ASTM D5868 Lap Shear Adhesion for Fiber Reinforced Plastic (FRP) Bonding

ASTM D5868 is a standard test technique for measuring the lap shear adhesion strength of bonded fiber-reinforced plastic (FRP) assemblies. This test method is extensively used to evaluate the strength and endurance of adhesive bonds used in FRP structures in industries such as aerospace, automotive, and construction. The ASTM D5868 test method is applicable to random and fiber oriented FRP assemblies.


Introduction to ASTM D5868

The ASTM D5868 test method describes a lap shear test for measuring the bonding characteristics of adhesives for joining fiber-reinforced plastics to themselves and to metals. It is applicable to random and fiber-oriented FRP and single-lap shear adhesive joints of FRP adherents. ASTM D5868 test results are useful for generating comparative apparent shear strength data for joints made from several FRP materials, providing a means by which FRP surface treatments can be compared. The ASTM D5868 test is applicable for determining adhesive strengths, surface preparation parameters and adhesive environmental durability. Maximum, minimum and average values of failure load are calculated in the ASTM D5868 test method. MaTestLab has the best network of testing labs in the USA to carry out ASTM D5868 test for clients.

ASTM D5868 Standard Test Method

BondingThe adhesive material is applied between two prepared FRP substrates, following the manufacturer’s instructions for application thickness, curing conditions, and other requirements.
CuringThe bonded assembly is allowed to cure for the specified time and conditions provided by the adhesive manufacturer to ensure its optimal strength before testing.
Test SetupThe test specimen is mounted in a suitable testing machine with grips or fixtures to apply a tensile load in a direction perpendicular to the bond line.
TestingA tensile load is applied at a specified rate until the bonded assembly fails, evenly, to ensure a uniform stress distribution along the bond line.
Data AnalysisThe maximum force required to cause bond failure is measured and recorded, and then it is divided by the overlap area of the test specimen to calculate the lap shear adhesion strength.
Lap Shear Testing for Adhesive Strength

ASTM D5868 Test Specimen

Specimen DetailsTest specimens consist of two FRP substrates bonded together with an adhesive in a rectangular shape to create a lap joint configuration.
Specimen DimensionsThe overlap area is 12.5 mm x specimen length, and the adhesive thickness is 0.25 mm to 1.0 mm (0.01 inch to 0.04 inch).
Specimen PreparationASTM D5868 specimens must be clean, dry, and free from any contaminants that may affect the bonding process.

ASTM D5868 Test Results

The maximum force applied to the bonded assembly before failure is Newton’s (N) or pounds-force (lbf). Lap shear adhesion strength is measured in Pascals (Pa), megapascals (MPa), or pounds per square inch (psi). It is calculated by dividing the maximum force by the overlap area of the test specimen. Adhesion strength indicates the ability of the adhesive to withstand shear stress. The values stated in inch-pound units are to be regarded as standard

Other Tests Related to ASTM D5868

ASTM D5868 is related to standards including ASTM D695 for compressive properties of rigid plastics and ASTM D3039 for tensile properties of polymer matrix composite materials. This test method is complementary to Test Method D1002 and extend the application to single-lap shear adhesive joints of fiber-reinforced plastic (FRP) adherends.


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How many samples are required for astm d5868?

The required number of samples or specimens should comply with the procedure given in the astm d5868 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

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How many days will it take to complete the astm d5868 test?

The turnaround time for astm d5868 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

Where can I get the astm d5868 tested?

You can share your astm d5868 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d5868 test to various testing techniques.

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