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Vertical Double-shaft Four-cylinder Electro-hydrac Suliervo Testing Machine
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Vertical-axis servo-cylinder testing machine, belonging to engineering materials, physical properties, structural deformation and mechanical experiments technical fields. The invention uses a direct two-way hydraulic drive stress field. Four-cylinder drive to achieve arbitrary load path, there is poor closed-loop servo control system ensures synchronization and symmetric load; each set of servo drive can be achieved through a slow and fast moving state experiments; equipped to achieve sine wave, triangle, square, ramp, combination wave function generator to produce the corresponding experimental waveforms loaded; through bit transmission device to facilitate the installation of the specimen; through the guide plate and the linear guides ensure concentricity and avoid horizontal chuck due weight caused by bending; able to complete the testing machine biaxial tension, compression, but also complete dynamic fatigue biaxial mechanical experiments. Throughout the experiment using computer control, easy and convenient. 22736
TECHNOLOGY
The present invention relates to a vertical axis servo testing machine cylinder, are engineering materials, physical properties, structure and mechanical deformation experiment technology. It can be used to test materials, especially biaxially anisotropic composite material to withstand the tension, compression, mechanical properties and fatigue loads.
BACKGROUND
With lightweight composite materials in various industrial fields more and more widely, the urgent need to complete the biaxial anisotropic material to withstand tensile, compression and fatigue loads mechanical experiments. This is because a practical point of view, the composite material generally bear the load in multiple directions; And from anisotropic theory, the multi-axis load state, the stress distribution is very complex, the conventional single-axis mechanical experiments can not provide sufficient material requires the effective application of the anisotropic material properties and experimental data.
Currently, there are a variety of domestic and international biaxial testing machine, load games from joy to the realization of view, there are two ways - one is through the thin-walled tube joint load in tension-torsion biaxial stress field within the material cause ( Experimental mechanics, 23, 384-392, 1983), this method is relatively simple, but the load path is limited, and the stress field is approximate way, can not be applied to the sheet of material; Another way is to direct two-way stress field. In this two-way direct drive system stress field of view, there are basically three ways: one is through a set of weights and a lever system in the realization of driving G. Strain Analysis, 8 (2), 119-123, 1973), This drive system due to the constant load time for the completion of the experiment becomes Ru, but need to overcome a large frictional force, and it is difficult to load a wide load and deformation; one is by a drive motor and the clutch matches ( CN 1013809B), such a motor-driven approach, easy to implement synchronization and symmetric load, but due to the device geometry constraints, and can not achieve a variety of biaxial loading path, and invented a device patent CN 1013809B only Tensile tests done; there is a half-motor drive system through the four double-acting drive and feedback system to achieve biaxial loading, (Experimental mechanics, 34, 1-9, 1994) in each set has a DC motor drive system and an AC motor, respectively, to achieve experiment status slow and fast moving state, to complete any quasi-static loading and compression ratio of biaxial stretching experiments, but it does not achieve biaxial dynamic fatigue test under a load, and its fast-moving state is not synchronized feedback through LVDT values �6�7�6�7to determine the specimen holder center to install the specimen caused trouble by suspending weights to avoid horizontal loading device bending caused due weight.