Mechanical testing machine analysis and selection method introduction

With the rapid progress of science and technology, a variety of new materials are emerging, especially polymer materials have developed rapidly in recent years. Plastic as a branch, a variety of properties have improved significantly, in some areas has been a trend to replace wood, metal materials. In order to make plastic materials and their products can be used safely and reliably, it is very necessary to carry out the performance test on them, of which the mechanical properties test is one of the most important tests.

Two test machines are described below as a reference:

1、Conventional electronic universal material testing machine

This kind of testing machine is the mainstream product of today's universal material testing machine, it uses servo motor as the power source, screw, silk mother as the executive element, to realize the speed control of the moving beam of the testing machine, it is simple to operate, the requirements of the tester are not high, the test stroke can be customized arbitrarily according to the needs of the testing machine, although the control mode is relatively single, only the speed of a kind of control mode, but the control accuracy and control range is very high and wide. Rigel test machine, for example, its speed adjustment range of up to 0.001mm/min ~ 1000mm/min, stepless speed regulation, control accuracy of up to 0.5, small tonnage models are easy to realize.If doing friction coefficient, the full-value load is only 5 N. It has great flexibility in configuration, and can be equipped with different tonnage transducers, fixtures, accessories to realize multi-purpose, complete the functions of pulling, compression, bending, shearing, peeling, tearing, coefficient of friction, torsion and so on. Throughout the plastics mechanical properties of the relevant standards, the test machine control mode requirements are almost all speed control, so whether from the control mode or speed range, test stroke and test machine tonnage, this type of model is the first choice for the mechanical properties of plastics testing.

2、Electro-hydraulic servo universal material testing machine

This type of testing machine is currently a better performance of a test machine, because it adopts electro-hydraulic servo control technology, can realize the force, displacement, deformation closed-loop control, has good control performance. Currently in the metal, building materials and other needs of constant stress, constant strain and the need for creep test occasions use more, but due to the limitations of the oil source flow, his test speed is low. In order to increase the system stiffness, to ensure the stable operation of the closed-loop control, this type of test machine stroke is small, and the operation is complex, the expansion of the configuration is more difficult, less than 10KN models, so it is not very suitable for the test of plastic and rubber materials.