ASTM D3518

The tensile test of a ±45° laminate is used to determine the in-plane shear response of polymer matrix composite materials. Uniaxial tensile force is applied in accordance to ASTM D3039, to a flat test specimen up to 5% shear strainstrain to investigate the in-plane shear stress/strain response, and critical mechanical materials properties including shear modulus and shear strength. Composite materials addressed in this standard include reinforced by continuous high-modulus fibers in the form of unidirectional layers with the fibres oriented at ± 45° symmetrical to the specimen main axis.

 

The ± 45° in-plane shear test is performed by placing a test specimen in the grips of either a servohydraulic or an electromechanical testing machine and subjecting it to controlled tension load up to 5% shear strain. The specimen response can be measured with a contacting or non-contacting extensometer, or strain gages.

 

Solutions for ASTM D3518 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 polymer matrix composite materials per ASTM D3518.

 

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.