ASTM D7905

Standard Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites

ASTM D7136

Standard Test Method for Measuring the Damage Resistance of a Fiber-Reinforced Polymer Matrix Composite to a Drop-Weight Impact Event

ASTM D7028

Standard Test Method for Glass Transition Temperature (DMA Tg) of Polymer Matrix Composites by Dynamic Mechanical Analysis (DMA)

ASTM D5766

Standard Test Method for Open-Hold Tensile Strength of Polymer Matrix Composite Laminates

ASTM D5528

Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites

ASTM D5467

Standard Test Method for Compressive Properties of Unidirectional Polymer Matrix Composite Materials Using a Sandwich Beam

ASTM D3165

Stress and Failure Analyses of Adhesive-Bonded Composite Joints using ASTM D3165 Specimens


 Interlaminar Fracture Toughness by Double Cantilever Beam Method

This method determines the interlaminar fracture toughness of a material by applying a constant tensile force to a bond to induce a crack.  The surfaces are pulled apart without sliding or shearing.

After appropriately conditioning and machining the specimens, a specimen is placed into the fixture and the machine begins to separate the specimen by pulling apart at the crack opening to a pre-specified distance.  The machine then returns to the zero extension point so that a calculation can be performed for the area within the curve produced.

Interlaminar toughness

Equipment Used:
Test frame, double cantilever beam test fixture

ASTM D7264

ASTM D7264 Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials

This test is designed for testing of flexural properties of polymer matrix composites by using a coupon of a rectangular cross section supported by two parallel beams set to a specific support span and deflected at a constant rate from the center of the span.

This test contains two procedures.  Procedure A involves a three point loading system, while procedure B utilizes a four point loading system.  Each procedure requires different calculations for strain due to the different deflections per each system.

Flexural strength, maximum flexural stress, maximum strain, modulus of elasticity, failure mode, location of failure

Equipment Used:
Test frame, four point flexural fixture, three point flexural fixture

ASTM D6641

ASTM D6641 Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials Using a Comined Loading Compression (CLC) Test Fixture

This method is performed by applying combined end-loading and shear-loading using a combined loading compression fixture. This standard is designed to analyze the compression properties of polymer matrix composite laminates employing either multidirectional or unidirectional fibers or other comparable materials.

The specimen is placed inside the test fixture and bolts tightened to a specific torque.  It is then placed within between two platens in the testing machine and a strain measuring device may be attached. The specimen is then compressed to failure.

Laminate compressive strength, laminate compressive modulus, compressive Poisson’s ratio by chord method

Equipment Used:
Test frame, CLC test fixture, compressometer or strain gauges