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Polymer Rail Shear test fixture

Polymer Rail Shear test fixture

ASTM D4255

Rail Shear Test fixture are described as Method B in ASTM Standard ASTM D4255, mainly used to measure the polymer mechanical strength. 


The specimen is 6 in. long and 5 3/8 in. wide, and of the desired thickness. 

Details of specimen preparation and installation, and a complete test procedure, are included in ASTM Standard ASTM D4255. This standard also includes the two-rail shear test method, as Method A, this fixture also being available from Wyoming Test Fixtures, Inc. The two-rail version has the advantage of utilizing a smaller specimen, with only six rather than nine holes to prepare. However, the three-rail version is attractive because it loads the specimen symmetrically.


General introduction

Rail Shear Test fixture are described as Method B in ASTM Standard ASTM D4255, mainly used to measure the polymer mechanical strength. 

The specimen is 6 in. long and 5 3/8 in. wide, and of the desired thickness. 

Details of specimen preparation and installation, and a complete test procedure, are included in ASTM Standard ASTM D4255. This standard also includes the two-rail shear test method, as Method A, this fixture also being available from Wyoming Test Fixtures, Inc. The two-rail version has the advantage of utilizing a smaller specimen, with only six rather than nine holes to prepare. However, the three-rail version is attractive because it loads the specimen symmetrically.

Polymer Rail Shear test fixturePolymer Rail Shear test fixture


These shear tests are designed to produce in-plane shear property data for material specifications, research and development, and design.

Factors that influence the shear response and should therefore be reported include: material, methods of material preparation and lay-up, specimen stacking sequence, specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, speed of testing, time at temperature, void content, and fiber volume reinforcement content.

Properties that may be measured by this test method include:
In-plane shear stress versus engineering shear strain response,
In-plane shear chord modulus of elasticity,
Offset shear stress, and
Maximum in-plane shear stress. 

In cases in which the engineering shear strain at failure is greater than 5 %, the shear stress corresponding to 5 % engineering shear strain should be reported.


Standard

ASTM D4255 Rail Shear Test In-Plane of Polymer Matrix Composite Materials –

ASTM D4255 Standard Test Method for In-Plane Shear Properties of Polymer Matrix Composite Materials by the Rail Shear Method

ASTM D4255 is test method for measuring in‑plane shear properties of fiber‑reinforced polymer‑matrix composite materials using the rail‑shear fixture approach. It defines two distinct test configurations (Procedure A two‑rail shear, Procedure B three‑rail shear) to obtain shear stress‑strain curves, shear chord modulus, offset shear stress, and maximum in‑plane shear stress for composite laminates. The standard applies for continuous‑fiber, woven‑fabric, balanced‑symmetric laminates and randomly‑oriented short‑fiber polymer‑matrix composites. It notes that shear‑stress gradients and grip‑area stress concentrations may degrade reproducibility; D5379 and D7078 deliver more uniform pure‑shear stress states in gage sections.

ASTM D4027 Modified-Rail Shear Test for Structural Adhesives –

ASTM D4027 Standard Test Method for Measuring Shear Properties of Structural Adhesives by the Modified-Rail Test

ASTM D4027 defines how to measure the shear modulus and shear strength of an adhesive layer sandwiched between two rigid adherends, using a purpose-built modified-rail shear tool. 

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