Impact Behaviour and Damage Analysis of Laminated Composites Made of Glass Fibres/Nano-Reinforced Thermoplastic Matrix

2019 ◽  
pp. 325-334
Author(s):  
Napo Bonfoh ◽  
Rodrigue Matadi Boumbimba ◽  
Gbèssiho Kinvi-Dossou ◽  
Mamadou Coulibaly
Keyword(s):  
Laminated Composites ◽  
Damage Analysis ◽  
Impact Behaviour ◽  
Glass Fibres ◽  
Thermoplastic Matrix

Progressive Fatigue Damage Simulation in Laminated Composites Based on Explicit Finite Element Formulation

2019 ◽  
Vol 64 (2) ◽  
pp. 1-12
Author(s):  
Yuri Nikishkov ◽  
Guillaume Seon ◽  
Andrew Makeev
Keyword(s):  
Finite Element ◽  
Laminated Composites ◽  
Test Methods ◽  
Remaining Useful Life ◽  
Image Correlation ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Explicit Finite Element ◽  
Analysis Methods ◽  
Open Hole

Advanced polymeric composites are playing a major role in designing high-performance and lightweight vertical lift structures. However, uncertain residual strength and remaining useful life of the composite rotor and airframe structures due to complexity of failure mechanisms and susceptibility to manufacturing irregularities, which may be precursors to structural damage, impose risks that cannot be mitigated exclusively by time-consuming and costly experimental iterations. Validated analysis techniques accelerating design, certification, and qualification of composite structures are needed. Our team has been taking essential steps toward improving confidence in material qualification for laminated composites. The first step started with our reduced lamina test methods, short-beam shear, and small-plate twist based on digital image correlation measuring as a subset the standard material properties and, in addition, key properties that cannot be currently measured using any standard test methods. The lamina properties provide essential material input data for laminate analysis. The laminate analysis was the second step increasing confidence in material qualification. A known weakness of the existing progressive damage analysis methods is the lack of effective techniques to predict ultimate failure. The newly developed methodology relies on explicit finite element modeling and eliminates convergence issues in the ply-level progressive damage analysis methods due to severe nonlinear discontinuities after propagation of damage beyond detectable size. This work shows results of applying this methodology to nanosilica-toughened IM7/PMT-F3GHT open-hole tension strength/fatigue, open-hole compression strength/fatigue, and bearing strength multidirectional laminate configurations. The ability to predict progression of damage from initiation to ultimate strength and fatigue for advanced material systems including IM7/PMT-F3GHT carbon/epoxy reinforced by nanosilica has been demonstrated for the first time.

Study of mode II interlaminar fracture toughness of laminated composites of glass and jute fibres in epoxy for structural applications

2021 ◽  
Vol 3 (4) ◽  
pp. 044002
Author(s):  
Pankaj Singh Chandel ◽  
Y K Tyagi ◽  
Kanishk Jha ◽  
Rajeev Kumar ◽  
Shubham Sharma ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Laminated Composites ◽  
Curing Temperature ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Three Point Bending ◽  
Glass Fibres ◽  
Structural Applications ◽  
Delamination Resistance

Abstract Composites are being used in the place of metals in many industries as they have a lower density and are cheaper than metals. In aerospace industries there is requirement for light weight together with strength, and reinforced fibre composites are superior in some critical properties compared with metals. In this study, laminated composites were fabricated with woven E-glass and jute fibres in an epoxy matrix by a hand layup method. The samples were prepared as per the relevant the America Society for Testing ad Materials (ASTM) standard and tested for mode II interlaminar fracture toughness to investigate delamination resistance. Mode II interlaminar fracture toughness was evaluated by an end-notched flexure test using three-point bending. The fracture toughness G IIC was calculated for a curing temperature range from 40 °C to 70 °C at intervals of 5 °C for different sets of laminated composites. The investigations revealed that when the curing temperature of laminated composites was increased from 40 °C to 70 °C, the interlaminar fracture toughness G IIC was increased in neat woven E-glass laminated composites, decreased in neat jute laminated composites, significantly increased in laminated composites with woven E-glass fibres in compression and jute fibres in tension and slightly increased when woven E-glass fibres were kept in tension and jute fibres in compression.

scholarly journals Fibre Reinforced Thermoplastic Composite Rods

2012 ◽  
Vol 730-732 ◽  
pp. 331-336 ◽  
Author(s):  
Veronika Kling ◽  
Sohel Rana ◽  
Raul Fangueiro
Keyword(s):  
Mechanical Properties ◽  
Optical Microscopy ◽  
Cross Section ◽  
High Performance ◽  
Thermoplastic Composite ◽  
The Core ◽  
Glass Fibres ◽  
Thermoplastic Matrix ◽  
Innovative Technique ◽  
The Cross

The present investigation is concerned with the development of fibre reinforced thermoplastic composite rods using braiding process. An innovative technique has been developed to produce composite rods with outer braided layer of polyester fibres and axially reinforced with high performance glass fibres. Polypropylene filaments which were introduced in to the core along with the glass fibres during the braiding process formed the thermoplastic matrix upon melting. A special mould has been designed for uniform application of heat and pressure during the consolidation of the composite rods as well as for the alignment of core fibres. The cross-section of composite rods was characterized with help of optical microscopy in order to see the distribution of core fibres and matrix. The effect of amount of glass fibres on the mechanical properties (tensile and flexural) of composite rods has been investigated and discussed.

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