Validation of New Process Models for Large Injection-Molded Long-Fiber Thermoplastic Composite Structures

Nguyen, Ba Nghiep ; Jin, Xiaoshi ; Wang, Jin ; Kunc, Vlastimil ; Tucker III, Charles L.

关键词: FIBERS;    MOLDING;    ONTARIO;    ORIENTATION;    ORNL;    PROCESSING;    THERMOPLASTICS;    VALIDATION;    COMPOSITE MATERIALS Process modeling;    injection molding;    long-fiber thermoplastic;    fiber orientation;    fiber length distribution;   

DOI  :  10.2172/1035733
RP-ID  :  PNNL-21165
PID  :  OSTI ID: 1035733
Others  :  Other: VT0505000
Others  :  TRN: US201205%%420

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

This report describes the work conducted under the CRADA Nr. PNNL/304 between Battelle PNNL and Autodesk whose objective is to validate the new process models developed under the previous CRADA for large injection-molded LFT composite structures. To this end, the ARD-RSC and fiber length attrition models implemented in the 2013 research version of Moldflow was used to simulate the injection molding of 600-mm x 600-mm x 3-mm plaques from 40% glass/polypropylene (Dow Chemical DLGF9411.00) and 40% glass/polyamide 6,6 (DuPont Zytel 75LG40HSL BK031) materials. The injection molding was performed by Injection Technologies, Inc. at Windsor, Ontario (under a subcontract by Oak Ridge National Laboratory, ORNL) using the mold offered by the Automotive Composite Consortium (ACC). Two fill speeds under the same back pressure were used to produce plaques under slow-fill and fast-fill conditions. Also, two gating options were used to achieve the following desired flow patterns: flows in edge-gated plaques and in center-gated plaques. After molding, ORNL performed measurements of fiber orientation and length distributions for process model validations. The structure of this report is as follows. After the Introduction (Section 1), Section 2 provides a summary of the ARD-RSC and fiber length attrition models. A summary of model implementations in the latest research version of Moldflow is given in Section 3. Section 4 provides the key processing conditions and parameters for molding of the ACC plaques. The validations of the ARD-RSC and fiber length attrition models are presented and discussed in Section 5. The conclusions will be drawn in Section 6.