The ASTM D790 test standard specifies the characterization of flexural properties of unreinforced and reinforced plastics. The test is performed by applying a flexural load to a standard specimen. Common properties that reference ASTM D790 include the flexural modulus, flexural strength and strain at yield, flexural stress and strain at peak load (more appropriate for ductile plastics) and at break (more appropriate for brittle plastics), flexural stress-strain curve, and offset yield stress and strain at flex.
Learn more about Flexural Testing, as well as about Mechanical Testing more generally. DatapointLabs has extensive Testing Capabilities covering all aspects of mechanical, thermal, rheological and density-related materials characterization.
The entire list of tests in the DatapointLabs test catalog that reference ASTM D790 are as follows:
Test | Description |
---|---|
M-015 | Flexural Modulus and Strength |
M-221 | 3 Point Flexural Stress-Strain, Strength and Modulus |
M-225 | 4 Point Flexural Stress-Strain, Strength and Modulus |
M-230 | High Speed 3 Point Flexural Stress-Strain |
V-150 | Ribbed Plaque Flexural Validation for Abaqus *Elastic *Plastic Model |
V-151 | Ribbed Plaque Flexural Validation for Elastic Plastic Model |
V-170 | Torsional Crank Validation of Additive Material Models in ANSYS |
V-171 | Torsional Crank Validation of Additive Material Models in Abaqus |
V-172 | Torsional Crank Validation of Additive Material Models in RADIOSS |
DatapointLabs offers a number of tests that address different properties covered under the ASTM D790 standard. These include the following characterization measurements [bracketed links refer to relevant tests in the DatapointLabs Test Catalog]:
Typical characterization measurements under ASTM D790 include:
The specific test procedure will vary by test and the individual test webpages (linked to above and below) should be consulted for relevant descriptions. In general, a universal testing machine (UTM) is used to determine the appropriate flexural property or properties under measure. The test specimen is placed on a span. The UTM crosshead, with either a single-point nose (3-point test) or double-point nose (4-point test), is lowered until just above specimen. The test is performed at a constant velocity, using a calculated value for the required strain rate. The load and corresponding specimen deflection are recorded. The double-point nose of a 4-point test provides a distribution of applied stress and is used in cases where the single-point nose of a 3-point test would create a region of localized stress concentration. For high-speed flexural characterization, a Dynatup 8250 drop tower is used instead of a UTM.
Sample conditioning, if required, is carried out following specimen preparation in accordance with ASTM D618. Typical conditioning selections are ‘dry as molded’ (low humidity storage at 23°C) and 40 hours at 23°C and 50% relative humidity. Non-ambient testing may be carried out at any temperature between -53°C and 200°C.
Specimen specifications under ASTM D790 are as follows: