Which destructive testing method is used to assess ductility by bending a coupon in three points?

Which destructive testing method is used to assess ductility by bending a coupon in three points?

• A. Macro sectioning
• B. 3 point bend testing
• C. Ultrasonic Testing
• D. X-ray

Answer: (B)

Ductility is about how much a material can plastically deform before it breaks. To test this under bending, you use a setup where the specimen is supported at two points and a load is applied at the center. This three-point bending creates a strong bending moment, with one side in tension and the other in compression, so you can see how much plastic deformation the coupon can undergo before it fractures. Because the test permanently alters the specimen, it’s destructive, which is why it’s used to assess how the material behaves under flexural loading. The other options don’t fit this specific approach: macro sectioning is for inspecting the macrostructure on a cut cross-section, ultrasonic testing uses sound waves to detect internal flaws without damaging the part, and X-ray imaging visualizes internal features non-destructively.

Ductility is about how much a material can plastically deform before it breaks. To test this under bending, you use a setup where the specimen is supported at two points and a load is applied at the center. This three-point bending creates a strong bending moment, with one side in tension and the other in compression, so you can see how much plastic deformation the coupon can undergo before it fractures. Because the test permanently alters the specimen, it’s destructive, which is why it’s used to assess how the material behaves under flexural loading.

The other options don’t fit this specific approach: macro sectioning is for inspecting the macrostructure on a cut cross-section, ultrasonic testing uses sound waves to detect internal flaws without damaging the part, and X-ray imaging visualizes internal features non-destructively.