V.Give a simple answer to the following questions(10points) 1.(3 pt)What are polymers,homopolymers and copolymers?And another name for polymer is Macromolecules A polymer is a chain like molecule made up of smaller units"monomers".The monomers",made up of atoms,bond together covalently to form a polymer that usually has a carbon backbone. When a polymer is made by linking only one type of monomer together,it is called a homopolymer. When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer 2.(4 pt)Figure 1 is Graphical plot of the tensile modulus of a unidirectional composite material loaded under iso-strain iso-stress conditions as a function of volume fraction of reinforcing fiber. (1)Which curve is the tensile modul s curve under iso-strain loading condition? (2)Draw a sketch to show iso-strain loading. (3)Under iso-strain loading,the modulus of elasticity can be calculated by equation (4)Under iso-stress loading,the modulus of elasticity can be calculated by equation 边E Figure 1 Em 0.25 0.50 0.75 1.0 Volume fraction of fiber (1)A:iso-strain loading,B:iso-stress loading 2 iso-strain loading PDF文件使用“pdfFactory Pro”试用版本创建，fineprint,con,cn 3 Ef Em Te n sile M o d ulu s (E c) 0.5 Volume Fraction of fiber (Vf) Isotrain conditions Isostress conditions Volume fraction of fiber Em Ef A B C o m p osite M o dulus Figure 1 V. Give a simple answer to the following questions (10points) 1. (3 pt) What are polymers, homopolymers and copolymers? And another name for polymer is Macromolecules ? A polymer is a chain like molecule made up of smaller units "monomers". The "monomers", made up of atoms, bond together covalently to form a polymer that usually has a carbon backbone. When a polymer is made by linking only one type of monomer together, it is called a homopolymer. When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer. 2. (4 pt) Figure 1 is Graphical plot of the tensile modulus of a unidirectional composite material loaded under iso-strain & iso-stress conditions as a function of volume fraction of reinforcing fiber. (1) Which curve is the tensile modulus curve under iso-strain loading condition? (2) Draw a sketch to show iso-strain loading. (3) Under iso-strain loading, the modulus of elasticity can be calculated by equation . (4) Under iso-stress loading, the modulus of elasticity can be calculated by equation . (1) A: iso-strain loading, B: iso-stress loading (2) iso-strain loading PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn