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4 point bend fixtures

4 point bend fixtures

The four point bending flexural test provides values for the modulus of elasticity in bending, flexural stress ,flexural strain and the flexural stress-strain response of the material. This test is very similar to the three point bending flexural test. The major difference being that the addition of a 4th bearing brings a much larger portion of the beam to the maximum stress, as opposed to only the material right under the central bearing.

This difference is of prime importance when studying brittle materials, where the number and severity of flaws exposed to the maximum stress is directly related to the flexural strength and crack initiation.

General introduction

The four point bending flexural test provides values for the modulus of elasticity in bending, flexural stress ,flexural strain and the flexural stress-strain response of the material. This test is very similar to the three point bending flexural test. The major difference being that the addition of a 4th bearing brings a much larger portion of the beam to the maximum stress, as opposed to only the material right under the central bearing.

This difference is of prime importance when studying brittle materials, where the number and severity of flaws exposed to the maximum stress is directly related to the flexural strength and crack initiation.

It is one of the most widely used apparatus to characterize fatigue and flexural stiffness of asphalt mixtures.

Four point flexural testing fixtures have two base supports and two top loading points. There are two types of 4 point bend tests based on where the load contact points are on the sample. The first type divides the sample into three parts and the loading points are placed at 1/3(L) apart. The second test splits the sample into four parts and the two top points are at 1/4(L) and 3/4(L).

4 point bend fixtures

Standard

EN 14509 Test Methods of Self-supporting double skin metal faced insulating roofing sandwich panel –

EN 14509 specifies factory-made self-supporting double-skin metal-faced insulating sandwich panels for roofs, external walls, internal walls/ceilings.  Mechanical property tests include shear strength and modulus, compressive strength or stress, shear strength under long-term load, tensile strength, bending bearing capacity, and wrinkle pressure.

ASTM F1264 Intramedullary Fixation Device Torsion & Bend Fatigue Test –

ASTM F1264 is a standard specification used to describe the design and mechanical function of intramedullary fixation devices (IMFDs). This specification covers IMFDs used for surgical fixation of the skeletal system. In addition to classification, terminology, labeling, and material specifications, it also includes four standard testing methods: 

1, static four point bending test method (Annex A1), 

2, static torsion test method (Annex A2), 

3, bending fatigue test method (Annex A3), 

4, bending fatigue test method for IMFD locking screws (Annex A4). 


The UTDS series Dynamic/Fatigue Testing machine used for bone needle,  bending intramedullary nail fatigue test is mainly used for biomechanical performance testing of various materials, including artificial blood vessels, soft tissues, bones, bone plates, and vertebrae Interfusion device, knee joint, spine Dynamic and static mechanical tests on materials such as column fixators, metal coatings, hip joints, and intramedullary nails, including tension, compression, bending, and torsion.

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