Impact energy is the amount of energy required to fracture or break a material under a sudden applied force or load. It is used in materials science and engineering to assess a material's toughness, its ability to absorb energy and resist breaking when subjected to rapid stress, such as a collision or blow.
Impact Energy Formula |
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\( m \;=\; \dfrac{ 2 \cdot E_i }{ v^2 } \)
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| Symbol | English | Metric |
| \( E_i \) = Impact Energy | \(lbf-ft\) | \(J\) |
| \( m \) = Mass | \(lbm\) | \(kg\) |
| \( v \) = Velocity | \(ft\;/\;sec\) | \(m\;/\;s\) |
This value, is an indicator of the material's notch toughness or its ability to resist brittle fracture under dynamic loading conditions. Higher impact energy values generally indicate greater toughness, meaning the material can absorb more energy before breaking, while lower values suggest a tendency toward brittle behavior. The test is particularly useful for evaluating temperature-dependent ductile-to-brittle transition behavior in metals and other materials.
