8576
Maximized flexural response was achieved with 0.4893 Carbon Fiber volume ratio , concentric reinforcement and perpendicular to the applied force , resulting in a flexural modulus of 14.17 GPa and a proportional limit of 231.1 MPa .
 Carbon Fiber, reinforcement, force, GPa, proportional limit, MPa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 Carbon Fiber, reinforcement, force, GPa, proportional limit, MPa