Standard Test Methods for Bend Testing of Material for Ductility
Theory:
ASTM E290 covers a bend test for flat metal samples of metallic material. Most tests are performed as a 3 pt. bend test at either a 90 or 180 degree angle. In many cases this is a pass/fail test. If the metal sample does not crack or break at the specified angle, it passes the test.
Geometry:
The 3 point bend test can be performed on different sized samples. There are several key paramaters including the sample thickness (T), and the sample width (W). Also, the radius (R) of the bending fin or loading nose, and the distance (C) between the two loading points are important. In cylindrical samples the Diameter (D) of the rod is used instead of the Thickness (T) of the sheet.
Solution:
Universal Grip offers an adjustable bend fixtue which can be used in conjunction with a Galdabini Universal testing machine. The distance (C) between the two loading supports is adjustable on the fixture. This feature allows testing to be done on different sized sample specimens. The sample is bent using a Universal Testing Machine.
Analysis:
Test analysis for this type of bend testing is rather simple. Measuring the peak load that the sample was able to withstand before bending is the main criteria.
Similar Specifications:
ASTM D790 - Plastics Bend Test
ASTM D5459 - Plane Strain Bend Test