ASTM D2293 Compression Shear Creep Test | Metal‑to‑Metal Adhesive Creep Tester

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Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

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ASTM D2293 Adhesive Shear Creep Test Machine | UnitedTest

UnitedTest supplies ASTM D2293 test equipment to measure time-dependent shear creep of metal-to-metal adhesive bonds under constant compressive shear loading for adhesive R&D and comparative performance evaluation.

ASTM D2293 Standard Test Method for Creep Properties of Adhesives in Shear by Compression Loading (Metal‑to‑Metal)

ASTM D2293 measures time‑dependent shear deformation (creep) of an adhesive bond between metal adherends when the joint is kept under a constant compressive shear load in a spring‑loaded fixture. It is intended for R&D and comparative evaluation of adhesive formulations and service‑condition effects, not as a universal design allowable by itself.

UnitedTest manufactures reliable testing machines to conduct ASTM D2293 metal-to-metal adhesive shear creep tests for material laboratories and adhesive manufacturers.

Test Principle:

A single‑lap bonded metal specimen is subjected to constant compressive load via a calibrated spring fixture. The compressive force generates shear stress within the adhesive bondline. Under constant stress, the adhesive develops progressive time‑dependent shear deformation (creep). A calibrated measuring microscope monitors relative displacement across the bondline over time. Creep strain is calculated as total measured deflection divided by original bond‑line thickness (mm/mm or in/in). Testing can run at room, elevated or reduced temperature until joint failure or test termination. If metal substrate buckling occurs under compression, the test result is discarded.

ASTM D2293 Compression-Loading Shear Creep Test

Key Parameters and Stipulations

Test Speeds: Ranging from 1 to 20 mm/min, depending on the material and the property being measured (e.g., 1 mm/min for modulus, 5 mm/min for yielding materials) .

Buckling Prevention: The specimen's length-to-thickness ratio is strictly regulated to prevent buckling, which would compromise the accuracy of the results.

Platens must be fully parallel and aligned; use spherical seat to eliminate bending stress.

Specimen ends must be flat, smooth, and perpendicular to the longitudinal axis.

Test speed, conditioning, and dimensions must be strictly controlled for comparable results.

Machine compliance shall be corrected for accurate modulus calculation.

Results are invalid if buckling occurs before the intended failure mode.

Test Specimen Information:

- Specimen geometry is a modified single‑lap shear joint, derived from ASTM D1002 tension lap‑shear configuration.

- Shear overlap length: 6.35 mm (1/4 in) (much shorter than D1002’s minimum 88.9 mm overlap).

- Specimen width: 25.4 mm (1 in); bond‑line thickness: nominally 1.6 mm. All edges shall be machined flat and square.

ASTM D2293 Compression-Loading Shear Creep Test required Testing Equipment:

Creep Test Machine

Creep and Relaxation Testing Machine is designed as low cost solutions for long-term creep and stress relaxation testing applications of metallic and alloy materials under high temperature in accordance with ASTM E139, BS, EN, ISO 204 and other similar international testing standards.

Spring‑loaded compression creep test assembly

Simple way:

- Slotted bolt (12.7 mm‑20 NF thread, 130 mm length)

- Bushings, cadmium‑plated piano‑wire helical compression spring (6 active coils, 8 total coils, closed‑wound, ground square ends)

- Washer (2.25 mm thickness, outer diameter 25.4 mm, inner diameter 12.7 mm) and matching nut

- Spring load is set according to pre‑established spring calibration curve by controlling spring deflection.

ASTM D2293 Compression-Loading Shear Creep Test

Calibrated measuring microscope

fitted with filar micrometer eyepiece and 10× objective lens for measuring tiny shear displacements across bond edges.

Key Test Parameters:

Loading mode: sustained compressive shear via spring

Stress input: target compressive/shear stress set by spring deflection using calibration curve

Temperature: room temperature by default; other temperatures using oven/cold box; standard notes temperature, load duration and moisture where relevant

Time: periodic displacement readings—hours to “as long as allowed” or until failure

Bondline thickness: required for creep normalization

Test procedure of ASTM D2293 Compression-Loading Shear Creep Test

1. Mount the prepared lap‑shear specimen centrally in the slot between washer and bushing of the spring fixture.

2. Tighten the nut to compress the helical spring to the target deflection according to spring calibration curve, to apply the desired constant compressive load onto the specimen.

3. Use the calibrated filar microscope to observe average relative displacement of the pre‑scribed fine reference scratches across both sides of the lap joint bond‑line.

4. Periodically record deflection readings over the whole test duration to build the full creep‑time curve; continue measurement until adhesive joint fails or the test is stopped.

5. For non‑room‑temperature tests: place the whole loaded apparatus inside oven or cold box. Two measurement options are allowed:

- Option 1: quickly remove assembly for microscopic measurement then promptly return it to thermal chamber before temperature shifts significantly.

- Option 2: add auxiliary scribe marks periodically while inside chamber; measure all marks after test completion at ambient temperature (specimen may be unloaded). Post‑unloading displacement relaxation can also be captured.

6. Discard test data if metal substrate buckling appears.

7. Document average deflection, compressive stress magnitude, loading duration, test temperature for every specimen.

Industries Application:

Because it evaluates long‑term dimensional stability of metal‑to‑metal adhesive joints under sustained shear, D2293 is used in:

Aerospace – structural metal bonding, assembly qualification, temperature‑driven creep screening

Automotive – body panels, brackets, powertrain components, lightweight metal bonding

Construction / infrastructure – steel/aluminum bonded connections, long‑term load retention

Electronics/industrial equipment – metal housings, heat sinks, fixtures where sustained clamping/shear matters

Adhesive R&D and QC – formulation comparison (epoxy, acrylic, polyurethane, etc.), supplier batch qualification, simulation input for FEA creep models

It is especially useful when short‑term strength tests (e.g., D1002) are insufficient to predict long‑duration service deformation.

Related Test Standard

ASTM D1002	Apparent shear strength of single‑lap adhesively bonded metal specimens by tension loading; D2293 specimens are derived from this geometry
ASTM D2294	Standard Test Method for Compressive Properties of Rigid Cellular Plastics
ASTM D2293	Standard Test Method for Creep Properties of Adhesives in Shear by Compression Loading (Metal-to-Metal)
ASTM D1780	Practice for conducting creep tests of metal‑to‑metal adhesives, typically dead‑weight/lever tensile‑shear creep, temperature/time based.
ASTM D2295	Comparative shear strength of metal‑to‑metal adhesives at elevated temperature (strength, not creep).

Importance of This Test for Adhesive Materials

Many structural adhesives show time‑dependent deformation (creep) under sustained static shear stress, even if their short‑term lap‑shear strength is satisfactory.

1. This test reveals long‑term dimensional stability risk for bonded metal joints under permanent load, which short‑term strength tests cannot detect.

2. It quantifies how creep performance changes with adhesive formulation, temperature and environmental exposure, supporting adhesive selection and product formulation optimisation.

3. It provides creep‑strain data for engineering lifetime prediction of statically‑loaded metal‑bonded assemblies.

4. It offers an affordable, portable method to rank different adhesives regarding long‑term shear resistance, supporting R&D comparison and quality evaluation for industrial bonded components.

Keywords: ASTM D2293 Compression-Loading Shear Creep Test, ASTM D2293, adhesive shear creep test, metal to metal adhesive creep, compressive loading shear creep, spring loaded creep fixture, adhesive creep properties, structural adhesive creep test, adhesive bond long term deformation, adhesive formulation testing, adhesive shear deformation test, adhesive R&D testing, creep test machine for adhesives, UnitedTest adhesive tester, static shear creep measurement, bonded metal joint creep test

High Temperature Creep and Relaxation Testing Machine is designed as low cost solutions for long-term creep and stress relaxation testing applications of metallic and alloy materials under high temperature in accordance with ASTM, BS, EN, ISO and other similar international testing standards.

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

Compression test fixture is used to investigate the compressive behaviour of the test specimens and for determining the compressive strength, compressive modulus and other aspects of the compressive stress/strain relationship under the conditions defined.

Q1: What is ASTM D2293 test used for?

A: ASTM D2293 evaluates time‑dependent shear creep deformation of metal‑to‑metal adhesive bonds under sustained compressive stress. It measures how much an adhesive joint slowly deforms over hours, days or weeks under constant static load, at controlled room, high or low temperature. It is not a short‑term strength test, but a long‑term durability screening test for structural adhesives.

Q2: Why is ASTM D2293 important for adhesive materials?

A: Short‑term lap‑shear strength (e.g. ASTM D1002) only gives instant failure load, but cannot predict slow, permanent creep drift in real‑service static loading conditions. Many adhesives show acceptable short‑term strength yet creep significantly under long‑term compression‑shear, risking joint dimensional shift or delayed failure. This test generates creep‑strain data to rank adhesive formulations, verify temperature‑moisture influence, and support service‑life estimation for statically‑loaded metal‑bonded assemblies.

Q3: What is the core test principle of ASTM D2293?

A: A spring‑loaded fixture applies constant compressive load to modified single‑lap bonded metal specimen. Compression creates shear stress inside the adhesive bond‑line. A calibrated filar‑micrometer microscope tracks relative shear displacement across bond‑line reference scribed marks over time. Creep strain = total measured deflection ÷ bond‑line thickness (mm/mm or in/in).

Q4: How does ASTM D2293 specimen differ from ASTM D1002 lap‑shear specimen?

A: Specimen preparation largely follows ASTM D1002, but overlap shear length is only 6.35 mm (1/4 inch), much shorter than D1002’s minimum 88.9 mm overlap. Specimen width is 25.4 mm, nominal bond‑line thickness 1.6 mm. Three fine scribe reference lines must be marked across bond‑line edges for displacement reading.

Q5: What is the difference between ASTM D2293 and ASTM D2294?

A: ASTM D2293: Creep in shear by compression loading (spring compression drives lap‑joint shear).

ASTM D2294: Creep in shear by tension loading (pull‑type sustained load for metal‑to‑metal adhesive joints). They are complementary creep standards for adhesive shear creep, differing in load direction.

Q6: My specimen shows metal substrate buckling during compression creep test, what should I do?

A: Per clause 7.5 of the standard, the test shall be discarded and specimen redesigned. Buckling comes from metal substrate compressive deformation, not adhesive creep, so measured deflection data becomes invalid for adhesive creep calculation. Adjust substrate thickness or geometry to avoid metal buckling.

Q7: How do I take creep readings for non‑ambient‑temperature tests (oven / cold‑box)?

A: Two permitted methods:

Quickly remove fixture‑specimen assembly, take microscope readings, return immediately to thermal chamber before temperature drifts significantly.

Scribe auxiliary reference marks while inside temperature chamber; complete all displacement measurements at room temperature after finishing test (specimen may be unloaded). Post‑unload creep relaxation can also be recorded.

Q8: How is creep value calculated for test report?

A: Creep strain = total average measured deflection / bond‑line thickness. Unit is dimensionless (mm per mm or inch per inch). The report must also record applied compressive stress, loading duration, test temperature and failure mode if joint fails prematurely.

Q9: Why choose ASTM D2293 Compression‑Loading Shear Creep Test Equipment from UnitedTest?

A: UnitedTest manufactures ASTM D2293‑96(R2024) compliant compression‑loading shear creep test apparatus for metal‑to‑metal adhesives. Complete spring‑loaded creep fixture, calibrated measuring microscope and temperature‑chamber compatible solution for adhesive long‑term creep characterization, R&D and quality control.

UnitedTest is a professional manufacturer of adhesive testing equipment, supplying fully‑compliant ASTM D2293 compression‑loading shear creep test apparatus for metal‑to‑metal adhesive bonds.

Our ASTM D2293 test system includes standard spring‑loaded creep fixtures per ASTM drawing requirements, precision‑calibrated filar micrometer microscope, and optional matched high‑low‑temperature environmental chamber accessories. The spring‑loaded fixture design keeps constant compressive static load unchanged when transferring specimens in and out of temperature chambers, exactly following standard test workflow for adhesive shear creep measurement.

This test equipment characterizes time‑dependent creep deformation of structural adhesives under sustained compression‑induced shear stress. It measures creep strain over extended time under varied temperature conditions, supporting adhesive formulation comparison, material screening, service‑life assessment for aerospace, automotive, machinery metal‑bonded assemblies.

Key features of UnitedTest ASTM D2293 creep test setup:

Fully complies with ASTM D2293‑96(R2024) standard, fixture dimensions match standard drawing
Pre‑calibrated cadmium‑plated helical compression spring assembly
High‑precision filar measuring microscope (10× objective lens) for bond‑line displacement reading
Portable fixture unit: multiple parallel‑test stations available for batch specimen testing
Compatible with oven / cold‑box for high‑temperature and low‑temperature creep testing
Supports test‑data recording: deflection, stress magnitude, hold duration, test temperature, failure mode
Turn‑key solution: fixture set, microscope, operation guideline, specimen machining reference, test‑report template

UnitedTest provides custom fixture modification, after‑sales technical support and training for adhesive laboratory users, material R&D institutes, third‑party testing labs and industrial quality‑control departments.

Related standards we support: ASTM D2294 (tensile shear creep), ASTM D1002 (lap‑shear strength), ASTM D907 adhesive terminology reference.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you