scholarly journals Influence of Maleic-Anhydride Polypropylene on Transverse Cracking in Glass Fibre-Reinforced Polypropylene Cross-Ply Laminates

1994 ◽  
Vol 3 (5) ◽  
pp. 096369359400300 ◽  
Author(s):  
M.J.A. van den Oever ◽  
T. Peijs
Keyword(s):  
Maleic Anhydride ◽  
Glass Fibre ◽  
Saturation Level ◽  
Shear Lag ◽  
Transverse Cracks ◽  
Damage State ◽  
Transverse Cracking ◽  
Glass Fibre Reinforced ◽  
Polypropylene Matrix ◽  
Fibre Matrix

This study investigates the influence of improved adhesion, resulting from maleicanhydride modification of the polypropylene matrix, on transverse cracking in 0/906/0 glass fibre-reinforced polypropylene laminates. It was shown that the characteristic damage state in cross-ply polypropylene/glass laminates, i.e. the saturation level of transverse cracks, is independent of fibre-matrix adhesion and corresponds very well with a predicted value using a shear-lag analysis.

A Damage Model Containing Delamination in Composite Laminates

2006 ◽  
Vol 324-325 ◽  
pp. 43-46
Author(s):  
Yu Pu Ma ◽  
Xin Zhi Lin ◽  
Qing Fen Li ◽  
Zhen Li
Keyword(s):  
Composite Laminates ◽  
Damage Model ◽  
Laminated Composite ◽  
Shear Lag ◽  
Analysis Model ◽  
Transverse Cracks ◽  
Transverse Cracking ◽  
Stiffness Reduction ◽  
Laminated Composite Materials ◽  
Modulus Reduction

When stress is high, delaminate damage can be induced by transverse cracks. A complete parabolic shear-lag damage model containing delamination induced by transverse cracks is therefore proposed and applied to predict the stiffness reduction by transverse cracking in cross-ply laminated composite materials. The predictions of the complete parabolic shear-lag analysis model, the incomplete parabolic shear-lag analysis model, and the complete parabolic shear-lag damage model containing delamination proposed in this paper have been compared. Results show that the young’s modulus reduction values obtained by our analysis model are better agreement with the experimental ones than other models.

Interfaces in Alfa Fibre-Polypropylene Matrix Composites

2008 ◽  
Vol 587-588 ◽  
pp. 227-231
Author(s):  
M.C. Paiva ◽  
Anissa El Gaied ◽  
R.Ben Cheikh ◽  
António M. Cunha
Keyword(s):  
Maleic Anhydride ◽  
Plasma Treatment ◽  
Test Method ◽  
Matrix Composites ◽  
Air Plasma ◽  
Fragmentation Test ◽  
Characterization Studies ◽  
Polypropylene Matrix ◽  
Air Plasma Treatment ◽  
Fibre Matrix

Model composites with Polypropylene (PP) as matrix and alfa fibres (cellulose-based fibres obtained from the esparto grass of the subsaarian dry regions of Tunisia) were prepared for fibre/matrix interfacial characterization studies. The matrices tested were PP and PP combined with PP modified with maleic anhydride (PP-g-MA). The surface of the alfa fibres was treated by air plasma treatment. The adhesion between the untreated and treated fibres and both matrices was studied using the fragmentation test method. Composites with 10% weight of fibres were prepared by melt extrusion and injection moulding, and the specimens obtained tested for tensile properties. The fracture surfaces of the composites, obtained at low temperature, were observed by scanning electron microscopy. The presence of a small concentration of maleic anhydride grafted to the polymer matrix was found to be of the utmost importance for the establishment of a good fibre/matrix interface. The air plasma treatment had a cleaning effect of the fibre’s surface.

scholarly journals Application of the Equivalent Constraint Model to Investigate Stiffness Properties of Transversally Cracked and Split Frp Laminates

1999 ◽  
Vol 8 (5) ◽  
pp. 096369359900800 ◽  
Author(s):  
M. Kashtalyan ◽  
C. Soutis
Keyword(s):  
Matrix Cracking ◽  
Shear Lag ◽  
Transverse Cracks ◽  
New Approach ◽  
Shear Lag Model ◽  
Transverse Cracking ◽  
Stiffness Properties ◽  
Lag Model ◽  
Equivalent Constraint Model ◽  
Constraint Model

A new approach based on the Equivalent Constraint Model (ECM) [ 1 ] of the damaged lamina is applied to investigate the stiffness degradation in [0m/90n]s laminates due to matrix cracking both in the 90° (transverse cracking) and 0° (splitting) plies. The advantage of the approach is that it avoids cumbersome consideration of a repeated laminate element defined by the intersecting pairs of transverse cracks and splits, intrinsic to the earlier developed models [ 2 – 6 ]. Instead, two coupled problems for ECM laminates are solved. The stress field in the damaged lamina is determined by means of an improved 2-D shear lag analysis, and the reduced stiffness properties are described with the help of Insitu Damage Effective Functions, for which closed form expressions are obtained. Comparison of the new ECM/2-D shear lag model with the earlier developed models shows a reasonable agreement.

scholarly journals Interfacial Fracture in Fibre-Metal Laminates Based on Glass Fibre Reinforced Polypropylene

1998 ◽  
Vol 7 (4) ◽  
pp. 096369359800700 ◽  
Author(s):  
G. Reyes ◽  
W.J. Cantwell
Keyword(s):  
Maleic Anhydride ◽  
Fracture Energy ◽  
Glass Fibre ◽  
Loading Rate ◽  
Interfacial Fracture ◽  
Fracture Properties ◽  
Glass Fibre Reinforced ◽  
Fibre Metal ◽  
Fibre Metal Laminate ◽  
Excellent Adhesion

This papers examines the interfacial fracture properties of a new fibre-metal laminate based on glass fibre reinforced polypropylene (GFPP). Tests have shown that excellent adhesion between aluminium and GFPP can be achieved by incorporating a maleic-anhydride modified polypropylene interlayer between the composite and aluminium layers. Single cantilever beam tests have shown that the fracture energy of these systems initially increases with loading rate and then decreasing. In spite of this, the fracture energy is extremely high at all rates.

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