Torsion Testing Machine
NWS series Torsion Testing Machine
NWS series Torsion Testing Machine
It can be used for torsional mechanical performance testing of metal, non-metal, composite materials and components. Tests such as torsional failure, torsional shear modulus, and multi-step torque loading test. Equipped with a torsion angle mete, it can measure shear modulus and specify non proportional torsional stress.
Model: NWS series
Chinese standard:
GB/T 10128-2007 “Metallic materials – Torsion test at ambient temperature “
HB7595-2011 “General specification for nuts, self-locking, with maximum operating temperature less than or equal to 425℃”
International standard:
ISO 7800 “Metallic materials — Wire — Simple torsion test “
American standard:
ASTM E143 “Standard Test Method forShear Modulus at Room Temperature”
Application
Mechanical components: Evaluate the safety performance of torque bearing components such as axles, drill rods, and transmission shafts
Material R&D: determination of shear modulus and plastic deformation ability of new alloy materials
Quality inspection: Verify whether the torsional strength of standard components such as springs and bolts meets the design requirements
Construction engineering: Testing the torsional stability of metal materials (such as shafts, springs, etc.)
Feature
Technical parameter
- Maximum torque: 500 / 1000 / 2000 / 5000 / 80000N.m
- Torque measurement range: 1% – 100% FS
- Torque measurement accuracy: ≤ 0.5%
- Torque measurement resolution: 19 bits (500000 yards)
- Torsion angle display accuracy: ± 0.5%
- Torsion angle measurement resolution: 0.0002 degree
- Torsion angle measurement range: 0-10000 degrees
- Elastic parameter: Shear Modulus reflects the ability of a material to resist elastic torsional deformation, calculated through the initial linear segment of the torque torsion angle curve.
- Strength parameter: including Proportional Ultimate Torque (specified non proportional torsional stress), Yield Torque (torque corresponding to 0.3% residual shear strain), and Torsional Strength (Max. torque)
- Plastic parameter: The Total Torsion Angle at fracture characterizes the plastic deformation ability of materials. Brittle materials are usually less than 20 °, while plastic materials can reach several hundred degrees.
What is torsion test？
The torsion test is a mechanical property testing method that determines the resistance of materials to torsional deformation and fracture by applying torque. It belongs to the basic method of material mechanical property testing.
This test can determine core parameters such as shear modulus of elasticity, yield strength, and torsional strength, and is suitable for quality assessment of torque bearing components such as metal materials (such as steel and aluminum alloys), mechanical parts (shafts, springs), and building materials.
During the test, the mechanical response of the material in the elastic and plastic stages was obtained by analyzing the torque torsion angle curve, and the failure mode of the material was determined based on the fracture morphology (plastic material fractured perpendicular to the axis, brittle material in a 45 ° spiral shape)
Fracture analysis
Correlation between fracture characteristics and material properties:
Plastic material: The fracture surface is flat and perpendicular to the axis of the specimen (cutting type fracture), accompanied by obvious plastic deformation rings.
Brittle material: 45 ° spiral fracture (normal fracture type), failure dominated by axial tensile stress.
Composite failure: Layered fracture indicates material anisotropy or surface treatment defects.
Fracture analysis can identify defects in heat treatment processes (such as quenching cracks) and issues with material purity.
Industrial application
In many engineering fields such as machinery, petroleum, metallurgy, etc., many mechanical components are subjected to torsional loads, such as motor spindles, machine tool spindles, automotive transmission shafts, petroleum drill rods, and various springs.
The performance of these components is directly related to the safe operation and service life of the equipment. Therefore, it is necessary to accurately measure the torsional performance indicators of their related materials to provide scientific basis for design and material selection.
As an important method for testing the mechanical properties of materials, torsion testing plays a crucial role.
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