Bond Pull Testing
In a bond pull test, two materials are bonded together using an adhesive, and then subjected to a pulling force or tensile load in a controlled manner until the bond fails or breaks. The force required to break the bond is measured, and it provides an indication of the strength of the bond. The bond pull test is usually performed using specialized equipment, such as a universal testing machine, which can accurately apply and measure the pulling force.
The bond pull test is used to:
- assess the performance of adhesives
- evaluate the effectiveness of bonding processes
- determine the suitability of adhesive materials for specific applications
- ensure that bonded materials meet required quality standards
It is an important test in the field of adhesives and bonding technology, as it helps ensure the integrity and durability of bonded materials in various applications.
BOND PULL TESTING ANALYSIS
Adhesion Selection
Comparative testing determines the performance of different adhesives, bond strength, the most suitable adhesive for a specific application or intended use case. Process validation.
Failure Analysis
Investigative assessment of when a bonded assembly fails and to determine the mode of failure: adhesive failure, cohesive failure, or substrate failure.
Quality Control
Bond pull testing can be used for quality control by ensuring adhesive performance, detecting bond defects or inconsistencies (poor bonding, incomplete curing, inadequate surface preparation), monitoring process variability (curing time, temperature, and pressure), assessing adhesive batch variability, and statistical process control (SPC) to monitor the performance of adhesive bond over time.
Material Evaluation
Comparing different materials, evaluating material surfacing treatments (cleaning, priming, or roughening), assessing material compatibility, evaluating material aging or degradation, determining bond strength of new materials, and conducting failure analysis are all ways bond pull testing evaluates materials for use in various industries.
Compliance Standards
Bond pull testing may be required to comply with industry standards ore regulations that specify the minimum adhesion strength or performance requirements for bonded assemblies. Adhesives that meet or exceed the requirements my be selected as the appropriate adhesive for the application.
BOND PULL TESTING ASTM C633
ASTM C633 Standard Test Method for Adhesion or Cohesion Strength of Thermal Spray Coatings” determines the adhesion or bond strength of thermal spray coatings. The test method described in ASTM C633 is used to evaluate the adhesion or cohesion strength of the coating to the substrate or between coating layers.
The ASTM C633 standard specifies the equipment, sample preparation, testing procedures, and calculation methods for determining the bond strength of thermal spray coatings. The test involves applying a controlled tensile or shearing force to the coating, perpendicular or parallel to the surface until the coating fails or debonds from the substrate. The maximum force or stress at which the coating fails or debonds is recorded as the bond strength of the coating.
ASTM C633 provides a standardized and widely accepted method for evaluating the bond strength of thermal spray coatings, allowing for consistent and comparable results across different laboratories and industries. It is an important tool for quality control, process optimization, and material selection in thermal spray coatings.
MECHANICAL TESTING METHODS
- Abrasion (Taber)
- Adhesion (Peel) Testing
- Bend Testing
- Bond Strength Testing
- Charpy Impact Testing (-320°F to 450°F)
- Climbing Drum Adhesion of Sandwich Composites
- Coating Adhesion
- Coating Shear Fatigue
- Coefficient of Thermal Expansion by TMA
- Composite Testing (Fiber Reinforced)
- Compression Set
- Compressive Properties
- Core Shear Properties of Sandwich Construction by Beam Flexure
- Creep and Stress Rupture Testing
- DMA (Dynamic Mechanical Analyzer)
- Ductility
- Elastic Modulus
- Fatigue Testing
- Filled Hole Tension & Compression
- Flattening
- Flat-wise Tensile Testing
- Flexural Properties
- Floating Roller Peel Strength
- Fracture Mechanics
- Gel Time
- Hardness (Rockwell, Brinell, Durometer, Shore, Barcol, Knoop, Vickers, Macro Vickers)
- Heat Aging
- Heat Deflection by TMA
- Heat Treatment (furnace to 2100°F)
- Hydrogen Embrittlement
- Hydrostatic Pressure
- Indentation Toughness
- Interlaminar Shear
- Jominy Hardenability
- Lap Shear Testing
- Machining & Specimen Preparation
- Materialography
- Modulus of Rupture (MOR)
- n-Value (Strain Hardening Exponent)
- Open Hole Tension and Compression
- Pipeline Integrity Testing
- r-Value (Plastic Strain Ratio)
- Residual Strength of Composites After Impact
- Rotating Beam Fatigue
- Shear Testing of Rivets to ASTM B565, Single/Double
- Short Beam Strength
- Shot Peen Qualification
- Single-Edged Notched beams (SENB)
- Slow Strain Rate (G129)
- Specimen Conditioning
- Strain Gaging
- Surface Roughness (ANSI/ASME B46.1)
- T Peel Strength
- Tear Resistance of Films & Sheeting
- Tear - Rubbers & Elastomers
- Tensile Testing
- Torsional and Axial Fatigue (200 lb)
- Tube Testing (Tensile, Flare, Hydrostatic)
- Welder & Procedure Qualification
- Wire/Spring Testing (Wrap, Coil, Bend)
- Young's, Tangent and Chord Modulus (Room Temperature)
