The test method for conducting the test usually involves a specified test fixture on a universal testing machine. Details of the test preparation, conditioning, and conduct affect the test results. The sample is placed on two supporting pins a set distance apart. 3 Points 4 Point Bending Strength Testing is most frequently employed, in which a specimen having either a circular or rectangular cross-section is bent until fracture or yielding using a three point flexural test technique. The flexural strength represents the highest stress experienced within the material at its moment of yield.

Purpose of Bending Testing

Bend testing a material allows for the determination of that materials ductility, bend strength, fracture strength and resistance to fracture. If a material begins to fracture or completely fractures during a three or four point bend test it is valid to assume that the material will fail under a similar in any application, which may lead to catastrophic failure. Our 3 Points 4 Point Bending Strength Testing Machine can fully achieve this purpose. These characteristics can be used to determine whether a material will fail under pressure and are especially important in any construction process involving ductile materials loaded with bending forces.

Common Bending Testing Method

There are four common types of bend tests. In a guided bend test, the sample is placed horizontally across two supports and then a force applied to the top of the midpoint deforming the sample into a “U” shape. Finally, a common fracture toughness test consists of a sample with a pre cracked starter crack on the bottom side of the midpoint which is loaded into a 3-point bend fixture so that the midpoint force is applied on the opposite face from the fracture. In a semi-guided bend test, the specimen’s midpoint is bent to a specific angle or inside radius. In a free bend test, the ends of the sample are pushed together, but no force is applied to the bend itself. 

Main features of 3 Point 4 Point Bending Strength Testing Machine

Whole facility structure is made of baking varnish aluminum profile, and inner part is applied the high-accuracy, low-resistance and zero clearance of dual-ball screw and oriented pole,  through which highly improve the loading efficience and structure rigidity.

Graph scale automatic optimization allows best measurement and can implement graphics dynamic switching by the test.

Use famous brand Panasonic servo motor, which ensure high efficiency, steady transmission and low noise.

Apply computer as the main control system, computer control with software, back to origin automatically after the test, and can store data automatically or by manual operation 

Data transmission: RS232, and displacement resolution: 0.001mm