Effect of the Gel Coat Composition on the Tensile Strength for Glass Fibre Reinforced Polyester Composites

2015 ◽  
Vol 1125 ◽  
pp. 79-83 ◽  
Author(s):  
Ahmad ◽  
M.R. Abdullah ◽  
Ab. Saman Abd Kadir
Keyword(s):  
Tensile Strength ◽  
Comparative Analysis ◽  
Glass Fibre ◽  
Gfrp Composites ◽  
Composite Surface ◽  
A Value ◽  
Before And After ◽  
Glass Fibre Reinforced ◽  
Polyester Composites ◽  
The Difference

In this study, the effect of the gel coat composition on tensile strength of glass fibre reinforced polyester (GFRP) composites was evaluated. The experiments were conducted on various gel coat composition and time. Samples were immersed in sea and river water for 6 months to investigate the differences in tensile strength. Optical observation using SEM on the composites surface and comparative analysis in terms of tensile strength were used before and after immersing. As results, the most excellent tensile strength was the gel coat composition consisting of 0.3 kg of reolosil QS-102 with 10 kg of resin SHCP 268BQTN with a value of 51.9 MPa. Tensile strength reduced about 33.4 % compared to other sample where reduced to 46.3401 %. The difference in the composite surface as a result of immersion process on each sample was also discussed in this paper.

scholarly journals Machinability Study of Hybrid Nanoclay-Glass Fibre Reinforced Polyester Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
P. Prabhu ◽  
P. Jawahar ◽  
M. Balasubramanian ◽  
T. P. Mohan
Keyword(s):  
Tool Wear ◽  
Glass Fibre ◽  
Microstructural Analysis ◽  
Process Parameter ◽  
Optimum Process ◽  
Machining Parameters ◽  
Twist Drill ◽  
End Mill ◽  
Glass Fibre Reinforced ◽  
Polyester Composites

Glass fibre reinforced polyester composites (GRP) and hybrid nanoclay and glass fibre reinforced polyester nanocomposites (CGRP) are fabricated by vacuum assisted resin infusion technique. The optimum mechanical properties are obtained for CGRP with 3 wt.% nanoclay. Three types of drills (carbide twist drill D 5407060, HSS twist drill BS-328, and HSS end mill (4 flutes “N”-type end mill RH-helical flute)) of 6 mm diameters are used to drill holes on GRP and CGRP. Three different speeds (600, 852, and 1260 rpm) and two different feeds (0.045, 0.1 mm/rev) are selected as process parameters. The effect of process parameter on thrust force and delamination during drilling CGRP is analyzed for optimizing the machining parameters. The delamination factor is low for the optimum process parameter (feed = 0.1 mm/rev and speed 852 rpm). Microstructural analysis confirms that at higher feeds, delamination is low for CGRP drilled with carbide tools. In order to analyze the effect of nanoclay in CGRP on tool wear, 200 holes were drilled on CGRP samples with 3 wt.% nanoclay, and the tool wear is analyzed under optimized parametric condition. Tool wear is high in HSS twist drill compared with carbide drill. The presence of nanoclay also accelerates the tool wear.

scholarly journals Terapi Musik terhadap Depresi pada Lansia

2019 ◽  
Vol 13 (2) ◽  
pp. 72-81
Author(s):  
Theresia Widyastuti
Keyword(s):  
Music Therapy ◽  
Geriatric Depression Scale ◽  
Depression Scale ◽  
Sampling Technique ◽  
The Elderly ◽  
Rank Test ◽  
A Value ◽  
Before And After ◽  
The Difference ◽  
Quasi Experiment

 Depression is a mood disorder that is generally characterized by hopelessness, excessive helplessness, and lack of enthusiasm for life. Starting from stress that is not overcome, then a person can fall into a phase of depression. This study aims to look at the effect of providing music therapy in reducing depression in the elderly before and after being given a commitment. To achieve this goal, this study uses a quasi-experimental method (Quasi Experiment). The type of research design used is Quasi Experiment with one group pretest and posttest design. The sampling technique was purposive sampling where participants based on population criteria obtained a sample of 16 people. Data collection methods using tests with a scale measuring instrument namely Geriatric Depression Scale (GDS) consisting of 30 item questions, observation methods and interview methods .. Based on data analysis it was concluded that the results obtained were Man Whitney Test U = 0.500 with a value of p = 0.001 ( p <0.01) where the mean ranks on the gain score is 12.44 and the sum of ranks is 99.50, this shows the difference in effectiveness of the effects of music therapy before and after treatment and to test the difference in levels of depression before and after being given music therapy using Wilcoxon Sign Rank test analysis . the results obtained z value = -2.539 with a value of p = 0.11 (p <0.01) so that it can be concluded that there are differences in changes in the level of depression in the elderly before and after given treatment.

scholarly journals The interlaminar strength of the glass fiber polyester composite

2009 ◽  
Vol 15 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Slavisa Putic ◽  
Branislav Bajceta ◽  
Dragana Vitkovic ◽  
Marina Stamenovic ◽  
Vladimir Pavicevic
Keyword(s):  
Experimental Investigation ◽  
Glass Fiber ◽  
Glass Fibre ◽  
Polyester Composite ◽  
Glass Fibre Reinforced ◽  
Formation Conditions ◽  
Polyester Composites

The paper outlines the method and the results of the experimental investigation of interlaminar strength of glass fibre reinforced polyester composites, with the aim of determining the influence that the structure, a reinforcement type and a sort of resin exert upon the interlaminar strength. The tested specimens were fabricated under different formation conditions, namely in eight composition patterns and with three sorts of resin used for polymerization.

Fabrication and mechanical characterization of glass fibre reinforced triaxially braided composites

2020 ◽  
pp. 002199832094893
Author(s):  
Gayatri Vineela Marrivada ◽  
Phaneendra Kiran Chaganti ◽  
Ravindran Sujith
Keyword(s):  
Glass Fibre ◽  
Mechanical Characterization ◽  
Research Work ◽  
Braided Composites ◽  
Short Beam ◽  
Beam Shear ◽  
Glass Fibre Reinforced ◽  
The Difference ◽  
Experimental Values

The aim of this research work is to study the mechanical behaviour of dry triaxially braided glass fibre sleeves and its composites experimentally and analytically. The braided glass fibre sleeves for three angles 30°, 45° and 60° were fabricated on a modified maypole vertical braider following a regular braid architecture. Tensile, flexural, short beam shear and impact tests were performed to evaluate the mechanical properties of the composites. A numerical model was developed, which can be used to find the elastic properties and mechanical strength values of the dry braided fabric and its composites. It was observed that the tensile, flexural and interlaminar properties of 30° specimens were more compared to 45° and 60°. The difference between the estimated and experimental values were found to be an average of 8% for tensile moduli and 24% for the tensile strength.

scholarly journals Fishing efficiency of biodegradable PBSAT gillnets and conventional nylon gillnets used in Norwegian cod (Gadus morhua) and saithe (Pollachius virens) fisheries

2018 ◽  
Vol 75 (6) ◽  
pp. 2245-2256 ◽  
Author(s):  
Eduardo Grimaldo ◽  
Bent Herrmann ◽  
Jørgen Vollstad ◽  
Biao Su ◽  
Heidi Moe Føre ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Gadus Morhua ◽  
Plastic Pollution ◽  
Elongation At Break ◽  
Northern Norway ◽  
Before And After ◽  
Polybutylene Succinate ◽  
The Difference ◽  
Catch Rates

Abstract Fishing trials were carried out to compare the relative fishing efficiency of gillnets made of a new biodegradable resin (polybutylene succinate co-adipate-co-terephthalate, PBSAT) with conventional (nylon) nets. The fishing trials covered two consecutive fishing seasons (2016 and 2017) for cod (Gadus morhua) and saithe (Pollachius virens) in northern Norway. Results generally showed better catch rates for the nylon gillnets. The biodegradable PBSAT gillnets caught 50.0% and 26.6% fewer cod, and 41.0% and 22.5% fewer saithe than the nylon gillnets in 2016 and 2017, respectively. Even though the relative catch efficiency of the biodegradable gillnets was slightly better in 2017 than in 2016, the difference with respect to the catch efficiency of nylon gillnets may be too large for biodegradable gillnets to be accepted by fishermen if they were available commercially. Tensile strength measurements of the nylon and biodegradable PBSAT gillnets carried out before and after the fishing trials showed that the both types of gillnets had significant reductions in tensile strength and elongation at break, especially in 2017. Although less catch efficient than nylon gillnets, biodegradable PBSAT gillnets show great potential for reducing ghost fishing and plastic pollution at sea, which are major problems in these fisheries.

scholarly journals PENGARUH TERAPI MUROTTAL TERHADAP TINGKAT KONSENTRASI SISWA KELAS VIII. G DI MTSN 2 MUARA ENIM TAHUN 2018

2019 ◽  
Vol 9 (01) ◽  
pp. 44-48
Author(s):  
Shinta Maharani ◽  
Devy Dwi Putri
Keyword(s):  
Standard Deviation ◽  
Experimental Design ◽  
Average Concentration ◽  
A Value ◽  
Significant Difference ◽  
Before And After ◽  
Quasi Experimental ◽  
The Difference ◽  
The One ◽  
Mean Concentration

One of the tasks of the development of children aged 11-15 years is to think in a more abstract and logical way and more idealistic thinking. This ability to think will be disrupted if teenagers have difficulty concentrating during learning. Therefore we need a method that is fun and can make children relax in learning so that they can concentrate their concentration on ongoing learning. One method that can be used is the Murrotal Al-Qur'an therapy. The aim of the study was to determine whether there was any effect of murottal therapy on the concentration of students at Muara Enim 2 MTsN. This study used a quasi-experimental design with the design of the one group pretest posttest. The sample used was all students of class VIII.G at MTsN 2 Muara Enim. The results showed that the average concentration score of class VIII.G students before Murottal therapy was given was 10.84 with a standard deviation of 3.043. While the average concentration score of class VIII.G students after being given murottal therapy was 17.90 with a standard deviation of 1.233, so that the difference in mean concentration scores before and after murottal therapy was 7.06 with a standard deviation of 1.81. Wilcoxon signed ranks test obtained ρ value = 0,000, with a value of α = 0.05 (p <0.05), this shows that there is a significant difference between the concentration of students before and after being given murottal therapy. It is expected that the school can make a policy about the application of murottal therapy in increasing student concentration.

scholarly journals PELATIHAN MINDFULNESS UNTUK MENURUNKAN TINGKAT STRES PADA SISWI KELAS X

2020 ◽  
Vol 12 (2) ◽  
pp. 159-178
Author(s):  
Ulfa Noor Laili Uswatun Hasanah ◽  
Siti Muthia Dinni
Keyword(s):  
Experimental Research ◽  
Mindfulness Training ◽  
Test Method ◽  
Wilcoxon Test ◽  
Severe Stress ◽  
A Value ◽  
Stress Levels ◽  
Before And After ◽  
The Difference ◽  
Research Type

This study aims to determine the effect of mindfulness training to reduce the stress levels of 7 students in SMK X Pundong who have moderate to severe stress levels. The stress level was measured using the DASS scale. This research is categorized into experimental research type with one group pretest-posttest design. The data obtained were then analyzed using the non-parametric Wilcoxon test method to see the difference between students’ stress levels before and after the intervention through the IBM SPSS Statistics 25 for windows program. The results showed that there were significant differences in students’ stress levels before and after the intervention was given with a value of p = 0.018 (p <0.05). This proves that mindfulness training can reduce the stress levels of students in class X.

scholarly journals Effect of Health Education Demonstration Method and Leaflet Media about Consciousness on Knowledge and Attitude of Hormonal KB Acceptors

2019 ◽  
Vol 7 (1) ◽  
pp. 60-67
Author(s):  
Sri Mulyati ◽  
Winancy Winancy
Keyword(s):  
Breast Cancer ◽  
Health Education ◽  
Hormonal Contraception ◽  
Average Value ◽  
Knowledge And Attitudes ◽  
A Value ◽  
Before And After ◽  
The Difference ◽  
Knowledge And Attitude ◽  
Self Examination

Breast cancer is a disease with characterized by uncontrolled development of cells and breast tissue. Women who has to use acceptors Hormonal contraception (Hormonal KB) has a risk of developing breast cancer. Self Breast Examination (BSE) or Periksa Payudara Sendiri (SADARI) is one of the easier and more efficient ways to be able to detect breast abnormalities by yourself. The purpose of the study was to determine the effect of health education by demonstration methods and leaflet media on breast self-examination of the knowledge and attitudes of WUS hormonal family planning acceptors about SADARI. This study was a quasi experiment: pretest-posttest design. The population was divided into 3 groups, namely groups given health education with leaflets, with demonstration methods, and a combination of leaflets + demonstrations. The results showed that the knowledge and attitudes of respondents before and after health education with leaflet media, demonstration methods, and leaflet + demonstration media combinations experienced a significant increase with a value of p <0.05 (p = 0,000). The increase score in the value of the average rating of knowledge was statistically significant in the demonstration group better than the leaflet group. The difference in the average value of the demonstration and demonstration group rankings + leaflets is not meaningful.  

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