Question:
Beach marks are observed in:
Beach marks are observed in:
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Beach marks indicate progressive crack growth under cyclic loading.
Updated On: Jun 29, 2026
- Impact failure
- Tensile failure
- Shear failure
- Fatigue failure
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The Correct Option is D
Solution and Explanation
Concept:
Beach marks (or clam shell marks) are macroscopic features seen on fracture surfaces due to:
- cyclic loading
- crack propagation in stages
- variation in loading conditions
They are typical indicators of fatigue failure.
Step 1: Understand fatigue mechanism.
Fatigue failure occurs due to: \[ \text{repeated cyclic stress below yield strength} \] Crack grows incrementally.
Step 2: Formation of beach marks.
Each load cycle or load variation produces: - a visible arrest line - a concentric pattern on fracture surface These are called beach marks. Final Answer: \[ \boxed{\text{Fatigue failure}} \]
Step 1: Understand fatigue mechanism.
Fatigue failure occurs due to: \[ \text{repeated cyclic stress below yield strength} \] Crack grows incrementally.
Step 2: Formation of beach marks.
Each load cycle or load variation produces: - a visible arrest line - a concentric pattern on fracture surface These are called beach marks. Final Answer: \[ \boxed{\text{Fatigue failure}} \]
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