Which property allows timber to sustain short term loads of about 2x the level it can bear on a permanent basis?

Which property allows timber to sustain short term loads of about 2x the level it can bear on a permanent basis?

• A. Elasticity
• B. Shear Strength
• C. Impact Resistance
• D. Bend Radius

Answer: (C)

Timber’s ability to handle a much higher load for a short period is about how it responds to rapid, dynamic forces. When a load is applied quickly, timber can absorb more energy before failing, due to its damping and energy-absorbing characteristics. This is what we call impact resistance. It describes resisting sudden or shock-like loading, which aligns with the idea of sustaining a load roughly twice what it can bear permanently, before the long-term effects like creep reduce capacity. Elasticity, while related to deformation and recovery, doesn’t by itself explain the higher short-term capacity. Shear strength and bend radius pertain to sliding between layers and geometric bending limits, respectively, and don’t capture the dynamic, energy-absorbing behavior that allows short-term loads to exceed long-term capacity.

Timber’s ability to handle a much higher load for a short period is about how it responds to rapid, dynamic forces. When a load is applied quickly, timber can absorb more energy before failing, due to its damping and energy-absorbing characteristics. This is what we call impact resistance. It describes resisting sudden or shock-like loading, which aligns with the idea of sustaining a load roughly twice what it can bear permanently, before the long-term effects like creep reduce capacity.

Elasticity, while related to deformation and recovery, doesn’t by itself explain the higher short-term capacity. Shear strength and bend radius pertain to sliding between layers and geometric bending limits, respectively, and don’t capture the dynamic, energy-absorbing behavior that allows short-term loads to exceed long-term capacity.