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D.J. Lege
Researcher at Alcoa
Publications - 18
Citations - 3474
D.J. Lege is an academic researcher from Alcoa. The author has contributed to research in topics: Yield (engineering) & Formability. The author has an hindex of 10, co-authored 18 publications receiving 3138 citations. Previous affiliations of D.J. Lege include Seoul National University.
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Journal ArticleDOI
Plane stress yield function for aluminum alloy sheets—part 1: theory
Frédéric Barlat,Frédéric Barlat,J.C. Brem,Jeong W. Yoon,Jeong W. Yoon,Kwansoo Chung,Re Dick,D.J. Lege,Farhang Pourboghrat,Shi-Hoon Choi,E. Chu +10 more
TL;DR: In this article, a plane stress yield function that well describes the anisotropic behavior of sheet metals, in particular, aluminum alloy sheets, was proposed, which was introduced in the formulation using two linear transformations on the Cauchy stress tensor.
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A six-component yield function for anisotropic materials
TL;DR: In this paper, a new six-component yield surface description for orthotropic materials is developed, which has the advantage of being relatively simple mathematically and yet is consistent with yield surfaces computed with polycrystal plasticity models.
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Yield function development for aluminum alloy sheets
Frédéric Barlat,Maeda Yasushi,Kwansoo Chung,Masahiro Yanagawa,J.C. Brem,Hayashida Yasuhiro,D.J. Lege,Kuniaki Matsui,Shawn J. Murtha,Shigeo Hattori,R. Becker,S. Makosey +11 more
TL;DR: In this article, a generalized phenomenological yield description is proposed to account for the behavior of the solute strengthened aluminum alloy sheets studied in this work and the experimental yield surfaces were found to be in good agreement with the polycrystal predictions for all materials and with the phenomenological predictions for most materials.
Journal ArticleDOI
Yielding description for solution strengthened aluminum alloys
Frédéric Barlat,R. Becker,Hayashida Yasuhiro,Maeda Yasuhiro,Masahiro Yanagawa,Kwansoo Chung,J.C. Brem,D.J. Lege,Kuniaki Matsui,Shawn J. Murtha,Shigeo Hattori +10 more
TL;DR: In this paper, yield surfaces for binary aluminum-magnesium sheet samples were measured using biaxial compression tests on cubic specimens made from laminated sheet samples, and the yield surfaces were also predicted from a polycrystal model using crystallographic texture data as input and from a phenomenological yield function proposed previously.
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A simple model for dislocation behavior, strain and strain rate hardening evolution in deforming aluminum alloys
TL;DR: In this article, the average dislocation mean free paths at a strain of 0.5 were compared with TEM observations of dislocation cell sizes or inter-dislocation spacing for specimens deformed equal biaxially with the hydraulic bulge test.