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A ply is laid at \( 45 \) degrees. For the laminate to be balanced there must also be a ply at

  • A.Plus 135 degrees
  • B.Minus 45 degrees
  • C.Plus 90 degrees
  • D.Zero degrees

Answer: B

Balance requires each off-axis ply to be paired with one at the opposite angle, which cancels the extension-shear coupling. Symmetry is a separate requirement concerning position through the thickness rather than angle.

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