Thesmallestradiustowhichafibercanbebentorknottedwithout fracturing is an indicat

Question

Thesmallestradiustowhichafibercanbebentorknottedwithout fracturing is an indication of how easily it can be handled in a manufacturing operation. The handling characteristic of a fiber is particularly important in continuous manufacturing operations, such as filament winding or pultrusion, in which continuous strand rovings are pulled through a number of guides or eyelets with sharp corners. Frequent breakage of fibers at these locations is undesirable since it slows down the production rate.

Using the following relationship between the bending radius rb and the maximum tensile strain in the fiber,

rb = df / 2emax

compare the smallest radii to which various glass, carbon, and Kevlar fibers in Table 2.1 can be bent without fracturing.

Explanation / Answer

Given that the smallest radius to which a fiber can be bent or knotted without fracturing is an of how easily it can be handled in a manufacturing process.
In this process the Handling characteristic is very important .
The breakage of fibers at these locations is undesirable because it slows down the production rate.
rb = df/ 2 emax ----------------------(1)
From the above equation we can say that the bending raius of fibre is inversely proportional to the maximum tensile strength.
The tensile strengths of the carbon, glass and kelvar fibres are shown below.
1. Glass ------------- 3450MPa
2. carbon ------------4127MPa
3. Kelvar ------------ 2757 Mpa
therefore emax(carbon) > emax(glass)> emax(kelvar)
As the radius is inversely proportinal to tensile strength , the order becomes reverse.
rb (carbon)< rb(glass)<rb(kelvar)
carbon fiber has the smallest radius.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.