Research And Application Of 100kN Mechanical Fatigue Testing Machine

For a long time,the dynamic mechanical performance test of spare parts for mechanical products such as automobiles,motor vehicles,aerospace equipment and so on has become an indispensable process in the parts manufacturing process.The purpose is to verify the mechanical properties of the parts,to ensure that the machine can withstand the workload of during its service process,to strengthen and ensure the quality of the product.So the fatigue test as the representative of the dynamic test equipment for the production of the product is not only important,and the market demand become more and more.Theoretical analysis and experiments show that the test specimens are generally working within the elastic working range,and the internal damping is small.During the period,the machine will apply the alternating load to the specimen.The Force device will work on the specimen when the machine apply the elastic force to the specimen.and in the second half-cycle of the elastic recovery,the specimen will apply force on the device work.The sum of the work of the two offset each other,showing that the fatigue load applied to the alternating load test can be done without the need to consume energy.So as long as the test equipment technical methods are properly used,even if we can not escape the use of energy,at least we can greatly save energy consumption.In this paper,100 kN mechanical fatigue testing machine system is selected for research.It will Mainly be researched from the following aspects.1)According to the requirements of fatigue testing machine at present stage,the technical scheme of 100 k N mechanical fatigue testing machine is put forward.The energy saving feasibility of the mechanical fatigue testing machine is demonstrated under four different working conditions.Aiming at the energy saving principle of the testing machine,a reasonable flywheel size is designed to meet the requirements.At the same time,bearing life of the key parts of the test machine need to be calculated to ensure that the selection is correct.2)Electro-hydraulic servo hydraulic fatigue testing machine has the characteristics of small vibration,low noise during its work.Through the analysis of vibration source of 100 k N mechanical fatigue testing machine,the solution of vibration balance is put forward,and the structure is designed according to the requirement.3)Because the fatigue testing machine is doing different tests,the required amplitude is often different.Therefore,this paper designed a reasonable set of devices,making it to achieve 0-10 mm range of continuous amplitude modulation.And the device can ensure that the test machine can achieve vibration balance at different amplitudes.In the amplitude modulation device,the size of the traction is calculated.And combined with the size of the traction,the appropriate servo motor and reducer have been selected.4)Static analysis and modal analysis of the key components of the testing machine have been done in ANSYS.Static analysis results show that the structure is safe and reliable;The modal analysis results show that the structure of the test machine in the vertical direction will not produce resonance,the natural frequency is far beyond the working frequency of the test machine.5)Aiming at the connection between the column and the moving beam of the fatigue testing machine,the prestressed elastic clamping technology of the moving beam is put forward.The required interference is calculated and analyzed by HYPERMESH and ANSYS software.It is proved that the interference is completely reasonable and meets the actual clamping requirements.The amount of eccentricity required for the cross beam and the column is calculated by the finite element software,ensures that the movable beam can freely rise and fall on the column.