Parametric Tensile Testing Specimen

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.

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