Torsion Testing
For Soft Tissues & Biomaterials

Torsion testing applies controlled rotational deformation to a specimen to evaluate its torsional stiffness and shear response. In biomaterials research, torsion testing is especially useful for materials and tissues that experience twisting or rotational loading in vivo, including fibres, cylindrical tissues, and soft engineered constructs.

What Torsion Testing Measures

Torsion testing characterizes how materials respond to rotational loading. This form of loading is commonly referred to as torsional shear testing, as rotational deformation induces shear stress throughout the specimen cross-section.

Measurement Examples

Torsional stiffness and shear modulus
Torque versus angle response
Viscoelastic torsional behaviour
Failure under rotational loading
Coupling between axial and torsional deformation
Rate-dependent torsional mechanics
Energy dissipation during twist loading

Because torsional loading induces shear stress across the specimen, torsion testing provides complementary information to tensile and shear tests.

Torsion Testing in Biomaterials Research

Torsion testing is valuable for:

Tendons, ligaments, arteries, and engineered fibers experience combined axial and torsional loads during physiological motion that cannot be captured with tension alone.

Torsional stiffness measurements quantify shear-dominated deformation in elastomeric and compliant polymer systems. These measurements directly quantify torsional stiffness in materials dominated by shear deformation.

Flexible shafts, catheters, and implantable components often undergo twisting during insertion and in-service use.

Rotational loading can influence cellular alignment, ECM organization, and anisotropic remodeling in engineered tissues.

Torsion testing complements tensile and compression testing for a more complete description of material behaviour.

Common Sample Types for Torsion Testing

Cylindrical soft tissues
Engineered tissue fibres
Tendon and ligament samples
Polymer rods and filaments
Elastomeric fibres
Micro-scale cylindrical constructs
Flexible device components
Soft robotics filaments

How a Torsion Test Works

In torsion testing, a specimen is fixed at one end while controlled rotational displacement or torque is applied at the other, with torque and angular response recorded in real time. When applied to compliant tissues or polymers, this approach is often referred to as a biomaterial torsion test.

Twist Testing Under Displacement Control

In twist testing, a controlled angular displacement is applied while torque is measured to characterize rotational stiffness and failure behaviour.

Torque Controlled Torsion Testing

Constant torque protocols evaluate viscoelastic and time-dependent response.

Low Force Torsion Testing

Ultra soft materials and small samples require sensitive torque measurement and precise angular control. These capabilities are essential for low force torsion testing of ultra-soft tissues and micro-scale constructs.

Combined Axial and Torsional Loading

Some setups allow axial tension or compression to be applied simultaneously with torsion.

Recommended CellScale Instrument for Torsion Testing

CellScale has a dedicated system to support torsion testing with precise rotational control for characterizing torsional stiffness and shear response in soft tissues and biomaterials.

UniVert

When equipped with the torsion axis, the UniVert provides precise torsion testing capabilities for soft tissues and biomaterials. Features include independent rotational control, integrated torque and angular displacement measurement, and combined axial and torsional loading.

Relevant Research Applications

Torsion testing supports research in:

Featured Publications Using Torsion Testing

Gradually-frozen aligned bacterial nanocellulose membranes loaded with gallic acid exhibit enhanced mechanical and dual antithrombotic–antimicrobial properties

Stephens ED, Oustadi F, et al.

Biomaterials Science

UniVert

Tensile TestingTorsion Testing

Drug Screening & Drug Delivery MechanicsHydrogel Mechanical TestingInjectable & Regenerative BiomaterialsMembranes and Thin Films MechanicsPolymers and Elastomers Testing

2025