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For tension coupon tests of GFRP, do we have to conduct test on lamina(single ply) or laminates (number of plies) ??

Hello, I have a project concerning the fabrication of a Glass Reinforced Epoxy composite bar. Can you please advise me where I can find the standards related to it? I would appreciate it a lot. Thanks in advance.

@engineeringmaterials-tribo5142

Жыл бұрын

The ASTM provides such standards. One that we used was ASTM D3039. It is mentioned in the beginning of the video at 00:30 s.

What kind of cloth was used? How many plies? How were the fibres oriented?

@engineeringmaterials-tribo5142

2 жыл бұрын

Cross-ply fabric. Do not remember how many plies of such cloth. Sorry, quite old work now.👍

so i am doing my M.tech final year project in bamboo fiber epoxy composite material. I have few question 1. what is the ASTM standard for tensile test for a 1.3 mm bamboo strip ? People consider single bamboo fiber for single fiber test. I am taking a 1.3 mm circular cross section bamboo strip or i can say bundle of bamboo fiber. So is there any ASTM standard for bamboo strip tensile test? As the bamboo strip itself is a composite (lignin,cellulose,hemicellulose) so can i use ASTM 3039, ASTM 638 all these standard? 2. in the ASTM standard why people always take 3mm thickness of the specimen? In ASTM 3039 it is mentioned that the size of the specimen is (minimum length= gripping+ 2 times width+ gauge length) and thickness is mentioned as (as needed). so Can i use 5 mm thick specimen(bamboo fiber epoxy composite)?

@engineeringmaterials-tribo5142

2 жыл бұрын

1. As far as I know, there is no separate ASTM standard test for bamboo strips. You may also check. The bamboo fibres have to be separated and then bonded together with epoxy matrix. There is a process of alkali treatment which is shown in this video. This is to remove the lignin and use only cellulose fibre for composite making. Cellulose fibre is the part which has high strength property. Yes you can use the ASTM3039 standard once you have made bamboo fibre/epoxy composite. 2. Thickness can be kept 5 mm or some other convenient thickness. Thickness often depends upon how you make the composite and also on the application. 👍

How the tensile strength of flax fiber sheet impregnated with araldite can be found out?

@engineeringmaterials-tribo5142

Жыл бұрын

Please follow the same testing procedure as shown in this video. It also mentions the ASTM standard for testing plastic composites.

What is the dimension of the sample you prepared? (LengthXWidthXThickness)

@engineeringmaterials-tribo5142

2 жыл бұрын

Gauge length was kept 3 inches, width 25 mm and thickness was 3mm. You can see the ASTM standards to decide about sample dimensions. 👍👍

what is the Influence of an elevated temperature on tensile strength of glass fiber- reinforced polymer composites

@engineeringmaterials-tribo5142

3 ай бұрын

Good question. For any polymeric material, increasing temperature means reduction in tensile strength. This will happen very drastically. Even within a day or during seasonal changes from winter to summer, you can observe this change. For glass fibre reinforced composite, the same will happen but some what delayed effect. That means GFRP will be able to retain its strength at a higher temperature than the pure plastic. You will need to generate data if you want to know quantitative answer. Please do check in books or research papers.

Is this standard used for the sandwich type of composite material?

@engineeringmaterials-tribo5142

Жыл бұрын

It can be used as long as it is tensile strength. The composite we used was also sandwich of woven fabric of glass fibre in epoxy.

Hello, how testing after application of GFRP on concrete?.

@engineeringmaterials-tribo5142

11 ай бұрын

I am not aware of a standard of GFRP reinforced concrete. What I can say is ASTM D7957/D7957M-17 can be used as Standard Specification For Solid Round Glass Fiber Reinforced Polymer Bars For Concrete Reinforcement. Standard D7205/D7205M − 06 also provides for the same application.

Where i contact you regarding this testing i want to ask my query

@engineeringmaterials-tribo5142

8 ай бұрын

you may kindly ask here in this comment section.

Hello my project is on basalt fiber reinforced composites do i have to use the same ASTM standards for my test piece

@ameramer2523

8 ай бұрын

And also what do you mean by volume percentage 70 of fiber can you explain it elaborately please

@engineeringmaterials-tribo5142

8 ай бұрын

% can be calculated as weight % and also as volume %. For composites, always use volume %. This means 70% of the volume of the whole composite is the fibre.

@engineeringmaterials-tribo5142

8 ай бұрын

preferably use same ASTM for continuous fibre composite. If short fibre composite then please check if ASTM has another standards for that.

Sir can you tell, how much time aGlass fiber reinforced polyester takes to fail after starting the crosshead movement?

@engineeringmaterials-tribo5142

Жыл бұрын

We tested epoxy based composite. I can't tell how much time polyester composite will take. I would say that it will take similar time if it is thermoset polyester as all thermosets have similar kind of strain value at failure. This value can be defined by the ductility ratio.

@rdtechie5244

Жыл бұрын

Sir you can even tell about epoxy based, I have to run simulation by considering the time span of the test running till failure. Kindly tell me about it.

@engineeringmaterials-tribo5142

Жыл бұрын

@@rdtechie5244 Please caculate the time in the video. The cross-head speed is also mentioned. The video is in real time so you should be able to get.

@rdtechie5244

Жыл бұрын

@@engineeringmaterials-tribo5142 Thankyou so much Sir!

What's fracture stress?

@engineeringmaterials-tribo5142

7 ай бұрын

The final stress a specimen can withstand before fracture initiates. In a tensile stress-strain curve it should be the highest point on the stress axis.