Which term means becoming bent due to force, heat, or weakness?

• A. Buckling
• B. Deflection
• C. Crack
• D. Damage

Answer: (A)

Buckling describes a stability-driven deformation where a structural member bends or bows out under compressive force, and this tendency can be amplified by heat reducing stiffness or by material weakness. It’s not just bending from a load—that’s deflection—but an instability that causes a sudden or large lateral deformation and loss of load-carrying capacity. That’s why this term best fits the description of becoming bent due to force, heat, or weakness.

Deflection is the ordinary bending or displacement a member undergoes under load, typically within its elastic range and without instability. Crack refers to fracture or cracking of the material, not a bending shape change. Damage is a broad, non-specific term for impairment and doesn’t specify bending from instability.