Aramid Reinforced Polymer Composites Case Study

1. The choice of materials and reason.
 Dispersed phase:
1. Carbon fiber reinforced polymer composites (CFRPs)
2. Aramid reinforced polymer composites (ARPCs)
3. Glass fiber reinforcement composites (GFRs)

**In each case the fiber is encased in a resin matrix (the continuous phase).
**These matrices are usually acrylicepoxyphenolic or polyester resins.

Reason for the selection:
Because carbon fiber is light and able to increase the strength of the tennis rackets.
Reinforcement had impact resistance, stiffness and tensile properties.
It improves fatigue life and corrosion resistance.

 Matrix phase:
The first of these composite materials consisted of glass fibers held within a polyester resin matrix, and later rackets went on to encompass

How to test the quality of the parts manufactured.
The important properties/ parameter of tennis racket to be examined are tensile strength, stiffness and pattern density.

 The head size of the tennis rackets provides the desired power. A larger head provides more power (longer head) or a better control (wider head).
 The beam size (racket 's cross section) influences the racket 's stiffness and power.
 Most modern racket frames are made from light-weight graphite or graphite composites allowing good frame flexibility, more power or more control, depending on the shots.
 Other important aspect refers to how racket’s weight and its distribution affect balance and control.

A. String testing – tensile testing
- Tests are performed to measure tensile strength, elongation at break, knot strength and elongation percentage at given loads. The instrument is fitted with a 2kN horn grip.
- Elongation is measured at 45kg force to replicate the ball hitting the strings.
- Knot strength is measured because if this is too low, the string will break.
- Full testing is carried out at regular intervals during processing (1 in 500 samples) plus product is randomly selected for further analysis. Future tests will include a load then relaxation cycle to allow tension loss over time to be

(2017). YouTube. Retrieved 26 November 2017, from https://www.youtube.com/watch?v=QbA39s0dznQ
Stringing a racquet on the Klippermate Racquet Stringing Machine. (2017). YouTube. Retrieved 26 November 2017, from https://www.youtube.com/watch?v=dH1ni6XavpM
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(2001, March 26). Advanced Materials take on Tennis. Retrieved from https://www.azom.com/article.aspx?ArticleID=216
(2013, July 19). Synthesis, Testing of Nylon 6,6/Multi-wall Carbon Nanotube and Modeling, Analysis of Tennis Racket Frame and String. Retrieved from http://www.worldacademicunion.com/journal/SSCI/SSCIvol07no02paper06.pdf
(2016, June 2). High resolution imaging of impacted CFRP composites with a fiber-optic laser-ultrasound scanner. Retrieved from https://doi.org/10.1016/j.pacs.2016.05.002 (2002, August 7). Tennis Racket - Materials, Design, Evolution and Testing. Retrieved from https://www.azom.com/article.aspx?ArticleID=1559
Ltd., L. (2017). Materials Testing - Advances in String Technology in Sporting Equipment Materials. AZoM.com. Retrieved 23 November 2017, from