DE-MATTIA FLEX TESTER
DE-MATTIA FLEX TESTER
The De Mattia Flex Tester has a set of grips to hold test specimens in two t iers with their holding faces lying in the same vertical plane. Holding one end of the test specimen in a fixed grip and the other end in a reciprocating grip provides the flexing and unflexing action. The set of grip has two-fixed grip and one large reciprocating grip positioned between them in order to flex half of the test specimen while the other half is being unflexed.
The reciprocating grip is slide on hardened and ground rods made of high carbon steel. The reciprocating motion.
is provided by an eccentric and linkage mechanism driven by an electric motor through V-belt and pulleys. A six digits electronic counter is provided for indicating the number of the test cycles undergone.
The reciprocating grip is slide on hardened and ground rods made of high carbon steel. The reciprocating motion.
is provided by an eccentric and linkage mechanism driven by an electric motor through V-belt and pulleys. A six digits electronic counter is provided for indicating the number of the test cycles undergone.
SHEAR FATIGUE TESTER FOR PU FOAM
The ability of polyurethane foam slabs to withstand the effect of repeated compressions is determined with the help of a shear fatigue test. In this test, test specimen in shape of a square block is held over a flat reciprocating platform and is pressed down from the top by a horizontal cylindrical roller inclined at an angle of 15° to the direction of motion of the platform. The platform is moved for a specified number of cycles and the effect of repeated compressions produced on the test specimen is evaluated by finding the change in its thickness and indentation hardness index. The Shear Fatigue Tester for polyurethane foam consists of a reciprocating platform on which the test specimen can be held, a cylindrical roller to compress the test specimen, and an arrangement to either produce a constant deflection of the test specimen or to apply a constant load on it.
The reciprocating platform is made of cast aluminum and is moved in a horizontal plane with the help of a motor, worm reduction gearbox, and a link. It moves on four wheels having ball bearings. The wheels run on two metallic r ails. The platform has a large number of holes on its upper surface for rapid escape of air during compression. The test specimen is held on the platform with the help of either a double-sided adhesive tape or by holding fabric strips pasted on its ends under two bar shaped grips. The cylindrical roller is made of stainless steel and rests on the surface of the test specimen. Its axis is inclined at 15° to the direction of motion of the platform. The roller is mounted on two ball bearings and is held on the ends of two levers to permit a hinged vertical movement. The desired deflection is given by placing dead weights above the cylindrical roller. Test under constant deflection are conducted by restricting the vertical movement of the roller with the help of two adjustable knurled bolts. Tests under constant load are conducted by placing desired dead weights above the roller. A five-digit pre-set type electronic counter with non-volatile memory is provided to record the number of compressions of the test specimen and to automatically stop the motor after the desired number of compressions. The apparatus is finished in blue metallic painting and bright chrome / zinc plating to give it a corrosion resistant finish.
TENSILE STRENGTH TESTER-COMPUTERIZED
Tensile strength and elongation are the two prime characteristics of most of the raw materials, whether they ar e metals: or non-metals: such as rubber, textiles, plastic, paper: or finished products such as rods, wires, ropes, yarns, belts etcetera. These properties very often play the major role in determining the suitability of any raw material for any specific application. It is therefore, of utmost importance to determine these characteristics accurately, conveniently, and quickly. The “TENSILE STRENGTH TESTER provide a relatively inexpensive way for determining the Tensile & Elongation of sample. They are based on constant rate of traverse principle in which one end of the test specimen is held in a stationary grip, while the other end is made to move at a known fixed speed with the help of motor, gearbox and screw arrangement. The load exerted on the stationary grip is sensed by a load cell and
indicated by a digital load indicator. The controller is microprocessor based and has the facility of over load protection, peak hold and auto calibration. The load directly indicated in kilograms or Newton. The elongation of the test specimen is measured on a digital indicator fixed on the frame of the tester, which indicates the distance between the grips. We provide the Window based software which give the different measurement parameter and the graph between load vs elongation. The report can be printout by using proper printer. Various built-in safety arrangements such as over-travel protection are provided. The tester is finished in metallic painting and bright chrome| zinc plating to give the apparatus a corrosion resistant finish. It is supplied complied which electrical Which include micro-, switches, Push buttons, and contactors for safe and convenient operation
INDENTATION HARDNESS TESTER FOR PU –FOAM
The feel of softness of any flexible foam is quantitatively defined by its indentation hardness. Indentation hardness of foam is determined by pressing a circular indentor at a specified speed against a block of foam and finding the force needed to compress it to a specified percentage of its initial thickness. The Indentation Hardness Tester for polyurethane foam consists of a circular indentor which can be pressed against the foam block under test, a motorized arrangement to move the indentor, and a load indicating arrangement to indicate the load being exerted by the indentor on the foam block at any instant. The indentor is in shape of a circular disc and is mounted on a self-aligning ball bearing to ensure that it sits parallel to the surface of the test specimen. It is mounted at the lower end of a screw, which can be raised or lowered at a specified speed with the help of a motor and worm reduction gearbox. An arrangement to stop the motor at extreme ends of travel of the indentor is provided. The downwards movement of the indentor is measured with the help of a pre-set type digital displacement meter, which can be set at any desired value to stop the motor automatically at a desired displacement.
A linear scale is provided to indicate the gap between the bottom face of the indentor and the loading platform. The indentor can also be moved by hand to apply the initial load. The load platform is made of cast aluminium and has a large number of holes arranged in a grid for rapid escape of air during compression. It is mounted on shear beam type load cell. A digital load indicator is provided to indicate the load acting on the test specimen. The equipment is finished in blue metallic painting and bright chrome / zinc plating to give it a corrosion resistant finish.