The specimen in a Charpy impact test is supported as a:
Try it first: pick an option, then read the explanation.
Correct answer: B. simply supported beam
Asked in SSC JE 2004
Detailed Explanation
The book places this material-testing question in the columns chapter. Impact tests measure the energy a notched specimen absorbs when broken by a swinging pendulum.
Why “simply supported beam” Is Correct
In the Charpy test the notched bar lies horizontally on two anvils and the striker hits the middle, opposite the notch — a simply supported beam.
| Test | Specimen support | Notch faces |
|---|---|---|
| Charpy | Simply supported beam (horizontal) | Away from the striker |
| Izod | Cantilever (clamped vertically) | Towards the striker |
Why the Other Options Are Wrong
- A. cantilever beam: Cantilever support is used in the Izod test.
- C. fixed beam: Neither impact test clamps both ends.
- D. continuous beam: There are only two supports — not a continuous beam.
Key Point
Charpy → simply supported; Izod → cantilever.
Key Concepts for Students
- Impact energy indicates toughness.
- Charpy tests reveal the ductile–brittle transition temperature.
- Standard Charpy specimen: 10 × 10 × 55 mm with V-notch.
Practice more: this is question 40 in Columns and Struts MCQs – Part 3. Try the whole set and check every answer instantly.