scholarly journals Preparation and properties of polyamide-6-based thermoplastic laminate composites by a novel in-mold polymerization technique

2013 ◽  
Vol 131 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Nadya Dencheva ◽  
Ana S. Sampaio ◽  
Filipa M. Oliveira ◽  
António S. Pouzada ◽  
Antonio M. Brito ◽  
...  
Keyword(s):  
Polyamide 6 ◽  
Laminate Composites

scholarly journals Mechano-morphological studies of polyamide 6 based single polymer laminate composites prepared by different reactive processing techniques

2019 ◽  
Vol 79 ◽  
pp. 106017
Author(s):  
Shafagh Dinparast Tohidi ◽  
Zlatan Z. Denchev ◽  
Ana Maria Rocha ◽  
Nadya V. Dencheva ◽  
Bernhard Engesser ◽  
...  
Keyword(s):  
Polyamide 6 ◽  
Reactive Processing ◽  
Laminate Composites ◽  
Morphological Studies ◽  
Processing Techniques

scholarly journals Microstructural-mechanical properties relationship in single polymer laminate composites based on polyamide 6

2018 ◽  
Vol 153 ◽  
pp. 315-324 ◽  
Author(s):  
Shafagh D. Tohidi ◽  
Ana Maria Rocha ◽  
Nadya V. Dencheva ◽  
Zlatan Denchev
Keyword(s):  
Mechanical Properties ◽  
Polyamide 6 ◽  
Laminate Composites

scholarly journals Influence of transcrystalline layer on finite element mesoscale modeling of polyamide 6 based single polymer laminate composites

2020 ◽  
Vol 232 ◽  
pp. 111555 ◽  
Author(s):  
Shafagh D. Tohidi ◽  
Ana Maria Rocha ◽  
N. Dourado ◽  
Mohammadali Rezazadeh ◽  
Nguyễn T. Quyền ◽  
...  
Keyword(s):  
Finite Element ◽  
Polyamide 6 ◽  
Mesoscale Modeling ◽  
Laminate Composites ◽  
Transcrystalline Layer

Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

1990 ◽  
Vol 48 (4) ◽  
pp. 876-877
Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee
Keyword(s):  
High Pressure ◽  
Carbon Fiber ◽  
Sample Surface ◽  
High Yield ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Peek Composite ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

Determination of the transverse shear stress in layered composites

2020 ◽  
Vol 86 (2) ◽  
pp. 44-53
Author(s):  
Yu. I. Dudarkov ◽  
M. V. Limonin
Keyword(s):  
Shear Stress ◽  
Transverse Shear ◽  
Composite Beam ◽  
Layered Composite ◽  
Equivalent Model ◽  
Shear Stresses ◽  
Transverse Shear Stress ◽  
Layered Composites ◽  
Laminate Composites ◽  
Transverse Shear Stresses

An engineering approach to estimation of the transverse shear stresses in layered composites is developed. The technique is based on the well-known D. I. Zhuravsky equation for shear stresses in an isotropic beam upon transverse bending. In general, application of this equation to a composite beam is incorrect due to the heterogeneity of the composite structure. According to the proposed method, at the first stage of its implementation, a transition to the equivalent model of a homogeneous beam is made, for which the Zhuravsky formula is valid. The transition is carried out by changing the shape of the cross section of the beam, provided that the bending stiffness and generalized elastic modulus remain the same. The calculated shear stresses in the equivalent beam are then converted to the stress values in the original composite beam from the equilibrium condition. The main equations and definitions of the method as well as the analytical equation for estimation of the transverse shear stress in a composite beam are presented. The method is verified by comparing the analytical solution and the results of the numerical solution of the problem by finite element method (FEM). It is shown that laminate stacking sequence has a significant impact both on the character and on the value of the transverse shear stress distribution. The limits of the applicability of the developed technique attributed to the conditions of the validity of the hypothesis of straight normal are considered. It is noted that under this hypothesis the shear stresses do not depend on the layer shear modulus, which explains the absence of this parameter in the obtained equation. The classical theory of laminate composites is based on the similar assumptions, which gives ground to use this equation for an approximate estimation of the transverse shear stresses in in a layered composite package.

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