Mechanical Writings

As is commonly used in industry, agriculture, research and other areas of measurement, collection, analysis and control tools and equipment, instrumentation, product applications, covering all areas of human activity. Instrument Industry in China after decades of development have formed a relatively complete product, with a certain scale of production and development capabilities of the industrial system, and electrical instrumentation, industrial measurement and test instrumentation, the field of science have a certain competitive advantage, birth of a number of enterprises with international competitiveness
Jinan KR independent research and development production of various types of testing machine has been laid in the market its own brand, company address Huaiyin District, Jinan City, the United States, Qinghe Road, Lake Industrial Park
Please contact Tel :0531 -85666029 Contact: Fax :0531 -85666025 bright
WDS-3 shear strength testing machine, tensile testing machine, elastic modulus testing machine
First, the tensile strength testing machine main purposes:
This series of tensile test machine for rubber, plastics, textiles, waterproofing materials, cable, network wire, metal wire, metal rods, metal plates and other materials, tensile test, can do to increase accompanied by compression, bending test. Digital display with test force, test speed continuously adjustable, pull off automatically shut down the sample, peak hold functions.
Tensile testing machine functions and features:
1, using high-precision, fully digital control system and precision speed reducer, Precision Ball Screw drive test, test speed to achieve a wide range of adjustment, testing process, low noise, smooth operation.
2, with cross pin universal joint structure, and function with a tilt angle limit, on the one hand to facilitate the sample holder, to ensure concentricity test, on the other hand a good sample to eliminate the irregular influence on the sensor.
3, the Touch button operation, LCD display real-time display. Display interface to display the test method selection screen, select the interface test parameters, test operation and results display and curve display interface, and convenient.
4, when the specimen clamping beams to adjust the speed of movements, with over-current, over voltage, overload protection device.
5, optional computer interface, external testing process to achieve the control computer and data storage and printing.

Second, the tensile strength testing machine Main technical indicators:
1, the maximum test force: 3000N;
2, Range: 0N-3000N;
3, the accuracy of test force; than

When we design the allowable shear stress is often taken in different circumstances with different safety factors, allowable shear stress is not the same . check all the allowable stress and allowable tensile stress is often linked, and Permissible material yield strength (stiffness) and the relationship between various stress
A stretch
Steel yield strength and the relationship between the allowable tensile stress
[Δ] = δu / n n is the safety factor
Rolling, forging n = 1.2-2.2 Lifting n = 1.7
Civil engineering human rope n = 4.5 n = 1.5
Manned by a rope threaded with n = 9 N = 1.2-1.7
General Steel Castings n = 1.6-2.5 n = 1.6-2.5

Second Cut
Allowable shear stress and the relationship between the allowable tensile stress
1 for the plastic material [τ] = 0.6-0.8 [δ]
2 For brittle materials [τ] = 0.8 - 1.0 [δ]
Three extrusion
Allowable compressive stress and the allowable tensile stress of the Relationship
1 for the plastic material [δj] = 1.5-2.5 [δ]
2 For brittle materials [δj] = 0.9-1.5 [δ]
Four reverse
Allowable stress and allowable to reverse the relationship between tensile stress:
1 for the plastic material [δn] = 0.5-0.6 [δ]
2 For brittle materials [δn] = 0.8-1.0 [δ]
Torsional axis with the twist angle of each meter to measure. Desirable for the average transmission [φ] = 0.5 ° - / m; for precision driving, it is desirable [φ] = 0.25 ° -0.5 ° / M; for the strict requirements of the shaft, [φ] can be greater than
1 ° / M calculations.
Five bending
Allowable bending stress and tensile stress relationship:
1 for the general use of thin-walled steel the allowable axial tensile stress value.
2 can be slightly higher for the solid steel, the values can be found in the relevant norms . tensile stress and yield strength of materials related to
This is my summary, we participate in the discussion about,
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