Is using force flow to study stress in a component an art or a science? Can the

Question

Is using force flow to study stress in a component an art or a science? Can the con­cept of force flow be used to study problems where numerical values for loads are indeterminate? How can an engineer best explain why free-body diagrams are so important in deter­mining forces and stresses? A shaft is supported by bearings at locations A and B and is loaded with a downward 1000-N force as shown in Figure P4.77. Find the maximum stress at the shaft fillet. The critical shaft fillet is 70 mm from B.

Explanation / Answer

Free-body diagrams allow for visualization of forces on a part. It allows the application of the equations of motion in order to determine unknown forces and moments, thus analyzing the static and dynamic properties of a body. For a structure, FBDs help in determining shear forces and bending moments.

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