Abstract
A combined theoretical and experimental investigation was conducted to assess the suitability of the 10-deg off-axis tensile-test specimen for the intralaminar-shear characterization of unidirectional composites. Composite mechanics, a combined-stress failure criterion and a finiteelement analysis were used to determine theoretically the stress-strain variation across the specimen width and the relative stress and strain magnitudes at the 10-deg plane. Strain gages were used to measure the strain variation across the specimen width at specimen midlength and near the end tabs. Specimens from Mod-I/epoxy. T-300/epoxy, and S-glass/epoxy were used in the experimental program. It was found that the 10-deg off-axis tensile-test specimen is suitable for intralaminar-shear characterization and it, is recommended that it should be considered as a possible standard test specimen for such a characterization.
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Abbreviations
- E :
-
normal modulus; subscripts define direction
- F :
-
combined-stress failure-criterion function
- G :
-
shear modulus—intralaminar
- K :
-
coupling coefficient in combined-stress failure-criterion function
- S :
-
uniaxial fracture stress; subscripts define direction
- x, y, z :
-
structural-axes orthogonal coordinate system withx taken along load direction
- 1, 2, 3:
-
material-axes orthogonal coordinate system with 1 taken along fiber direction
- ε:
-
strain; subscripts define type, plane and direction
- θ:
-
orientation angle between structural and material axes measured positive counterclockwise
- θ g :
-
orientation angle locating strain gage from load direction
- σ:
-
stress; subscripts define type, plane and direction
- C :
-
compression
- c :
-
structural-axes property
- g :
-
strain-gage reading
- ℓ:
-
ply (unidirectional composite) property
- S :
-
shear, symmetric
- T :
-
tension
- x, y, z :
-
structural-axes directions
- 1, 2, 3:
-
material-axes directions
References
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Daniel, I.M. and Liber, T., “Lamination Residual Stresses in Fiber Composites,” ITT Res. Inst. Rep. IITRI-D6073-1 (1975); also NASA CR-134826.
Chamis, C.C., “Failure Criteria for Filamentary Composites,” NASA TN D-5367 (1969).
Chami, C.C., “Failure Criteria for Filamentary Composites”STP 460. Composite Materials: Testing and Design, ASTM, New Orleans, 336–351 (1972).
“Transverse Sensitivity Errors,” Micro-Measurements, Tech. Note 137.
Chamis, C.C., Kring, J.F. and Sullivan, T.L., “Automated Testing Data Reduction Computer Program,” NASA TM X-68050 (1972).
Chamis, C.C. and Sullivan, T.L., “Combined-Load Stress-Strain Relationships of Fiber Composite Laminates,” NASA TM X-71825 (1976).
Daniel, I.M. and Liber, T., “Strain Rate Effects on Mechanical Properties of Fiber Composites,” IIT Res. Inst. Rep. IITRI-D6073-IV (1976); also NASA CR-135087.
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Chamis, C.C., Sinclair, J.H. Ten-deg off-axis test for shear properties in fiber composites. Experimental Mechanics 17, 339–346 (1977). https://doi.org/10.1007/BF02326320
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DOI: https://doi.org/10.1007/BF02326320