Main body and dynamometer of the hottest shoe mate

2022-07-25
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The main body and dynamometer of the shoe material tensile testing machine

the main body and dynamometer of the shoe material tensile testing machine

Dongguan Haida Instrument Co., Ltd./

the main body and dynamometer of the tensile testing machine shall be installed on the concrete foundation. The foundation size shall be determined according to the shape and foundation drawing, and the anchor screw, lower jaw screw rod hole and other wire installation pipes and other devices shall be reserved

the tensile testing machine shall be installed in a clean, dry, shock free room with a room temperature of 20 ℃ +/-10 ℃. It is noted that sufficient free area shall be reserved near the testing machine for beam bending test, test with extensometer and equipment maintenance

the upper plane of the foundation shall be flat. The third largest market is to align with the traffic level. After the foundation is dry, install the tensile testing machine

the tensile speed of tensile testing machine mainly affects the tensile speed, elongation after fracture and yield strength. The influence of the tensile speed testing machine varies with different materials. Therefore, the tensile test must be carried out in strict accordance with the speed specified by the scale test method. Whether the sheet metal is seriously deformed due to bumps and collisions in the journey will affect the correctness of the test results

elongation after fracture: the improvement of tensile speed makes the elongation after fracture decrease, and the elongation after fracture tends to decrease slowly when the total weight is about 40000 tons. (in addition, the tensile strength and elongation after fracture with high plasticity are more sensitive to tensile speed, while the tensile strength and elongation after fracture with low plasticity are less sensitive to tensile speed.) Mooney viscometer aging test chamber freezing trimming machine

tensile strength: the tensile strength increases with the increase of test speed, but tends to be stable after reaching a certain stage. Rubber tensile testing machine

yield strength: when the test speed is slow, the difference between yield strength and tensile strength is relatively large; The faster the test speed is, the smaller the difference between yield strength and tensile strength is. Generally, the influence of the change of tensile speed on the test results is as above, but for plastic materials, it belongs to viscoelastic materials, and its stress relaxation process is closely related to the deformation speed. When the tensile speed decreases, the tensile strength decreases and the elongation at break increases; When the tensile speed increases, the plastic shows brittleness, the tensile strength increases, and the elongation at break decreases. For the verification of the tensile testing machine, it should be in strict accordance with the requirements of the verification regulations. First, it should be pre tensioned and pressed for 3 times under the maximum test force, and then the force value should be verified. Do not try to save time and reduce the times of pre stretching and pressing. At the same time, it is necessary to carefully observe whether the change of the verification indication at each verification point is regular, and analyze its causes to avoid misjudgment

at present, the quality of tensile testing machines varies greatly, and some newly delivered tensile testing machines will also have the above problems. Therefore, it is suggested that a half year verification cycle speech should be given for the tensile testing machine that is qualified after initial verification and adjustment. After half a year, the verification cycle of the qualified tensile testing machine can be restored to one year. In this way, we can not only investigate its long-term stability, but also its indication changes in different seasons

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