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<p>Additive manufacturing has gained significant attention from researchers due to its ability to produce complex geometries, reduce material waste, and high customization. In this research, a new failure criterion is initially developed for transversely isotropic materials under the assumption of plane stress. An appropriate empirical factor was introduced into the model through trial and error. Subsequently, using experimental data from open literature that the build orientation was upright/on-edge, the tensile strengths of 3D printed parts at various printing angles are validated against existing theories. It is observed that the developed failure criteria can predict strengths for four different datasets with acceptable accuracy. Next, the developed model is utilized to predict the transition angle. Validating the transition angles prediction, another dataset is used for various thicknesses of 0.4, 0.5, and 0.6&#xa0;mm. Based on the fracture surface images, it is observed that the developed model predicts the transition angle with higher accuracy compared to other existing theories. Moreover, ABS and PLA samples are 3D printed with a layer thickness of 0.1&#xa0;mm and flat build orientation with various printing angles, and their strengths are measured by tensile tests. The strengths of the testing specimens are also estimated using available theories and developed failure criteria. It is observed that the developed model for both materials provides the highest accuracy after the bilinear model. It was also found that the developed model is capable of predicting strength in different orientations, even for thicker layer configurations where experimental data exhibit nonlinear behavior. This indicates that the model can accurately predict strength with high precision in such cases.</p>

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Estimating Strength of 3D-Printed Polymers Based on the Appraisal of Available Methods

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Roham Rafiee,
  • Hirad Amohaji,
  • Hedi Khezma

摘要

Additive manufacturing has gained significant attention from researchers due to its ability to produce complex geometries, reduce material waste, and high customization. In this research, a new failure criterion is initially developed for transversely isotropic materials under the assumption of plane stress. An appropriate empirical factor was introduced into the model through trial and error. Subsequently, using experimental data from open literature that the build orientation was upright/on-edge, the tensile strengths of 3D printed parts at various printing angles are validated against existing theories. It is observed that the developed failure criteria can predict strengths for four different datasets with acceptable accuracy. Next, the developed model is utilized to predict the transition angle. Validating the transition angles prediction, another dataset is used for various thicknesses of 0.4, 0.5, and 0.6 mm. Based on the fracture surface images, it is observed that the developed model predicts the transition angle with higher accuracy compared to other existing theories. Moreover, ABS and PLA samples are 3D printed with a layer thickness of 0.1 mm and flat build orientation with various printing angles, and their strengths are measured by tensile tests. The strengths of the testing specimens are also estimated using available theories and developed failure criteria. It is observed that the developed model for both materials provides the highest accuracy after the bilinear model. It was also found that the developed model is capable of predicting strength in different orientations, even for thicker layer configurations where experimental data exhibit nonlinear behavior. This indicates that the model can accurately predict strength with high precision in such cases.