Bend testing is a simple and inexpensive test to evaluate or compare materials, and can easily be used as part of quality control on the production floor. It also goes under the name “a poor man’s tensile test”.
Usage of Bend Test
The bend test is commonly used to test welding’s, and that they are properly fused with the other material. It is also used to determine the strength of a material and measures the ductility, how well it change shape under pressure and keep the shape.
Bend Test Setup
Bend tests can be designed to stretch the outer material similar to what would be the minimum requirement in a tensile test. If tearing of material is seen, the sample will be considered failed.
There are a few different types of bend testing that can be used as outlined below.
- Guided-Bend Test: This is where the specimen is wrapped around a former with a defined size, and is the type of test used for welding’s. The sample is bend into a U shape.
- Semi Guided Bend Test: The samples are placed horizontally across two supports and bend into a specific angle.
- Free Bend Test: In this test the sample s pushed from both ends, but there is no guides affecting the bend direction.
Materials used for Bend Testing
The test is most commonly used on metals, but can be used on any material subject to plastic deformation. Bend test usually used for highly ductile materials, and the sample will have a tensile force on the outside of the bend and compression force on the inside.
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