ISO 527-4

Tensile testing of isotropic and orthotropic non-unidirectional fibre-reinforced composites per ISO 527-4, is used to determine mechanical material property data. Uniaxial tensile force is applied to a flat test specimen to investigate the stress/strain behavior and critical materials properties including tensile modulus, tensile strength, elongation at break, and Poisson’s ratio. Composite materials addressed by the standard include non-unidirectional fibre-reinforced thermosetting and thermoplastic which include glass fibres, carbon fibres, and aramid fibres as reinforcement.

 

The tensile test is performed by placing a test specimen in the grips of either a servohydraulic or an electromechanical testing machine and subjecting the specimen to controlled tension load until failure. The specimen response can be measured with a contacting or non-contacting extensometer, or strain gages. ISO 527-5 is another commonly used standard for tensile testing of unidirectional fibre-reinforced composites.

 

Solutions for ISO 527-4 typically include these types of components:

 

The MTS Landmark servohydraulic test systems and MTS Criterion electromechanical universal test systems are ideal for performing accurate and repeatable monotonic testing of fibre-reinforced plastics per ISO 527-4.

 

The MTS Landmark system’s innovative test frame design exhibits superior stiffness and alignment capabilities. The test system integrates the latest MTS servohydraulic technology including precision-machined columns for consistently tight alignment, fatigue-rated MTS actuators with low-friction bearings, smooth-ramping hydraulic service manifolds, and SilentFlo™ hydraulic power units that are quiet enough to be located directly in the laboratory.

 

The compact MTS Criterion test system features high-resolution MTS digital controls, linear motion guides for superior alignment, high-speed, low vibration MTS electromechanical drives, optional Dual Zone test space for maximizing efficiency and anti-rotation grip/fixture mounting to minimize shear stresses on the specimen.