΣF = 0

• ΣMo = 0

• ΣFx = ΣFy