Delamination Buckling of Kevlar and Twaron Stitched Glass\Epoxy Composite Laminates by Experiments

2008 ◽  
Vol 136 ◽  
pp. 109-114
Author(s):  
Madusudhanan R. Parlapalli ◽  
Kwok C. Soh ◽  
Dong Wei Shu
Keyword(s):  
Composite Laminates ◽  
Epoxy Composite ◽  
Flexural Modulus ◽  
Vertical Displacement ◽  
Buckling Loads ◽  
Buckling Strength ◽  
Different Types ◽  
Delamination Buckling ◽  
Membrane Strain ◽  
Delamination Length

In the present paper, effects of through-the-thickness stitching of delaminated glass/epoxy composite laminates with two different types of aramid threads, Kevlar® and Twaron® threads, on the buckling loads are studied. The buckling loads are predicted based on the Southwell, Vertical displacement and Membrane strain plot methods from the experimental data. Flexural modulus of the stitched and unstitched glass/epoxy composite laminates, knot tensile strength of Kevlar® and Twaron® stitching threads are obtained experimentally. From the Southwell, Vertical displacement and Membrane strain plot methods it is observed that stitching either by Kevlar® or Twaron® threads is effective in improving the buckling strength of glass/epoxy composite laminates when the delamination length is greater than 0.5L, L is the length of the laminate.

Effects of Delamination on the Critical Buckling Load of Glass Fiber Reinforced Epoxy Composite Plates

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
S. Venkatesh ◽  
S. Prakash ◽  
S. Raja ◽  
S. Manigandan ◽  
P. Sivashankari
Keyword(s):  
Composite Laminates ◽  
Epoxy Composite ◽  
Composite Plates ◽  
Vertical Displacement ◽  
Buckling Load ◽  
Buckling Loads ◽  
Critical Buckling Load ◽  
Finite Element Software ◽  
Aspect Ratios ◽  
Glass Fiber Reinforced

The effects of the delamination in the critical buckling load failure of E-Glass /epoxy composite laminates are analysed. The buckling load of rectangular composite plates is determined by carrying out the experimental work for different aspect ratios of range 2 to 3. The specimens are made with unidirectional fibres of orientation (90/45/-45/0)s. The width of long 100 mm and 50 mm at the centre of the plate, a single substantial delamination is made at the mid layer produced by Teflon film using hand lay-up technique. The buckling loads of plates were found by using simply supported boundary condition and kept the other side edges free. The experimental buckling loads were found from the graph drawn for vertical displacement vs load. By drawing the graph for the vertical displacement vs. load, the experimental buckling load can be calculated. Using finite element software of ANSYS 10, the experimental results were validated.

scholarly journals Improving flexural and dielectric properties of carbon fiber epoxy composite laminates reinforced with carbon nanotubes interlayer using electrospray deposition

2020 ◽  
Vol 9 (1) ◽  
pp. 1170-1182
Author(s):  
Muhammad Razlan Zakaria ◽  
Hazizan Md Akil ◽  
Mohd Firdaus Omar ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Aslina Anjang Ab Rahman ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Carbon Fiber ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Flexural Modulus ◽  
X Ray Diffraction ◽  
Electrospray Deposition ◽  
Ft Ir ◽  
Carbon Fiber Epoxy

AbstractThe electrospray deposition method was used to deposit carbon nanotubes (CNT) onto the surfaces of woven carbon fiber (CF) to produce woven hybrid carbon fiber–carbon nanotubes (CF–CNT). Extreme high-resolution field emission scanning electron microscopy (XHR-FESEM), X-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared spectroscopy (FT-IR) were used to analyze the woven hybrid CF–CNT. The results demonstrated that CNT was successfully and homogenously distributed on the woven CF surface. Woven hybrid CF–CNT epoxy composite laminates were then prepared and compared with woven CF epoxy composite laminates in terms of their flexural and dielectric properties. The results indicated that the flexural strength, flexural modulus and dielectric constant of the woven hybrid CF–CNT epoxy composite laminates were improved up to 19, 27 and 25%, respectively, compared with the woven CF epoxy composite laminates.

scholarly journals Effects of Stitching on Composite Impact Behaviour and Stiffness

1993 ◽  
Vol 2 (2) ◽  
pp. 096369359300200 ◽  
Author(s):  
P Lee-Sullivan ◽  
L T Seng
Keyword(s):  
Composite Laminates ◽  
Epoxy Composite ◽  
Flexural Modulus ◽  
Damage Pattern ◽  
Impact Behaviour ◽  
Delamination Growth ◽  
Tensile Stiffness ◽  
Better Than

The influence of stitching technique on the damage pattern of impacted glass/epoxy composite laminates was investigated. Two different techniques were evaluated; running-stitching (RS) and cross-stitching (CS) respectively. CS was found to be better than RS in suppressing delamination growth. Even so, the RS laminate was less susceptible to delamination than the unstitched equivalent. Although stitching is beneficial, it causes significant reduction in tensile stiffness but has minimal effects on the flexural modulus.

Unfolding the effects of tuft density on compression after impact properties in unidirectional carbon/epoxy composite laminates

2021 ◽  
Vol 258 ◽  
pp. 113378
Author(s):  
Kundan K. Verma ◽  
C.H. Viswarupachari ◽  
Kotresh M. Gaddikeri ◽  
S. Ramesh ◽  
S. Kumar ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Epoxy Composite ◽  
Impact Properties ◽  
Compression After Impact

scholarly journals Mechanical and Morphological Properties of Bio-Phenolic/Epoxy Polymer Blends

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 773
Author(s):  
Ahmad Safwan Ismail ◽  
Mohammad Jawaid ◽  
Norul Hisham Hamid ◽  
Ridwan Yahaya ◽  
Azman Hassan
Keyword(s):  
Mechanical Properties ◽  
Phase Separation ◽  
Polymer Blends ◽  
Epoxy Polymer ◽  
Flexural Modulus ◽  
Polymeric Materials ◽  
Morphological Properties ◽  
Comparison Results ◽  
Unique Material ◽  
Different Types

Polymer blends is a well-established and suitable method to produced new polymeric materials as compared to synthesis of a new polymer. The combination of two different types of polymers will produce a new and unique material, which has the attribute of both polymers. The aim of this work is to analyze mechanical and morphological properties of bio-phenolic/epoxy polymer blends to find the best formulation for future study. Bio-phenolic/epoxy polymer blends were fabricated using the hand lay-up method at different loading of bio-phenolic (5 wt%, 10 wt%, 15 wt%, 20 wt%, and 25 wt%) in the epoxy matrix whereas neat bio-phenolic and epoxy samples were also fabricated for comparison. Results indicated that mechanical properties were improved for bio-phenolic/epoxy polymer blends compared to neat epoxy and phenolic. In addition, there is no sign of phase separation in polymer blends. The highest tensile, flexural, and impact strength was shown by P-20(biophenolic-20 wt% and Epoxy-80 wt%) whereas P-25 (biophenolic-25 wt% and Epoxy-75 wt%) has the highest tensile and flexural modulus. Based on the finding, it is concluded that P-20 shows better overall mechanical properties among the polymer blends. Based on this finding, the bio-phenolic/epoxy blend with 20 wt% will be used for further study on flax-reinforced bio-phenolic/epoxy polymer blends.

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