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“The joy of discovery is certainly the liveliest that the mind of man can ever feel”

- Claude Bernard -

Journal Publications
Peer-Reviewed Journal Articles

  1. L. Cheng, J. Bai, and A. C. To, “Functionally graded lattice structure topology optimization for the design of additive manufactured components with stress constraints,” Computer Methods in Applied Mechanics and Engineering, 2018. (in press)

  2. X. Liang, L. Cheng, Q. Chen, Q. Yang, and A. C. To, “A modified method for estimating inherent strains from detailed process simulation for fast residual distortion prediction of single-walled structures fabricated by directed energy deposition,” Additive Manufacturing, 2018. (in press)

  3. L. Cheng, X. Liang, E. Belski, X. Wang, J. M. Sietins, S. Ludwick, and A. C. To, “Natural frequency optimization of variable-density additive manufactured lattice structure: Theory and experimental validation,” Journal of Manufacturing Science and Engineering, vol. 140, 105002, 2018.  

  4. L. Cheng, J. Liu, and A. C. To, “Concurrent lattice infill with feature evolution optimization for additive manufactured heat conduction design,” Structural and Multidisciplinary Optimization, vol. 58, 511-535, 2018.  

  5. J. Liu, A. T. Gaynor, S. Chen, Z. Kang, K. Suresh, A. Takezawa, L. Li, J. Kato, J. Tang, C. C. C. Wang, L. Cheng, X. Liang, and A. C. To, “Current and future trends in topology optimization for additive manufacturing,” Structural and Multidisciplinary Optimization, vol. 57, 2457-2483, 2018.

  6. M. Lynch, M. Mordasky, L. Cheng, and A. C. To, “Design, testing, and mechanical behavior of additively manufactured casing with optimized lattice structure,” Additive Manufacturing, vol. 22, 462-471, 2018.

  7. L. Cheng, J. Liu, X. Liang, and A. C. To, “Coupling lattice structure topology optimization with design-dependent feature evolution for additive manufactured heat conduction design,” Computer Methods in Applied Mechanics and Engineering, vol. 332, 408-439, 2018.

  8. J. Liu, L. Cheng and A. C. To, “Arbitrary void feature control in level set topology optimization,” Computer Methods in Applied Mechanics and Engineering, vol. 324, 595-618, 2017. 

  9. L. Cheng, P. Zhang, E. Biyikli, J. Bai, J. Robbins, and A. C. To, “Efficient design optimization of variable-density cellular structures for additive manufacturing: Theory and experimental validation,” Rapid Prototyping Journal, vol. 23, 660-677, 2017.  

  10. Q. Yang, P. Zhang, L. Cheng, M. Zheng, M. Chyu, and A. C. To, “Finite element modeling and validation of thermomechanical behavior of Ti-6Al-4V in laser metal deposition additive manufacturing,” Additive Manufacturing, vol. 12B, 169-177, 2016.

  11. B. Yang and L. Cheng, “Study of new global optimization algorithm based on the standard PSO,” Journal of Optimization Theory and Applications, vol. 3, 935-944, 2013.

  12. L. Cheng and B. Yang, “Study of a new Global Optimization Algorithm of PSO based on improved very fast annealing simulation method,” Application Research of Computer, 2013.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

  13. D. Hao, L. Cheng, and A. C. To, “Topology optimization for extreme damping design of architectured soft metamaterials,” Computer Methods in Applied Mechanics and Engineering.

  14. L. Cheng and A. C. To, “Part-scale build orientation optimization for minimizing residual stress and support volume for metal additive manufacturing: theory and experimental validation,” Computer-Aided Design.

  15. L. Cheng, X. Liang, J. Bai, Q. Chen and A. C. To, “Experimental investigation for optimal support structure design to reduce residual stress in powder-bed metal additive manufacturing,” Additive Manufacturing.

  16. D. Hao, L. Cheng, and A. C. To, “Distortion energy-based topology optimization design of hyperelastic materials,” Structural and Multidisciplinary Optimization.

  17. X. Liang, Q. Chen, L. Cheng, D. Hayduke, and A. C. To, “Modified inherent strain method for fast prediction of residual deformation in direct metal laser sintered components,” Extreme Mechanics Letters.

  18. Q. Chen, X. Liang, D. Hayduke, J. Liu, L. Cheng, J. Oskin, R. Whitmore, and A. C. To, “An Inherent Strain Based Multiscale Modeling Framework for Simulating Part-scale Residual Deformation for Direct Metal Laser Sintering,” Additive Manufacturing.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

  19. L. Cheng, H. Deng and A. C. To, " Spline-based cooling channel optimization for maximization of heat transfer," (In preparation)

  20. L. Cheng, H. Deng and A. C. To, "Functional lattice structure topology optimization for force convection heat transfer," (In preparation)

Submitted Journal Articles under Review
Journal Articles in preparation
Conference Publications

  1. X. Liang, Q. Chen, L. Cheng, Q. Yang and A. C. To, “A modified inherent strain method for fast prediction of residual deformation in additive manufacturing of metal parts,” Proceedings of the Solid Freeform Fabrication, 2539-2545, 2017.

  2. L. Cheng, E. Belski, S Ludwick, J. Oskin, and A. C. To, “Lattice structure topology optimization for lightweight additive manufacturing design: experimental validation and dimensional accuracy,” American Society for Precision Engineering, 2016.

  3. L. Cheng, P. Zhang, E. Biyikli, J. Bai, S. Pilz, and A. C. To, “Integration of topology optimization with efficient design of additive manufactured cellular structures,” Proceedings of the Solid Freeform Fabrication,1370-1377, 2015.

Patent

  1. Lattice Structure Design Optimization Software. University of Pittsburgh, Pittsburgh, USA. (#03659, 2015 A. C. To, L. Cheng, P. Zhang, E. Biyikli, J. Bai)

Presentations

  1. Q. Chen, L. Cheng, J. Liu, X. Liang, and A. C. To, “Laser scan pattern and build orientation optimization for laser powder bed fusion,”  2018 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 13-15, 2018.

  2. X. Liang, R. Zou, L. Cheng, Q. Chen, K. Chen, and A. C. To, “A modified inherent strain theory for fast prediction of residual stress and deformation for laser metal additive manufacturing,” 2018 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 13-15, 2018.

  3. L. Cheng and A. C. To, “Support structure design optimization for metal additive manufacturing via fast process simulation,” Sandia Topology Optimization Roundtable, Washington D.C., February 20-21, 2018. 

  4. L. Cheng, X. Liang, Q. Chen, and A. C. To, “Physics-based support structure design optimization via fast process simulation and lattice structure optimization,” 2018 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 13-15, 2018.

  5. L. Cheng, K. Laux, M. Lynch, K. Saviers, and A. C. To, “Efficient topology optimization of variable-density lattice structure for convective heat transfer,” 2018 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 13-15, 2018.

  6. H. Deng, L. Cheng, A. C. To, and D. Hayduke “Topology optimization of hyperelastic lattice structures that exhibit negative stiffness behavior,”  13th World Congress on Computational Mechanics, New York, NY, July 22-27, 2018.

  7. X. Liang, R. Zou, L. Cheng, Q. Chen, K. Chen, and A. C. To, “Modified inherent strain theory for metal additive manufacturing process with experimental validation using embedded optical fiber,”  13th World Congress on Computational Mechanics, New York, NY, July 22-27, 2018.

  8. L. Cheng, X. Liang, and A. C. To, “Fast process modeling based support structure design optimization for metal additive manufacturing,”  13th World Congress on Computational Mechanics, New York, NY, July 22-27, 2018.

  9. L. Cheng and A. C. To, “Topology optimization of variable-density lattice structure for highly efficient convective heat transfer,” 2017 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 7-9, 2017.

  10. L. Cheng and A. C. To, “Efficient Design of Additive Manufactured Lattice Structures by Integrating Micromechanics Modeling and Topology Optimization,” 2017 RAPID + TCT Conference, Pittsburgh, PA, May 8-11, 2017. (poster)

  11. X. Liang, Q. Chen, L. Cheng, Q. Yang, and A. C. To, “A modified inherent strain method for fast prediction of residual deformation in additive manufacturing of metal parts,” 2017 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 7-9, 2017.

  12. Q. Chen, X. Liang, L. Cheng, J. Oskin, Q. Yang, and A. C. To, “Thermomechanical analysis of direct metal laser melting via line heat source model,” 2017 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 7-9, 2017.

  13. L. Cheng and A. C. To, “Lattice structure topology optimization with design-dependent movable features for heat conduction design,” 14th US National Congress of Computational Mechanics, Montreal, Canada, July 17-20, 2017.

  14. L. Cheng, E. Belski, S Ludwick, J. Oskin, A. C. To, “Lattice Structure Topology Optimization for Lightweight Additive Manufacturing Design: Experimental Validation and Dimensional Accuracy,” American Society for Precision Engineering, 2016.

  15. Q. Yang, P. Zhang, L. Cheng, M. Zheng, M. Chyu, A. C. To, “Finite element modeling and validation of thermal-mechanical behavior of additive manufacturing of Ti-6Al-4V,” 2016 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 8-10, 2016.

  16. L. Cheng, J. Liu, and A. C. To, “Topology optimization for hybrid manufacturing,” 2016 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 8-10, 2016.

  17. L. Cheng, and A. C. To,  “Lattice structured topology optimization of heat conduction for additive manufacturing,” 2016 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 8-10, 2016.

  18. L. Cheng, P. Zhang, E. Biyikli, J. Bai, and A. C. To, "Developing optimization tools that enable efficient design of additive manufactured cellular structures,” The 1st TMS summit on Integrated Manufacturing & Materials Innovations Conference, Pittsburgh, PA, November 15-18, 2015.

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