FIXED-SPAN LONG BEAM FLEXURE
TEST FIXTURE  (ASTM C 393)

 Special Model No. CU-LF (aluminum and low carbon steel)

Fixed-Span Long Beam Flexure Fixture
(Three- and Four-Point Loading)
Shown with a Wide Array of Optional Loading Heads and Supports mounted on fixture: round and flat supports & four-point loading lower left: flat and large round supports lower center: four small diameter loading and support cylinders right center: three-point loading head with flat lower right: wide flats with various centering stops

This is a specialized version of the standard Long Beam Flexure Fixture (see the previous section of this catalog), with alignment rods and linear bearings. Rather than being fully adjustable, it is designed for specific loading and support spans. This is sometimes desired in testing environments such as production quality control, to insure that the proper spans are consistently being used.

Typically, up to three different spans can be specified by the customer, up to a maximum of 24". The maximum specimen width can also be specified, being typically between 2" and 6". As suggested in the above photograph, loading and support pads of any practical configuration can be provided. Built-in stops to center specimens of various widths can also be provided.

This fixture is fabricated of aluminum and steel, to minimize fixture weight.

In use, the fixture can be loaded directly on the top loading plate, or preferably through an optional adapter such as shown, attached to the cross head of the testing machine. For this purpose, a standard 1.25" diameter male stud with a 0.50" diameter cross-pin hole is provided with the fixture. The fixture base rests unconstrained on the base of the testing machine.