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Bending test fixtures are used to transform the ELF and Instron fatigue testers' axial or rotary motions into various types of bending motions or motions that mix bending and other actions. Measurements Technology, Inc. has created a variety of bending test fixtures for this purpose, all of which are based on the primary purpose of the test. These fixtures are made to hold a statistically significant number of specimens and are frequently adjusted to fulfill the test requirements for the customer's device design. To produce physiologically appropriate environmental conditions, all of these test setups can be used with PBS baths or fluid flow. The following list of bending test fixtures includes descriptions of the types of bending tests performed.

Pure bending test fixtures

Pure bending test fixtures apply a bending moment to the device's proximal and distal ends, resulting in a pure bending configuration at the device's center.

Cantilevered bending test fixtures

With cantilevered bend test fixtures the proximal end of the specimen is fixed while the distal end is subjected to an orthogonal displacement. As a result, the device's part near the fixed end bends.

Combined cantilevered/pure bend test fixture

The proximal end of the specimen is fixed while the distal end is moved through an arc with a fixed radius in the combined cantilevered/pure bending test fixture. Because it mimics the wagging of a tail, this test is commonly referred to as the "wag" test. The specimen can either "find" its own radius of curvature or be wrapped around a mandrel of known radius.

Constant radius bending test fixtures

Constant radius bending fixtures with a constant radius is designed to apply a bending moment at a specific radius. "Bending on a Mandrel" is a term used to describe this type of testing. The proximal end of the specimen is fixed with this method, while the distal end of the specimen is moved in an arc. The specimen is bent over a predetermined radius mandrel to ensure that the bend has a constant radius. This test can be used to generate predictable positive and compressive stresses.

Compression bending test fixtures

Compression bending test fixtures apply axial motions to the distal and proximal ends of an omega (or "inch-worm") preformed device. The radius of the specimen bend decreases as the ends are brought together. In contrast to pure bending, which produces only one bend radius, the compression bend fixture produces three bend radii (distal, center, proximal).

Shear induced bending test fixtures

Shear induced bending test fixtures apply a shear motion to one or both ends of the specimen, causing the device to bend and shear. Based on the applied motions, the specimen is usually permitted to discover its own radius of curvature.

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