P4.5. Tensile stress-strain diagram of a [0/904]s AS-4 carbon fiber-epoxy lamina
ID: 2086019 • Letter: P
Question
P4.5. Tensile stress-strain diagram of a [0/904]s AS-4 carbon fiber-epoxy laminate is shown in the figure. The longitudinal modulus and trans verse modulus of a 0° unidirectional laminate of the same material are 142 and 10.3 GPa, respectively 1. Determine the initial axial modulus of the [0/90Js laminate and compare it with the theoretical value. How would this value change if the 90° layers are at the outside or the laminate construction is changed to [02/903ls? 2. The knee in the stress-strain diagram is at a strain of 0.005 mm/mm. However, the ultimate longitudinal and transverse strains of the 0 unidirectional laminate are at 0.0146 and 0.006 mm/mm, respect ively. Explain what might have caused a lower strain at the knee 3. Describe the reason for the nonlinear portion of the stress-strairn diagram 500 400 300 200 100 0 0 0.3 0.6 0.9 1.2 1.5 .8 Strain (percent)Explanation / Answer
1. Initial axial modulus is 270 gpa
2 cause of lower strain is presence of retained stress or dislocation which caused it to deform.
3. Presence of dislocation and anisotropic material caused it to be non linear.
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