Molding Process
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Product impact strength has directionality
Problem Phenomenon
The impact strength is extremely low along one direction and very high in the perpendicular direction, showing strong anisotropy
Cause Analysis
Along the fiber orientation direction: stress concentration at fiber ends induces crack propagation; perpendicular to the fiber direction: fibers play a bridging role in blocking crack propagation
Solution
Optimize the gate so that fiber orientation is as perpendicular to the main impact direction as possible; reduce fiber content or reduce the fiber aspect ratio to weaken directionality
Key Takeaway
The directionality of impact strength is a factor that must be considered in LGFPP structural design
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