Testing Products for ASTM D5766
APP-D5766Determines the effect of a hole on the tensile strength of a composite laminate. This configuration focuses on the Newton-Series control architecture to ensure high-fidelity data acquisition. Utilizing a 32-bit digital signal processor, the system provides a superior Signal-to-Noise Ratio (SNR), which is essential for capturing precise material transitions that lower-resolution systems often miss.
The load frame for this application has been selected to provide the most cost-effective solution capable of meeting the standard’s peak force requirements. While TestResources offers a wide range of frame geometries, this specific selection represents the optimal balance between laboratory CAPEX and technical compliance. Any frame in our catalog meeting the minimum load rating will adhere to the standard; however, this configuration is our primary recommendation for those seeking a reliable, streamlined testing platform without unnecessary complexity.=
Stress Concentration: This test measures how much the hole weakens the overall structure (Open Hole Tension).
Use Hydraulic Wedge Grips set to high pressure to prevent the carbon fiber from slipping at high loads.
Regulatory & Test Details
| App Id | APP-D5766 |
|---|---|
| App Standard | ASTM D5766 |
| Standard Organization | ASTM |
| Test Type | Tension |
| Material Type | Composite |
| Specimen Type | Strip with 6mm Hole |
| Industry Type | Aerospace |
| Min Force Kn | 250 |
| Max Force Kn | 1 |
| Max Spd Mm/m | 2 |
| Expert Spd | The standard for open-hole tension. Maintaining 2 mm/min ensures that the progressive fiber breakage around the notch is captured by the data logger. |
| Pointer App Software | N-ASTM-D5766 |
| Pointer Fixture Family | G-ASTMD5766 |
| Pointer Strain Family | E-ASTM-D5766 |
Implementation Commentary
Critical for airframe design where fasteners (holes) are unavoidable in primary structures.
Common Pitfalls
Using a dull drill bit to make the hole, which creates micro-delamination before the test even starts.