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<p>This study examines the combined effects of post-curing duration, build orientation, and lift speed on the mechanical performance of stereolithography (SLA)-printed photopolymer components. Mechanical characterization was conducted through ultimate tensile strength (UTS), Shore hardness, and impact strength measurements under varied processing conditions. Results reveal that extended post-curing substantially enhances performance; increasing curing time from 30 to 90&#xa0;min led to improvements of 24.4% in UTS, 11.3% in hardness, and 28.6% in impact strength. Build orientation exhibited a pronounced influence, with specimens fabricated at 30° achieving the highest values (UTS ≈ 52&#xa0;MPa, hardness ≈ 79, and impact strength ≈ 3.5&#xa0;J/cm), whereas those printed at 90° demonstrated the weakest properties, indicating reduced interlayer bonding. Similarly, lift speed significantly affected outcomes, with slower speeds (30&#xa0;mm/min) producing superior tensile strength (~ 48&#xa0;MPa), hardness (~ 79), and impact strength (~ 3.2&#xa0;J/cm) compared to higher speeds. These findings confirm that mechanical properties in SLA printing are highly sensitive to processing parameters. Optimizing these variables is essential for achieving reliable performance, particularly in functional or load-bearing applications.</p>

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Mechanical Characteristics of SLA Printed Parts Using Photopolymer Resin

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Mahantesh M. Math,
  • R. Sridhar,
  • A. Bharatish,
  • Radha Halagani,
  • S. G. Divya Sharma,
  • J. Reddy Naik,
  • Mohammed Najeeb,
  • Shrishail B. Sollapur

摘要

This study examines the combined effects of post-curing duration, build orientation, and lift speed on the mechanical performance of stereolithography (SLA)-printed photopolymer components. Mechanical characterization was conducted through ultimate tensile strength (UTS), Shore hardness, and impact strength measurements under varied processing conditions. Results reveal that extended post-curing substantially enhances performance; increasing curing time from 30 to 90 min led to improvements of 24.4% in UTS, 11.3% in hardness, and 28.6% in impact strength. Build orientation exhibited a pronounced influence, with specimens fabricated at 30° achieving the highest values (UTS ≈ 52 MPa, hardness ≈ 79, and impact strength ≈ 3.5 J/cm), whereas those printed at 90° demonstrated the weakest properties, indicating reduced interlayer bonding. Similarly, lift speed significantly affected outcomes, with slower speeds (30 mm/min) producing superior tensile strength (~ 48 MPa), hardness (~ 79), and impact strength (~ 3.2 J/cm) compared to higher speeds. These findings confirm that mechanical properties in SLA printing are highly sensitive to processing parameters. Optimizing these variables is essential for achieving reliable performance, particularly in functional or load-bearing applications.