Testing Products for ASTM D6641
APP-D6641Evaluates the compressive strength and modulus of polymer matrix composites by applying load through a combination of end-loading and shear-loading. This method minimizes buckling and is preferred for multidirectional laminates. 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.=
Perfect Alignment: Even a 0.1° tilt will cause Euler buckling.
Apply Back-to-Back Strain Gauges. If readings differ by >10%, data is invalid.
Regulatory & Test Details
| App Id | APP-D6641 |
|---|---|
| App Standard | ASTM D6641 |
| Standard Organization | ASTM |
| Test Type | Compression |
| Material Type | Composite |
| Specimen Type | Plate with 6mm Hole |
| Industry Type | Aerospace, Defense |
| Min Force Kn | 50 |
| Max Force Kn | 300 |
| Max Spd Mm/m | 1.3 |
| Expert Spd | Matches ASTM D695 rates. Consistency across compression standards allows for a direct comparison of buckling vs. crushing behavior. |
| Pointer App Software | N-ASTM-D6641 |
| Pointer Fixture Family | G-ASTM-D6641 |
| Pointer Strain Family | E-ASTM-D6641 |
Implementation Commentary
This method is superior for capturing the true compressive strength of multidirectional laminates.
Common Pitfalls
Over-tightening the CLC bolts, which introduces parasitic friction loads.