Quasi-Static and Low-Velocity Impact Behavior of Injection Over-Molded Short/Continuous Fiber Reinforced Polypropylene Composites

Over-molded composites (combination of continuous and short fiber reinforced composites) are materials of choice for production of relatively complex load-bearing structures due to their excellent structural performance, lightweight and lower assembly cost. The quasi-static and low-velocity impact b...

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Bibliographic Details
Published in:Applied composite materials 2023-12, Vol.30 (6), p.2025-2046
Main Authors: Anandakumar, Paramasivam, Timmaraju, Mallina Venkata, Velmurugan, Ramachandran
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Composite materials
Compression tests
Compressive strength
Continuous fiber composites
Delamination
Energy
Fiber reinforced polymers
Flexural strength
Glass fiber reinforced plastics
Impact damage
Impact strength
Industrial Chemistry/Chemical Engineering
Injection molding
Inserts
Interfacial bonding
Laminar composites
Laminates
Layers
Load
Load bearing elements
Materials Science
Modulus of rupture in bending
Peak load
Polymer Sciences
Polypropylene
Short fibers
Static tests
Tensile strength
Thermoplastic composites
Velocity
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Summary:Over-molded composites (combination of continuous and short fiber reinforced composites) are materials of choice for production of relatively complex load-bearing structures due to their excellent structural performance, lightweight and lower assembly cost. The quasi-static and low-velocity impact behavior of over-molded polypropylene composites with continuous fiber face sheets and short fiber core were explored by conducting flexural, drop-weight impact and compression tests. Quasi-static test results revealed that over-molded specimens showed 43% and 33% higher flexural strength and flexural modulus, respectively, compared with short fiber composites. The over-molded composites showed significant improvement of impact peak load and absorbed energy compared with short fiber composites. Optical analysis of failed over-molded impact specimens revealed impact energy-absorption though interface debonding, delamination between plies of the top and bottom inserts and damage of the core. Finally, the laminated composite inserts at top and bottom of short glass fiber reinforced polypropylene lowered the impact damage and produced higher specific compression strength than the short glass fiber reinforced polypropylene.
ISSN:0929-189X
1573-4897
DOI:10.1007/s10443-023-10163-3