in chapter 6. 5.1 W developed over the years,and comprehensive literature surveys have are also used in the literature.Many analytical approaches have been terms"structure-property relationships"and"effective modulus theories" terms of constituent material properties is called"micromechanics."The ites literature,however,the analysis of effective composite properties in "minimechanics"[1].In the present context,and in much of the compos- of composites at the constituent material level should be referred to as to as "macromechanics,"it has been suggested that,perhaps,mechanics the behavior of composite material structures such as laminates is referred of mechanical behavior at the level of molecular or crystal structures.Since "micromechanics."To a materials scientist,the term may imply the study Before proceeding further,it is appropriate to discuss briefly the term of discontinuous fiber composites,including nanocomposites,is covered will be presented in chapter 4 and chapter 5,respectively.Micromechanics responding models for predicting strength and hygrothermal properties tents,and geometric arrangements of the fiber and matrix materials.Cor- in terms of the corresponding material properties,relative volume con- for predicting the effective moduli of continuous fiber-reinforced laminae detail.In this chapter,we will discuss various micromechanical models ever,and the roles of lamina constituent materials were not examined in stress-strain relationships involving the lamina effective moduli,how- concerned with the development and manipulation of macromechanical moduli of an equivalent homogeneous material.Chapter 2 was primarily aged stresses can be related to the volume-averaged strains by the effective volume element(RVE)in a heterogeneous composite,the volume-aver- relationships for composite materials.Recall that for some representative to be essential to the development of practical engineering stress-strain In the previous chapter,the concept of an effective modulus was found Introduction Fiber-Reinforced Lamina Effective Moduli of a Continuous