Abstract
In the material strength test, stress and strain rate are often required to be constant. For example, during the cement quali ty inspection, the loading rate is required to be2.4 ± 0.2KN/S (1); when measuring the upper and lower yielding points of metallic materials, the stain rate should stay between 0.00025/S and 0.0025/S; In the determination of elongation at break, the stress rate should stay in the r ange of 1-10N/mm 2 S -1 when the elasticity modulus smaller than 150000 N/mm2 (2). Since 1950s, Material Testing Machines, which adopted large-flow electro- hydraulic servo, valve to form control system, have appeared in developed countries. Control system of this type could meet the requirements for the stress and strain rate in the material strength test. For example, MTS and Instron from USA, Schench from German, and Shimadzu from Japan all adopted this type of system. With the improvement of the manufacturing level of proportional valve and the development of control technology, electro-hydraulic proportional valve began to be used as the main control part home and abroad (4). However, this type of parts, which is vulnerable to pollution, requires medium of high cleanliness. It is of large noise and high price. This type of system could go wrong easily for the complex hydraulic system. Universal Testing Machine is used for several advanced applications like checking tensile as well as compressive strength of materials to be used to build any kind of physical system .Based on this proposes a simple and effective control system, which has a good control effect upon stress rate and strain rate in the application of engineering practice .This type of system can be used in various strength testing device. Test and inspection show that this system, which totally meets the loading requirements of stress rate or strain rate in the national standards, can be used in hydraulic testing machines (7). The new compact touch screen panel has been presented and implemented successfully by embedded system technology with the current system. So that the most advanced touch screen panel provide clear analytical treatment for load v/s elongation curves, values of stress & strain coming from different channels. The touch screen should also be well- suited in terms of cost, size, smoothness and ease of integration in the circuit boards of measuring devices. II. Methodology:
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