docs: def force_orthotropic(self):
          r"""Force an orthotropic laminate
  
          The terms
          `A_{13}`, `A_{23}`, `A_{31}`, `A_{32}`,
          `B_{13}`, `B_{23}`, `B_{31}`, `B_{32}`,
          `D_{13}`, `D_{23}`, `D_{31}`, `D_{32}` are set to zero to force an
          orthotropic laminate.
  
          """
          if self.offset != 0.:
              raise RuntimeError(
                      'Laminates with offset cannot be forced orthotropic!')
          self.A[0, 2] = 0.
          self.A[1, 2] = 0.
          self.A[2, 0] = 0.
          self.A[2, 1] = 0.
  
          self.B[0, 2] = 0.
          self.B[1, 2] = 0.
          self.B[2, 0] = 0.
          self.B[2, 1] = 0.
  
          self.D[0, 2] = 0.
          self.D[1, 2] = 0.
          self.D[2, 0] = 0.
          self.D[2, 1] = 0.
  
          self.ABD[0, 2] = 0. # A16
          self.ABD[1, 2] = 0. # A26
          self.ABD[2, 0] = 0. # A61
          self.ABD[2, 1] = 0. # A62
  
          self.ABD[0, 5] = 0. # B16
          self.ABD[5, 0] = 0. # B61
          self.ABD[1, 5] = 0. # B26
          self.ABD[5, 1] = 0. # B62
  
          self.ABD[3, 2] = 0. # B16
          self.ABD[2, 3] = 0. # B61
          self.ABD[4, 2] = 0. # B26
          self.ABD[2, 4] = 0. # B62
  
          self.ABD[3, 5] = 0. # D16
          self.ABD[4, 5] = 0. # D26
          self.ABD[5, 3] = 0. # D61
          self.ABD[5, 4] = 0. # D62
  
          self.ABDE[0, 2] = 0. # A16
          self.ABDE[1, 2] = 0. # A26
          self.ABDE[2, 0] = 0. # A61
          self.ABDE[2, 1] = 0. # A62
  
          self.ABDE[0, 5] = 0. # B16
          self.ABDE[5, 0] = 0. # B61
          self.ABDE[1, 5] = 0. # B26
          self.ABDE[5, 1] = 0. # B62
  
          self.ABDE[3, 2] = 0. # B16
          self.ABDE[2, 3] = 0. # B61
          self.ABDE[4, 2] = 0. # B26
          self.ABDE[2, 4] = 0. # B62
  
          self.ABDE[3, 5] = 0. # D16
          self.ABDE[4, 5] = 0. # D26
          self.ABDE[5, 3] = 0. # D61
          self.ABDE[5, 4] = 0.