The Leeb hardness testing technology is a newly developed technology following the Brinell, Rockweel, Vickers, and Shore hardness. The Leeb hardness tester manufactured according to the Leeb hardness theory has changed the traditional hardness testing method. Since the hardness sensor is as small as a pen, it can directly test the hardness of the workpiece in various directions on the production site by holding the sensor, so it is difficult for other desktop hardness testers.
What is the Leeb hardness
The concept of Leeb hardness was proposed by Dr. Dietmar Leeb of Switzerland, which is a dynamic hardness test method. During the impact process of the impact body of the hardness sensor with the measured workpiece, the ratio of the rebound speed to the impact speed when it is 1mm away from the surface of the workpiece is multiplied by 1000, which is defined as the Leeb hardness value. The Leeb hardness is expressed in HL. The formula is as follows:
HL=Vb/Va×1000
Vb: indicates the rebound speed
Va: means impact velocity
Characteristics of the Leeb Hardness Tester
Both Shore and Leeb hardness are adopting dynamic load test methods, but Shore examines the vertical height of the rebound of the impact body, so it is determined that the Shore hardness tester should be used vertically downwards, which is limited in some applications. However, the Leeb hardness is different. The Leeb hardness tester examines the speed of the rebound and impact of the impact body. With the speed correction, it can be used in any direction, which greatly facilitates the user.
Commonly used Brinell, Rockwell and Vickers hardness testers. Due to its large size, it is inconvenient to use in the field, especially when large and heavy workpieces need to be tested. Since the benchtop hardness testers cannot accommodate it, it cannot be detected at all. The Leeb hardness tester does not require a workbench, and its hardness sensor is as small as a pen, which can be directly operated by hand. It can easily detect whether it is a large, heavy workpiece or a workpiece with complex geometric dimensions.
Factors Related to Leeb Hardness
Since the Leeb hardness test method is a dynamic load test method, the Leeb hardness value must be related to the elastic modulus E of the metal material. The elastic modulus corresponding to different materials is also different, so the Leeb hardness tester is classified and tested according to the type of material.
Conversion of Leeb Hardness and Other Hardness
There is a corresponding relationship between the Leeb hardness value and other hardness values (HRC, HRB, HB, HV, HSD). Therefore, the Leeb value (HL) can be converted into other hardness values. The Leeb hardness tester can be automatically converted by the built-in microcomputer.
Classification and Comparison of Leeb Hardness and Other Hardnesses and Testing Requirements
From the perspective of microscopic deformation, the Brinell, Rockwell and Vickers hardness examines the plastic deformation of the material, which is expressed as the size or depth of the indentation; the Leed and Shore hardness examines the elastic deformation of the material, which is expressed as the size of the rebound speed or the depth of the indentation.
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