ASTM D1062 Standard Test Method for Cleavage Strength of Metal-to-Metal Adhesive Bonds

Get Certified ASTM D1062 Cleavage Strength Testing

Cleavage loading can produce concentrated stresses in adhesive joints between metal components. ASTM D1062 (Standard Test Method for Cleavage Strength of Metal-to-Metal Adhesive) testing can support adhesive-system selection, process control, quality control, and engineering design by confirming whether the adhesive system can handle the loading conditions.

• Evaluates metal-to-metal adhesive bonds by applying controlled loading to determine how much force the bonded joint can withstand before cleavage failure occurs. 
• Determines the cleavage strength of adhesive joints under the specified specimen configuration and loading conditions. 
• Provides comparative data that can be used to evaluate adhesives and the effects of metallic materials and specified surface treatments under the test conditions.
• Examines adhesive joint failure behavior to help identify whether separation occurs through the adhesive, at the adhesive-metal interface, or through the metal substrate. 
• Supports comparison of adhesive systems and manufacturing processes by providing standardized cleavage-strength data. 
• Provides performance information for material qualification, quality control, engineering design, and product development involving bonded metal components. 

What are the Benefits of ASTM D1062 Testing?

ASTM D1062 testing provides comparative cleavage-strength data for evaluating adhesive systems used to bond metal components. The results support adhesive selection, process optimization, quality assurance, and product qualification.

• Evaluates structural metal adhesive joints to determine whether the selected adhesive can withstand concentrated cleavage loading during service. 
• Tests the effects of metal surface preparation and adhesive curing on joint strength to determine processing factors that enhance joint strength. 
• Helps with quality control in adhesive-bonded manufacturing by comparing the results of the cleavage strength of adhesive formulations, production processes, and batches. 
• Adhesive manufacturers can use the comparative results to support adhesive evaluation and material-selection activities when the test conditions represent the intended comparison.

What is Cleavage Strength in an Adhesive Bond?

Cleavage strength is the resistance of an adhesive joint when loaded to pull the surfaces apart in such a way that the stress is concentrated at one edge or one area of the joint. Cleavage loading results in a localized stress concentration that can be stress-raising and cause progressive separation.

Why is ASTM D1062 Testing Important?

Uniform loading of metal adhesive bonds works well, but strong peeling or cleavage forces at the end of a joint can cause bond failure. ASTM D1062 evaluates this adhesive-joint behavior in a controlled manner. The findings help engineers select the right adhesive for a given application, optimize surface preparation and curing, and design metal parts with greater bonding reliability.

What Materials Can Be Tested According to ASTM D1062?

ASTM D1062 applies to adhesive bonds tested on standard-shaped metal specimens under specified preparation and testing conditions. The method is suitable for comparing bonded combinations of materials such as steel, stainless steel, aluminum and its alloys, copper and its alloys, and other engineering metals where the specimen shape and adhesive are appropriate for the test.

• ASTM D1062 can be used with recommended metal specimens including brass, copper, aluminum, steel, and phosphor bronze.
• Evaluates the performance of adhesive bonds between aluminum and aluminum alloys and the effect of surface preparation and curing, and compares the performance relative to the other. 
• Evaluates resistance of bonded metal assemblies to concentrated cleavage forces on tests of stainless-steel adhesive joints. 
• Analyzes copper and copper-alloy adhesive bonds to provide comparative data for metal bonding applications when required by an engineer. 
• Permits testing of other acceptable engineering combinations of metals if the adhesive joint can be prepared and tested in the specified specimen configuration. 

How Does ASTM D1062 Determine Cleavage Strength?

ASTM D1062 uses a standard-shaped bonded metal specimen that is tested in a testing machine under the specified loading conditions. The specimen geometry localizes the applied force at the adhesive joint where cleavage stress occurs, leading to separation of the adhesive joint surfaces. The laboratory determines the cleavage strength and reports the required adhesive identification, preparation method, adhesive-layer thickness, conditioning procedure, testing-room condition, specimen number, and loading rate.

ASTM D1062 Testing Process and Data Collection

Technicians prepare the metal adherends and surfaces according to the specified preparation procedure before applying the adhesive. They prepare the specimens with predetermined bond conditions and cure the adhesive as per the procedure. Technicians place the bonded specimen in the testing machine and apply the specified loading rate until failure occurs. The maximum breaking force, specimen size, adhesive type, bond condition, cure condition, and fracture observation are recorded in the laboratory for analysis and reporting.

Common Challenges and Troubleshooting

Cleavage-strength results can be affected by specimen preparation, adhesive-layer thickness, conditioning, surface treatment, specimen alignment, and other variations in the prescribed test conditions. Laboratories avoid these problems by controlling surface preparation, adhesive application, curing conditions, specimen dimensions, specimen alignment, and testing-machine calibration.