If the glass transition temperature of PMMA is about 104 degree C, which test de
ID: 523755 • Letter: I
Question
If the glass transition temperature of PMMA is about 104 degree C, which test depicted in Fig. 6 corresponds to a sample whose temperature was the furthest below T_g a) Test # 1 (b) Test # 2 (c) Test # 3 (d) Test # 4 (e) None (all are above T_g) Fig. 7 depicts the elastic modulus rules of mixtures for a carbon fiber reinforced epoxy composite. What is the composite modulus, measured parallel to the fiber alignment axis, for a sample containing 60 vol% fiber (a) 10 GPa (b) 15 GPa (c) 20 GPa (d) 25 GPa (e) 30 GPa Fig. 8 depicts four composite plates created by laminating separate sheets of unidirectional Kevlar reinforced polyester. Which of the following laminate configurations would result in a plate with the least anisotropic properties?Explanation / Answer
SOLUTION
Q16) The Pressure corresponding to 60% volume fiber will be = 15GPa as seen from the straight line curve. The 60% volume fiber gives us 15GPa.
Q17) The Figure shown in a) option will show the least anisotropic behaviour as they are alligned at the same angle that is 0* so they will be same throughout in terms of properties and show minimum anisotropic behaviour