Parametric Tensile Testing Specimen
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Description
Parametric Tensile Testing Specimen (D638 Type I Metric)
This is a parametric 3D model of a tensile testing specimen, created in OpenSCAD and modeled to the ASTM D638 Type I (Metric) standard. This model is essential for accurate materials characterization, particularly for testing 3D-printed plastics and composites.
The OpenSCAD code is fully documented, using the standard ISO/ASTM notation (l1, b2, Lo, etc.) alongside descriptive names (e.g., l1__or__Reduced_Length). This makes the file both user-friendly and academically verifiable.
It utilizes the hull() function to guarantee a perfectly smooth fillet radius, which is crucial for preventing premature stress concentrations and ensuring reliable test results.
This model is ideal for academic research, quality control of 3D printing materials, and any project requiring standardized mechanical testing.
Key Features
- Standard Compliance and Ideal for Research: Default dimensions adhere precisely to the ASTM D638 Type I Metric standard.
- Standardized Variables: Uses ISO/ASTM standard notation (l1, b2, Lo) for easy cross-referencing with official documents.
- High Precision: All parameters and slider ranges are set to 2 decimal places for accurate metric input (mm).
- Smooth Fillet: Utilizes the OpenSCAD hull() function to generate a guaranteed smooth radius transition, minimizing stress risers.
- Fully Parametric: Easily adjust all major dimensions (l3, b1, r, T) via the customizer panel.
Important Usage Note
Always check the standard and adjust the size according to your needs. The default values are based on ASTM D638 Type I, which may not be appropriate for all materials (e.g., metals require different standards, such as ASTM E8). Before printing, verify that the chosen dimensions meet the requirements of your specific material and testing procedure.
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Parameter Table
| Parameter | Description |
|---|---|
| Lo__or__Gauge_Length | Gauge Length (Lo) in mm. The central section where strain is measured. |
| l1__or__Reduced_Length | Overall Parallel Length (l1) in mm. The length of the narrow, parallel section. |
| l2__or__Total_Reduced_Length | Total Reduced Length (l2) in mm. Includes the parallel length and the fillet transitions. |
| l3__or__Overall_Length | Overall Length (l3) in mm. The total length of the specimen. |
| b1__or__Width | Width (b1) in mm of the narrow, central gauge section. |
| b2__or__Grip_Width | Grip Width (b2) in mm of the wider gripping ends. |
| T__or__Thickness | Thickness (T) in mm. This is the constant depth of the specimen. |
| r__or__Fillet_Radius | Fillet Radius (r) in mm. The critical radius of curvature connecting the narrow and wide sections. |
Disclaimer
No Certification or Warranty. This 3D model is provided for research and informational purposes only. The creator makes no claim, warranty, or certification that the generated specimen meets the requirements of any regulatory body (such as ASTM, ISO, or other regulatory bodies). The user assumes all responsibility for verifying compliance, adjusting parameters, and conducting tests. The creator is not responsible for any liability, or issues arising from the use, application, or failure of specimens generated from this file.
Disclaimer
This model is a personal hobby project based entirely on publicly available imagery and general information; no proprietary, sensitive, or classified technical data was used in its creation. It is not affiliated with, nor endorsed by, any defense organization, manufacturer, or the creator's professional or academic work. This is a static, non-functional scale model intended solely for display and educational purposes. It is not a weapon and cannot be made to function as one.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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