Transverse behaviour of a unidirectional composite (glass fibre reinforced unsaturated polyester). Part I. Influence of fibre packing geometry

1998 ◽  
Vol 27 (1) ◽  
pp. 13-36 ◽  
Author(s):  
L. Zhang ◽  
L.J. Ernst ◽  
H.R. Brouwer
Keyword(s):  
Glass Fibre ◽  
Unsaturated Polyester ◽  
Unidirectional Composite ◽  
Composite Glass ◽  
Glass Fibre Reinforced ◽  
Fibre Packing

Effects of drilling parameters on delamination of kenaf-glass fibre reinforced unsaturated polyester composites

2021 ◽  
pp. 152808372110620
Author(s):  
AR Ngah ◽  
Suhad D Salman ◽  
Z Leman ◽  
SM Sapuan ◽  
MFM Alkbir ◽  
...  
Keyword(s):  
Glass Fibre ◽  
Feed Rate ◽  
Unsaturated Polyester ◽  
Spindle Speed ◽  
Taguchi Methods ◽  
Drilling Process ◽  
Drill Bit ◽  
Influence Of Process Parameters ◽  
Drill Bits ◽  
Glass Fibre Reinforced

Drilling is a secondary material removal and usually carried out to facilitate fastening of parts together. Drilling of composite materials is not usually a problem-free process. Issues related to delamination composite laminates need to be addressed because it introduces the stress concentration point on the composite. This study focussed on the influence of process parameters such as spindle speed, feed rate, type of drill bits and geometry on the extend of delamination experienced by the composite during the drilling process of kenaf-glass fibre-reinforced unsaturated polyester composite, and the delamination measurements were taken under a microscope. Taguchi methods and analysis of variance were employed to find the optimal parameters. From the results, the most significant parameter was the feed rate. The minimum delamination was achieved when the feed rate was 0.05 mm/rev and spindle speed was 700r/min using both types of drill bits. The quality of the drill hole using the twist drill bit has been proven to be better than the brad drill bit.

scholarly journals Water Absorption Study on Pultruded E-Glass Fibre Reinforced Unsaturated Polyester Composites

2010 ◽  
Vol 19 (3) ◽  
pp. 096369351001900 ◽  
Author(s):  
Hazizan Md Akil ◽  
Leong Wei Cheng ◽  
M. H. Affzan ◽  
A. Abu Bakar ◽  
Z.A. Mohd Ishak
Keyword(s):  
Water Absorption ◽  
Glass Fibre ◽  
Sea Water ◽  
Unsaturated Polyester ◽  
Water Immersion ◽  
Compression Properties ◽  
Glass Fibre Reinforced ◽  
Polyester Composites ◽  
And Diffusion ◽  
Maximum Moisture Content

Glass fibre reinforced unsaturated polyester composites were subjected to water immersion tests in order to study its water absorption behaviour its effects on mechanical properties. Water absorption tests were conducted by immersing composite specimens into three different environmental conditions included distilled water, sea water and acidic solution. Water absorption curves were obtained and diffusion coefficient ( D) and maximum moisture content ( Mm) were determined. The water absorption behaviour of composite was found to follow a so-called Fickian behaviour. The flexural and compression properties were found to decrease with increasing water uptake.

scholarly journals Interacting Blends of Novel Unsaturated Polyester Amide Resin with Vinyl Acetate

2004 ◽  
Vol 1 (5) ◽  
pp. 237-242
Author(s):  
H. S. Patel ◽  
K. K. Panchal ◽  
S. R. Patel ◽  
S. N. Desai
Keyword(s):  
Vinyl Acetate ◽  
Glass Fibre ◽  
Unsaturated Polyester ◽  
Vinyl Monomer ◽  
Diglycidyl Ether ◽  
Mechanical And Electrical Properties ◽  
Fibre Composites ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Composites ◽  
Fibre Reinforced Composites

Novel unsaturated poly (ester- amide) resins (UPEAs) were prepared by the reaction between an epoxy resin, namely diglycidyl ether of bisphenol–A (DGEBA) and unsaturated aliphatic bisamic acids using a base catalyst. These UPEAs were then blended with a vinyl monomer namely, Vinyl acetate (VA) to produce a homogeneous resin syrup. The curing of these UPEAs-VA resin blends was carried out by using benzoyl peroxide (BPO) as an initiator for the radical polymerization and was monitored by using a differential scanning calorimeter (DSC). The glass fibre reinforced composites (i.e. laminates) of these UPEA-VA resin blends were fabricated using the DSC data. The chemical, mechanical and electrical properties of the glass fibre composites have also been evaluated. The unreinforced cured samples of the UPEA-VA resin blends were also analyzed by thermogravimetry (TGA).

scholarly journals The Effects of Some Phosphorus-Containing Fire Retardants on the Properties of Glass Fibre-Reinforced Composite Laminates Made from Blends of Unsaturated Polyester and Phenolic Resins

2021 ◽  
Vol 5 (10) ◽  
pp. 258
Author(s):  
Latha Krishnan ◽  
Baljinder. K. Kandola ◽  
John R. Ebdon
Keyword(s):  
Mechanical Properties ◽  
Glass Fibre ◽  
Composite Laminates ◽  
Mechanical Performance ◽  
Unsaturated Polyester ◽  
Fire Retardant ◽  
Fire Retardants ◽  
Cone Calorimetry ◽  
Glass Fibre Reinforced ◽  
Ul 94

This study investigated the effects of phosphorus fire retardants (FRs) in matrices from co-cured blends of an unsaturated polyester (UP) with inherently fire-retardant phenolic resoles (PH) on the mechanical and flammability properties of resultant glass fibre-reinforced composites. Three different phenolic resoles with UP have been used: (i) an ethanol soluble (PH-S), (ii) an epoxy-functionalised (PH-Ep), and (iii) an allyl-functionalised resin (PH-Al) with two different phosphorus FRs: resorcinol bis (diphenyl phosphate) (RDP) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The flammabilities of the resultant composites were evaluated using cone calorimetry and the UL-94 test. Cone calorimetric results showed reductions in peak heat release rate (PHRR) and total heat released (THR) as expected compared to those of UP and respective UP/PH composite laminates without FRs. UL-94 tests results showed that while all composites had HB rating, FR containing samples self-extinguished after removal of the flame. The mechanical properties of the composites were evaluated using flexural, tensile and impact tests. All FRs reduced the mechanical properties, and the reduction in mechanical properties was more severe in UP/PH-S (least compatible blends) composites with FRs than in UP/PH-Al (most compatible blends) composites with FRs. Amongst the different composites, those from UP/PH-Al with DOPO showed the best fire retardancy with little deterioration of mechanical performance.

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