Assignment of chapter 5 Table 2.1 Typical Mechanical Properties of a Unidirectional Lamina (SI System of Units) Glass/ Boron/ Property Symbol Units epoxy epoxy Graphite/ epoxy Fiber volume fraction Vf 0.45 0.50 0.70 Longitudinal elastic modulus E GPa 38.6 204 181 Transverse elastic modulus E GPa 8.27 18.50 10.30 Major Poisson's ratio V12 0.26 0.23 0.28 Shear modulus G12 GPa 4.14 5.59 7.17 Ultimate longitudinal tensile strength (of)ult MPa 1062 1260 1500 Ultimate longitudinal compressive strength (o)ult MPa 610 2500 1500 Ultimate transverse tensile strength (0%)ult MPa 31 61 40 Ultimate transverse compressive strength (0%) ult MPa 118 202 246 Ultimate in-plane shear strength (512) ale MPa 72 67 68 Longitudinal coefficient of thermal expansion um/m/C 8.6 6.1 0.02 Transverse coefficient of thermal expansion m/m/C 22.1 30.3 22.5 Longitudinal coefficient of moisture expansion B m/m/kg/kg 0.00 0.00 0.00 Transverse coefficient of moisture expansion , m/m/kg/kg 0.60 0.60 0.60 (Source: Reprinted with permission from Tsai, S. W. and Hahn, H. T., Introduction to Composite Materials, Technomic Publishing Co., Inc., Lancaster, PA, Table 1.7, p. 19; Table 7.1, p. 292; Table 8.3, p. 344.) 5-1 Find the ply-by-ply failure loads for a [02/45/-45/904]s glass fiber/epoxy laminate. (1) The thickness of each ply is 0.12 mm. (2) Properties of unidirectional lamina are from Table 2.1. (3) The only applied load is a tensile normal load in the 0-fiber direction. (4) Maximum stress failure theory is used. ( 5 ) Using fully and partially discounted (f=0.2) stiffness methods for damaged plies, respectively. (only fully discounted is required in exam)