# Tensile yield strength of fiber reinforced plastic

• drbananas
In summary, the use of fiber reinforced plastics in engineering teams involves the use of stiffer fibers to carry the load and protect the plastic resin. If the stress in the resin exceeds 80 MPa, it will yield, but the presence of fibers restricts its ability to do so. Other configurations may have more complex calculations, and failure at higher stress may occur in a brittle manner.

#### drbananas

Hello! I am in a student-run engineering team that heavily utilizes fiber reinforced plastics, and I am just trying to get a better understanding of FRPs. I am wondering how exactly the fiber reinforces the plastic. Let's say the yield strength of the fiber in the 0 degree tensile direction is 2500 MPa, and the yield strength of the plastic resin is 80 MPa. If a force is applied on the FRP along the 0 degree tensile direction that garners a stress greater than 80 MPa, will the plastic resin yield?

It will yield if the stress in the resin is greater than 80 MPa. In the composite, the stiffer fibres carry more of the load, so the stress in the matrix is less than the nominal applied stress. For unidirectional continuous fibres, it is easy to calculate the applied stress that would give 80 MPa in the matrix. For other configurations, it is more complicated.
In addition, the presence of the fibres physically restricts the ability of the resin to yield plastically. It would probably fail in a brittle manner at higher stress.

trurle

## What is the tensile yield strength of fiber reinforced plastic?

The tensile yield strength of fiber reinforced plastic (FRP) is the maximum stress that the material can withstand before it begins to permanently deform or break. It is a measure of the material's ability to resist tensile forces.

## How is the tensile yield strength of FRP determined?

The tensile yield strength of FRP is typically determined through tensile testing, where a sample of the material is pulled until it reaches its breaking point. The stress and strain data collected during the test is used to calculate the tensile yield strength.

## What factors can affect the tensile yield strength of FRP?

The tensile yield strength of FRP can be affected by several factors, including the type and amount of reinforcement fibers used, the matrix material, the manufacturing process, and any environmental factors such as temperature and humidity.

## How does the tensile yield strength of FRP compare to other materials?

The tensile yield strength of FRP is generally higher than that of traditional materials like wood, steel, and aluminum. However, it can vary greatly depending on the specific composition and manufacturing process of the FRP.

## Why is the tensile yield strength of FRP important?

The tensile yield strength of FRP is an important characteristic to consider in engineering and design applications, as it determines the maximum load that the material can safely withstand. It is also crucial for ensuring the structural integrity and safety of FRP components in various industries such as aerospace, automotive, and construction.