Torsion Testing Machine

NWS series Torsion Testing Machine

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NWS series Torsion Testing Machine for Materials and Components

Specifically, SINOTEST torsion testing systems are designed to evaluate the torsional mechanical performance of metal, non-metal, composite materials, and structural components. For example, these systems perform torsional failure tests, torsional shear modulus determination, and multi-step torque loading tests. Equipped with a torsion angle meter, they can also accurately measure shear modulus and specify non-proportional torsional stress limits. Consequently, engineers and quality control professionals rely on our torsion testers for material development and component validation.

Model: NWS series

Standards Compliance

To ensure international compatibility, SINOTEST torsion testing systems comply with multiple global standards. These include Chinese standard GB/T 10128-2007 “Metallic materials – Torsion test at ambient temperature,” HB7595-2011 for self-locking nuts with maximum operating temperature ≤ 425 ℃, and American standard ASTM E143 “Standard Test Method for Shear Modulus at Room Temperature.” Furthermore, the systems meet ISO 7800 “Metallic materials — Wire — Simple torsion test” requirements. Therefore, users can confidently conduct tests according to internationally recognized testing protocols.

Application Areas

First, for mechanical components, SINOTEST torsion systems evaluate the safety performance of torque-bearing components such as axles, drill rods, and transmission shafts. Second, in material R&D, they determine shear modulus and plastic deformation ability of new alloy materials. Third, in quality inspection, these systems verify whether the torsional strength of standard components such as springs and bolts meets design requirements. Finally, in construction engineering, our torsion testers assess the torsional stability of metal materials, including shafts, springs, and structural fasteners.

Feature

Technical parameter

The NWS series torsion testing machine offers the following technical specifications:

Maximum Torque: 500 / 1000 / 2000 / 5000 / 80000 N·m
Torque Measurement Range: 1% – 100% FS
Torque Measurement Accuracy: ≤ 0.5%
Torque Measurement Resolution: 19 bits (500,000 divisions)
Torsion Angle Display Accuracy: ± 0.5%
Torsion Angle Measurement Resolution: 0.0002°
Torsion Angle Measurement Range: 0–10,000°

In addition to these core parameters, the system calculates three critical material properties:

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: This includes Proportional Ultimate Torque (specified non-proportional torsional stress), Yield Torque (torque corresponding to 0.3% residual shear strain), and Torsional Strength (maximum torque).
Plastic Parameter: The Total Torsion Angle at fracture characterizes the plastic deformation ability of materials. Typically, brittle materials show total torsion angles less than 20°, while plastic materials can reach several hundred degrees.

What is torsion test？

Fundamentally, a torsion test is a mechanical property testing method that determines the resistance of materials to torsional deformation and fracture by applying torque. As one of the basic methods of material mechanical property testing, this test can determine core parameters such as shear modulus of elasticity, yield strength, and torsional strength. For this reason, it is suitable for quality assessment of torque-bearing components including metal materials (such as steel and aluminum alloys), mechanical parts (shafts, springs), and building materials.

During the test, operators analyze the mechanical response of the material in the elastic and plastic stages by examining the torque-torsion angle curve. Based on the fracture morphology, they can determine the material’s failure mode. For instance, plastic materials fracture perpendicular to the axis (cutting-type fracture) with obvious plastic deformation rings, while brittle materials exhibit a 45° spiral fracture (normal fracture type) dominated by axial tensile stress. In cases of composite failure, layered fracture indicates material anisotropy or surface treatment defects. Additionally, fracture analysis can identify defects in heat treatment processes, such as quenching cracks, and issues with material purity.

Industrial Applications

Notably, in many engineering fields — including machinery, petroleum, and metallurgy — numerous mechanical components are subjected to torsional loads. Examples include motor spindles, machine tool spindles, automotive drive shafts, drill pipes, and torsion springs. Consequently, SINOTEST torsion testing systems are essential for quality assurance and material certification across these industries. For specific applications, customized testing configurations are available to meet unique torque, angle, and speed requirements.