@article{oai:yamagata.repo.nii.ac.jp:00000918,
 author = {武田,  武信},
 journal = {山形大学紀要. 工学 = Bulletin of Yamagata University. Engineering},
 month = {Feb},
 note = {論文(Article), A subsequent yield function of the sixth degree has been proposed by the author. It is able to include three effects, namely the third deviatoric stress invariant , anisotropy and the Bauschinger effect. Experimental evaluation is made on A1050 aluminum tubes under multiaxial stress states. The tubing used has undergone progressive deformation such as extruding, plug drawing and stretching in the industrial forming process. For this reason, it has orthotropic anisotropy even after full annealing, and the initial yield locus in the tension-torsion stress field lies outside von Mises’ yield locus. Reloading tests by means of both combined axial load (tension and compression)-torsion and combined axial load-internal pressure-torsion are carried out on the fully annealed tubes subjected to prestrains in tension, torsion and combined tension-torsion. By determining the subsequent yield loci in various principal stress planes, the change in yield stress with a rotation of the principal stress axes is examined. Consequently, it is shown that anisotropic hardening (expansion, distortion and rotation of the locus) superposed kinematic hardening (translation) can be expressed precisely by the proposed yield function.\n\nKey words: A1050 aluminum , Tensile prestrain, Torsional prestrain, Combined prestrain, Yield locus , Subsequent yield function.},
 pages = {1--12},
 title = {種々の予ひずみを受けたアルミニウム管の多軸降伏挙動},
 volume = {34},
 year = {2013}
}