What type of load or force on an object has changing or cyclic force applied to an object requiring a higher amount of ductility?

• A. Dynamic load
• B. Static load
• C. Thermal load
• D. Dead load

Answer: (A)

Dynamic loads are time-varying forces, including cyclic or impact loads. When a structure or component is subjected to repeated or fluctuating forces, the material needs to deform plastically and absorb energy without sudden fracture. Higher ductility helps accommodate these repeated deformations, delay crack initiation, and reduce the risk of brittle failure under changing loads. Static loads stay constant, so ductility isn’t as critical. Thermal loads come from temperature changes causing expansion or contraction, and dead loads are permanent weights; neither emphasizes repeated deformation like dynamic loading does.