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@TECHREPORT{Heyer:136333,
      author       = {Heyer, D.},
      title        = {{B}estimmung der elastischen {K}onstanten von
                      {P}olyäthylen},
      volume       = {1723},
      number       = {Juel-1723},
      address      = {Jülich},
      publisher    = {Kernforschungsanlage Jülich, Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136333, Juel-1723},
      series       = {Berichte der Kernforschungsanlage Jülich},
      year         = {1981},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {This work reports the first direct determination of the
                      microscopic elastic shear constants C$_{44}$ , C$_{55}$,
                      C$_{66}$ and C' = $\frac{1}{4}$(C$_{11}$+C$_{22}$-2C$_{12}$
                      ) of crystalline polyethylene at room temperature. Fully
                      deuterated and uniaxially oriented polycrystalline sampIes
                      were used. The constants were obtained from a comparison of
                      inelastic neutron scattering intensity profiles at low
                      energy transfer near Bragg reflections with calculations in
                      the long wavelength limit. The results are C44 = 2.1 $\pm$
                      0.3 GPa, C$_{55}$ = 2.2 $\pm$ 0.3 GPa, C$_{66}$ = 1.46 $\pm$
                      0.25 GPa and C' = 0.87 $\pm$ 0.25 GPa. Earlier macroscopic
                      data can be derived satisfactorily from the measured
                      constants assuming homogeneous stress in the sample.},
      cin          = {IFF},
      ddc          = {500},
      cid          = {I:(DE-Juel1)VDB241},
      typ          = {PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/136333},
}