Predictive Engineering Tools for Injection-molded Long-fiber Reinforced Thermoplastic Composites

National Laboratory: 
Pacific Northwest National Laboratory
Computational Tools Class: 
Materials Processing
Processing/Manufacturing Class: 
Shaping and forming
Thermo-mechanical processing

PNNL's capability allows for integrated use of state-of-the-art processes and constitutive models to calculate tensile and flexural stiffness properties of injection-molded long-fiber thermoplastic (LFT) composite components based on predicted fiber orientation and length distributions.

Capability Bounds: 

This capability uses commercial and in-house developed software to predict long glass or long carbon fiber orientation and length distribution in injection molded parts, as well as the resulting component mechanical performance.

Unique Aspects: 

Techniques have been developed, demonstrated, and validated for long glass fiber and long carbon fiber thermoplastic composites.


Use typically is coordinated with capability experts and via collaborative funding proposals or contracts.

Single Point of Contact: 

Name: Darrell Herling
Phone: 509-375-6908

  1. Nguyen BN, Bapanapalli S, Holbery JD, Smith MT, Kunc V, Frame BJ, Phelps JH, and Tucker III CL. 2008. 'Fiber Length and Orientation Distributions in Long-Fiber Injection-Molded Thermoplastics -Part I: Modeling of Microstructure and Elastic Properties.' Journal of Composite Materials, 42:1003-1029.
  2. Nguyen BN and V Kunc. 2010. 'An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics.' Int. J. Damage Mech., 19:691-725.
  3. Nguyen BN, SK Bapanapalli, V Kunc, JH Phelps, and CL Tucker, III. 2009. 'Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics.' Journal of Composite Materials, 43:217-246.
  4. Kunc V, BJ Frame, BN Nguyen, CL Tucker III, and G. Velez-Garcia. 2007. 'Fiber Length Distribution Measurement for Long Glass and Carbon Fiber Reinforced Injection Molded Thermoplastics.' In: Proceedings of the 7th Annual SPE Automotive Composites Conference & Exposition, Society of Plastics Engineers.
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