Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading - PDF
ASTM D905 Test Fixture – Universal Grip Data Sheet (PDF)
Theory:
The ASTM D905 Compression Shear Test Fixture is specifically designed for evaluating the bond strength of adhesives in wood and laminated materials. This fixture is used to perform shear tests under compressive loads, helping manufacturers and researchers determine the reliability and durability of adhesive joints in structural wood products.
How the ASTM D905 Fixture Works:
This test method involves placing a wood specimen with an adhesive bond into the fixture and applying a controlled compressive shear force. The objective is to measure the maximum load required to cause failure along the adhesive joint. This data is critical for assessing the strength, durability, and performance of adhesives used in engineered wood products such as plywood, laminated veneer lumber (LVL), and glued laminated timber (Glulam).
Key Features of the ASTM D905 Fixture:
✅ Precision Machining: Ensures accurate and repeatable results by maintaining uniform pressure distribution.
✅ Universal Compatibility: Designed to work with most universal testing machines (UTMs) for easy integration.
✅ Durable Construction: Made from high-strength steel to withstand high compressive forces.
✅ Secure Specimen Clamping: Holds samples firmly in place, preventing misalignment during testing.
✅ ASTM D905 Compliance: Fully adheres to ASTM D905 testing standards, ensuring reliable and industry-accepted results.
Applications of the ASTM D905 Compression Shear Test:
🔹 Wood Adhesive Quality Control – Essential for certifying adhesives used in structural wood applications.
🔹 Lumber & Engineered Wood Testing – Determines bond strength in plywood, laminated beams, and other composite wood products.
🔹 Aerospace & Marine Industries – Evaluates adhesive performance in specialty wood components used in high-performance applications.
🔹 Research & Development – Helps engineers develop and test new adhesive formulations for improved performance.
This fixture is a critical tool for adhesive manufacturers, construction material producers, and research laboratories, ensuring compliance with industry standards and improving the safety and reliability of bonded wood structures.
Upgrade your material testing capabilities with the ASTM D905 Compression Shear Test Fixture and a Universal Testing Machine from Universal Grip. Request a quote today!
ASTM D905 Specimen
-
Wood: hard maple with a specific gravity of at least 0.65, straight grained and free of defects in the shear area, at 10–12% moisture content unless the adhesive maker specifies otherwise.
-
Two 19 mm (¾ in) laminations are bonded and cut into blocks with a bonded shear area of 44.4 × 50.8 mm (1¾ × 2 in), about 2,256 mm² (3.5 in²).
-
The two halves are offset by 6.3 mm (¼ in), giving each block a step for the shearing tool to push on. The grain runs parallel to the direction of loading.
-
Test at least 20 specimens taken from at least four bonded joints.
Test Procedure
-
Condition the specimens at 23 ± 1 °C and 50 ± 2% RH for 7 days, or until their weight stops changing.
-
Measure the bond length and width at the glue line to the nearest 0.25 mm (0.01 in).
-
Seat the specimen in the shearing tool. Its self-aligning seat spreads the load evenly across the width of the bond.
-
Load in compression at 5 mm/min (0.2 in/min) until the bond fails, and record the peak load. The standard calls for a machine with at least 6,800 kg (15,000 lb) compression capacity.
-
Estimate the percent wood failure on the failed surfaces of each specimen.
Calculating Shear Strength
Shear strength is the peak load divided by the bonded area:
τ = P ÷ (L × W)
Example: a block with a 44.4 × 50.8 mm bond (2,256 mm²) fails at 25,000 N. τ = 25,000 ÷ 2,256 = 11.1 MPa (about 1,610 psi).
Report each specimen's shear strength with its estimated percent wood failure, plus the average, maximum and minimum. High strength with high wood failure means the bond is stronger than the wood itself.
Similar Specifications
ASTM C557 - Gypsum Wallboard (Drywall) Shear Test
ASTM D905 FAQ
What is the test speed for ASTM D905?
5 mm/min (0.2 in/min), applied in compression through a shearing tool with a self-aligning seat.
What is the ASTM D905 specimen size?
Two bonded hard maple blocks with a 44.4 × 50.8 mm (1¾ × 2 in) shear area, offset 6.3 mm (¼ in) so the tool can load each half.
What is percent wood failure?
The share of the failed bond area where wood fibers tore away instead of the adhesive letting go. It is reported for every specimen alongside its shear strength.
What is the difference between ASTM D905 and ASTM D1002?
D905 is a block shear test: wood blocks loaded in compression. D1002 is a lap shear test: metal strips with a 12.7 mm overlap pulled in tension.
For a side-by-side comparison of block shear and lap shear (ASTM D905, D4501 and D1002), read our lap shear vs. block shear guide.
