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What are the hardness, tensile strength, and elongation at break values ​​for 3D-printed products?

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What are the hardness, tensile strength, and elongation at break values ​​for 3D-printed products?

Introduction

When choosing 3D printing for functional prototypes, understanding the mechanical properties of the finished product—including hardness, strength, and toughness—is crucial. Different 3D printing methods utilize distinct materials and molding principles, resulting in fundamentally different mechanical properties. While the website article you provided primarily focuses on the application characteristics of each method and does not provide specific physical data, we can understand their performance based on their material properties.

Detailed Explanation of the Mechanical Properties of Products from Each Method

Selective Laser Sintering (SLS) – The Toughest Choice

SLS primarily uses nylon (PA) powder. Its finished products are known for their exceptional mechanical strength and toughness, with properties closest to those of conventional injection-molded engineering plastics.

  • Hardness and Strength: SLS nylon products offer excellent hardness and wear resistance, as well as high tensile strength, sufficient to withstand rigorous dynamic functional testing, such as load bearing, impact, and repeated assembly of snap-fits.
  • Elongation at Break (Toughness): Nylon is inherently a highly tough material, so SLS finished products exhibit excellent elongation at break, making them less susceptible to brittle fracture under stress.

Stereolithography (SLA) – The Most Versatile Option

The mechanical properties of SLA depend on the selected photosensitive resin formulation, offering a wide range of options that can be tailored to your testing needs.

  • Hardness and Strength: SLA offers a variety of “engineering resins” that can simulate common plastics. For example, “ABS-like resins” offer a good balance of strength and toughness, while “PC-like resins” offer higher strength and temperature resistance.
  • Elongation at Break (Toughness): Similarly, you can choose between standard resins (lower toughness and brittleness) or “high-toughness resins” that can withstand a certain degree of impact and pressure.

Fused Deposition Modeling (FDM) – Directional Performance

The mechanical properties of FDM are influenced not only by the material (e.g., PLA, ABS) but also by the physical properties of the layers stacked together.

  • Hardness and Strength: The strength of FDM finished products is “anisotropic.” That is, the strength is higher along the print grain direction (X/Y axis), but significantly weaker perpendicular to the grain direction (Z axis), making the part susceptible to delamination or fracture when subjected to stress in this direction.
  • Elongation at Break (Toughness): Toughness is also affected by directional properties. During functional verification, the failure mode may be due to the process itself rather than a design flaw, so the reference value of this data is relatively low.

Conclusion

In summary, for the most reliable mechanical property verification:

If you are looking for the highest combined strength and toughness, SLS should be the preferred choice, as its properties are closest to those of real engineering plastics.

If you need to simulate the properties of a specific plastic (such as the toughness of ABS or the strength of PC), you can choose the corresponding SLA engineering resin.

Due to its significant directional strength, FDM is less suitable for rigorous mechanical property testing and is primarily used for initial concept models.

Before conducting any critical functional testing, it is recommended to discuss specific testing requirements with your manufacturing partner to select materials and construction methods that best reflect your design intent.