Combined Loading Compression (CLC) Test

Combined Loading Compression (CLC) Test

Each end of the specimen is fitted flush with the outside surface of the fixture block, and the four screws are then tightened to clamp the specimen between the pairs of blocks using a partially disassembled conventional CLC fixture. 

Hence, the specimen and the fixture blocks each carry a fraction of the total applied force when the assembly is loaded between flat platens. Nevertheless, shear forces at the fixture/specimen interface are ultimately required to transmit the force applied to the fixture blocks to the specimen’s central gauge section. Particles of tungsten carbide are applied to the fixture surfaces that contact the specimen ends, significantly raising the effective coefficient of friction. Only a little amount of clamping force is needed since shear force is equal to the coefficient of friction times the clamping force.

Read more: ASTM D6641 Compressive Properties (CLC)

The fundamental benefit of the test method is the combination of end loading and shear loading. The objective is to create just enough shear loading to prevent the crushing of the specimen by the end loading.

Video 01: ASTM D6641 Combined Loading Compression (CLC) Testing of CFRP

Conclusion:

The Combined Loading Compression (CLC) test is a valuable method for evaluating the mechanical properties of materials under combined loading conditions. The test involves subjecting a sample to a combination of compression and shear loading, which simulates the types of stresses that materials may experience in real-world applications. The CLC test can provide important information on a material’s strength, stiffness, and deformation behaviour under complex loading conditions.