FYI Tester Instrument

  An extensometer is an instrument that measures line deformation between two points on components and other objects. The main equipment used in tensile testing includes testing machines and extensometers. The testing machine is a system that applies tensile testing force to the sample, and controls and measures it; the extensometer is a system that measures the extension (or displacement) of the sample. During the testing of material mechanical properties, stress and strain are interdependent. Any material, as long as it is subjected to stress, will definitely produce strain; as long as it produces strain, it must be subject to stress. Mechanical extensometer Mechanical extensometers are mainly ball hinge extensometers. Due to its simple structure and easy operation, it is still widely used in tensile property testing. This instrument is mounted on the specimen through 4 top screws (one top screw at the front and one at the front at positions C and D). When the gauge length l of the s

  Definition Snagging refers to the yarn or fiber in the fabric being hooked or broken by sharp objects, forming loops, fiber (bunch) loops, fluff or other uneven defects floating on the surface of the fabric. The snagging resistance of fabrics is particularly important for fabrics with looser structures, especially knitted outerwear fabrics, filament fabrics and fabrics with long floating lines. Factors affecting the snagging performance of fabrics Fiber properties Compared with non-circular cross-section fibers, circular cross-section fibers are more likely to snag. Compared with short fibers, filaments are easier to snag. When the fiber has high strength and long elongation, the snagging phenomenon is obvious; when the fiber elongation is small and the elasticity is high, snagging can be alleviated and eliminated through elastic retraction. When the fabric is pulled by sharp objects from the outside, fibers or yarns with better elasticity can alleviate the external force through the

  What is fabric abrasion resistance Fabric abrasion resistance refers to the fabric’s resistance to wear and tear. Abrasion refers to the phenomenon that fabrics are gradually damaged due to repeated friction from other objects during use. The abrasion resistance of a fabric is mainly measured by its number of flat wears. When the yarn structure, yarn number and density of the fabric are the same, the number of flat grinding times is closely related to the friction support area of the fabric. That is, the larger the friction support area, the higher the number of flat grinding times. When using instruments to measure the abrasion resistance of fabrics in the laboratory, instruments are used to simulate various wear conditions of the fabrics in actual wear. Wear mainly includes the following types:  (1) Flat wear: The fabric is subject to reciprocating or rotating plane friction, such as the wear under the sleeves of clothes, the buttocks of trousers, and the bottom of socks. (2) Bend

  The rotational viscometer is a digital viscometer. The motor drives the rotor to rotate at a constant speed through variable speed. The casing of the motor is mounted in a suspended manner, and it drives the drum to rotate through the rotating shaft. When the drum rotates in the liquid to be measured, it receives viscous resistance, which generates a reaction force to deflect the motor housing. The motor housing is connected to two metal hairsprings, one installed in front and one in reverse. The rotation of the housing causes the hairsprings to generate torque. When the balance of the hairspring’s torque and the viscous resistance torque is reached, the pointer connected to the motor housing points out a certain value on the dial, which is proportional to the viscous resistance of the rotating drum. The scale reading multiplied by the drum factor then represents the magnitude of the dynamic viscosity. Rotor of rotational viscometer When the rotor rotates in the liquid, the liquid wi