Flexural Properties - ASTM D790
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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. |
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