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Flexural Properties - ASTM D790
A test specimen is held as a simply supported beam and is subjected to three-point bending. The specimen is deflected until it either breaks or the outer fiber strain reaches 5%.
Two procedures are used for flexural testing.
Procedure | Description | Strain Rate |
---|---|---|
A | For materials that break at relatively small deflections. | 0.01 mm/mm/min |
B | For materials that undergo large deflections during testing. | 0.10 mm/mm/min |
Flexural Test Configuration
Location of Maximum Fiber Stress/Strain
Term | Definition |
---|---|
Flexural Modulus | The ratio of outer fiber stress to outer fiber strain. |
Flexural Stress at Yield | The outer fiber stress corresponding to test specimen yield. |
Flexural Stress at Break | The outer fiber stress corresponding to test specimen failure. |
Flexural Strength | The maximum outer fiber stress sustained by a specimen during testing. |