1 / 8

Design: isotropic vs. orthotropic lamina

Design: isotropic vs. orthotropic lamina. In-class exercise CTE problems Material replacement example. Coefficient of thermal expansion. This is an important design element, particularly for material replacement opportunities

ince
Download Presentation

Design: isotropic vs. orthotropic lamina

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Design: isotropic vs. orthotropic lamina

  2. In-class exerciseCTE problemsMaterial replacement example

  3. Coefficient of thermal expansion • This is an important design element, particularly for material replacement opportunities • The composite part is likely to have different expansion and contraction strains than the non-composite original • We expect differences in temperature to induce strains and stresses • We expect changes in stresses to lead to different dimensional changes in the part • These changes will affect the overall product design for the expected environmental conditions

  4. P3.29 • A unidirectional continuous fiber lamina contains carbon fibers in an epoxy matrix. The fiber volume fraction is 0.55. the coefficient of longitudinal thermal expansion for the lamina is measured as -0.61e-06 per C and that of the matrix is 54e-06 per C. Estimate the coefficient of thermal expansion for the fiber. The longitudinal modulus of the lamina is 163.3 GPa and the matrix modulus is 3.5 GPa. • plan your solution approach

  5. Problem P3.30 • Parameters • axial and transverse thermal expansion, vf = 0.60, 0 degree unidirectional Spectra 900 fiber-reinforced epoxy composites: • -9e-06; 100e-06 • n12 = 0.32; Em=2.8 Gpa; nm = 0.38; a=60e-06. • Estimate the Poisson’s ratio of the fiber • Estimate afl, afr • Find vf for which the CTE is zero • Plan your solution approach

  6. Example 3.5Material replacement problem • A thin plate is subjected to: sxx = 1 Gpa; syy=0.5GPa; • Compute the strains in the x and y directions if the plate is: • Steel • 0 degree boron-epoxy composite • 45 degree boron-epoxy composite • Plan your solution strategy

More Related