Physics

Impact Test Calculator

Find the energy absorbed in a pendulum impact (Charpy/Izod) test.

Hammer mass

Initial height

Final height

Gravity (m/s²)

Calculated Output

Absorbed energy (J) 137.34

Formula: E = m·g·(h₀ − h₁)

Step-by-Step Breakdown

1. Values used:

2. Hammer mass = 20

3. Initial height = 1.5

4. Final height = 0.8

5. Gravity = 9.81 m/s²

7. Absorbed energy = 137.34J

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The math behind it

Absorbed energy = m·g·(h₀ − h₁), the drop in the pendulum's height after breaking the specimen.

20 kg hammer, 1.5 → 0.8 m → about 137 J absorbed.

What does high absorbed energy mean?

A tougher, more ductile material that resists fracture.