Operation process of the toughness test of the impact test machine

Impact testing machineDuring the impact toughness test, its toughness refers to samples of a certain shape and size. Samples of different thicknesses will also vary in the test operations.

The test for determining the impact load resistance of metal materials, also known as the impact toughness test. It is one of the basic test methods for material mechanical properties testing. In the impact test, the work consumed to rush the sample is called impact work, and the unit is Joule (J), expressed in Ak. Dividing Ak by the cross-sectional area F at the sample notch gives Ak/F=ak, which is joules/cm2 (J/cm2), which is called the material impact value. ak can be used to evaluate the toughness and brittleness of materials, but cannot be used directly in design calculations.

According to the sample shape and breaking method,Impact testing machineIt can be divided into three types: bending impact testing machine, torsional impact testing machine and tensile impact testing machine. Among them, the pendulum bending impact test machine is widely used and the method is simple.

1) The outer diameter of the metal material, the variable pitch and the diameter of the wire (three variables) are measured by the suspension. The metal material has achieved moldless processing. Since the development of the three-change measurement metal material, conical steel rods have been used to wind and process them on CNC lathes, but the finished product is not ideal. Now, the roll speed and pulling force must be controlled through the coil spring machine in a heating state to obtain the required cone shape, and quench it with processing waste heat.

2) Hollow stability determination metal material rods are made of low-carbon boron steel plates and are rolled and welded.

3) The torsion rod uses high-purity 45 steel, and high-frequency quenching to obtain high hardness and large residual compression stress on the surface, thereby improving fatigue life and slack resistance.

4) Metal materials used in sheet measurement for electronic products are basically formed by stamping and automatic bending. At present, it is mainly to develop the bonding technology of composite materials.

5) Valve determination Metal materials mainly develop multi-stage shot peening and liquid nitriding processes to improve the residual compressive stress on the surface and improve fatigue life.

MoreMaterial testing machineAll information is in Jinan Hengsi Shanda Instrument Co., Ltd.