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A fundamental part of calculations is the material model used in the formulation of the constitutive relation. In practice, the model is deduced from monodimensional tests, then generalized to the multiaxial field on the basis of well-established procedures in statics, but which are not sufficiently verified under impact conditions in dynamics. Dynamic tests in multiaxial stress conditions for this purpose are described. The first method employed uses cruciform specimens subject to deformation in tension. The second method uses a particular specimen which permits the creation, in a strain rate range of between 1.0 E-2 to 1.0 E+4 /s, of combined shear stress paths due to external tension and torsion loads. The interpretation of the results to define a material constitutive equation is not yet fully solved. In some situations, due to the fine structure of the material, a variable resistance field is required in the deformation path. The limits of several actual constitutive equations are discussed.

Additional information

Authors: ALBERTINI C, JRC Ispra Estab. (IT);MONTAGNANI M, JRC Ispra Estab. (IT);ELEICHE A M, Cairo Univ. (EG)
Bibliographic Reference: Paper presented: Second International Post-SMIRT Seminar, Anaheim, Ca. (US), Aug. 21-22, 1989
Availability: Available from (1) as Paper EN 34319 ORA
Record Number: 198910179 / Last updated on: 1994-12-01
Original language: en
Available languages: en