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D5573-99 – Standard Test Method Technical Guide
ASTM D5573 – 99 (Reapproved 2019) establishes a standard practice for classifying, identifying, and characterizing the failure modes observed in adhesively bonded fiber-reinforced-plastic (FRP) joints. Originally developed using glass fibers in a thermoset-polyester-resin matrix (sheet-molding compound, or SMC), the practice provides comprehensive terminology essential for contracts, drawings, and product specifications. By offering a universal language for failure analysis, it enhances communication between testing laboratories, design engineers, and quality assurance professionals.
🔧 Failure Mode Classification System
Seven distinct failure modes are defined within the standard. Correct classification relies on visual inspection of the fracture surfaces, often aided by the referenced ASTM adjunct of color photographs (ADJD5573). The following table summarizes the primary categories.
| 🟦 Failure Mode | 📏 Characteristic Description |
|---|---|
| Adhesive Failure | Separation occurs exactly at the adhesive-adherend interface, with no visible transfer of material. |
| Cohesive Failure | Rupture occurs entirely within the bulk of the adhesive layer. |
| Thin-Layer Cohesive Failure | © 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence. 📥 Standard Documents Download |