- Email: [email protected]
In honor of Kwansoo Chung
International Journal of Plasticity 58 (2014) 1–2
Contents lists available at ScienceDirect
International Journal of Plasticity journal homepage: www.elsevier.com/locate/ijplas
Editorial
In honor of Kwansoo Chung
This issue is dedicated to Professor Kwansoo Chung at Seoul National University, Korea. The papers were collected from contributions to the mini-symposium organized in his honor at the International Symposium on Plasticity and its Current Application, in Nassau, Bahamas, January 3–8, 2013. Born in Haenam located at a southern province of Korea in 1952, Kwansoo was raised and educated in Seoul through Korea’s most elite educational institutions, attending both Kyunggi middle and high schools. He received his BS and MS degrees in textile engineering at Seoul National University (SNU) in 1977 and 1979, respectively. In 1978, he married Meeyoung Lee, with whom he has two daughters, Youn and Jean. Meeyoung continues to not only be his spouse but his greatest supporter and lifetime friend. Following his studies at SNU, Kwansoo entered Stanford University in 1979 to study applied mechanics under the supervision of Professor Erastus H. Lee (who passed away in 2006), a prominent theoretician in plasticity and viscoelasticity. Along with his second MS degree in mechanical engineering in 1981, Kwansoo received his PhD at Stanford University on ‘‘The Analysis of Anisotropic Hardening in Finite- Deformation Plasticity’’ in 1984, which came to serve as the backbone for his life-long research on mechanics of materials (the popular stress update scheme now often known as the cutting plane algorithm was introduced here for the isotropic-kinematic hardening formulation). After a brief Post-Doctoral fellowship at Rensselaer Polytechnic Institute in NY, Kwansoo continued his Post-Doctoral and Research Associate fellowships with Professor Robert H. Wagoner at the Ohio State University from 1984 to 1987, working on the rigid-plastic formulation for sheet forming and the invariance principle for strain rate sensitive materials [1]. In 1987, after moving to the Alcoa Technical Center in PA, Kwansoo started his collaboration with Dr. Owen Richmond (who passed away in 1999), a fatherly figure who became a close personal friend and mentor. The deformation theory based on the minimum plastic work [2] developed at ATC became the elegant theoretical foundation of the process design formulation for bulk and sheet forming with minimum plastic work (the Ideal Forming Theory [3]) as well as the analysis-purpose finite element formulation in both elasto-plasticity and rigid-plasticity. Most of the one-step inverse design commercial codes for sheet forming are based on the Ideal Forming Theory. In parallel, Kwansoo contributed to the establishment of anisohttp://dx.doi.org/10.1016/j.ijplas.2014.04.004 0749-6419/Ó 2014 Elsevier Ltd. All rights reserved.
2
Editorial / International Journal of Plasticity 58 (2014) 1–2
tropic yield function and strain rate potential concepts at ATC and in the plasticity community. In particular, he developed consistent formulations for their numerical implementations in the user-subroutines of commercial finite element codes [4], which became a major driver of the widespread utilization of the subroutines for user-defined material models. In addition to his scientific endeavor, Kwansoo also made managerial contributions to the joint project with Kobe Steel Ltd. in Japan on Formability of Aluminum Sheet Alloys. During his nine and half years at ATC, he was also a distinguished mid-fielder for Alcoa’s internal soccer team, the Alcoa Beer Cans. After starting his new career as an Associate Professor in the Department of Materials Science and Engineering at SNU in 1996, Kwansoo received his tenure and professor position in 2001. He mainly taught fundamental courses in mechanics of materials, covering engineering mathematics, solid mechanics, plasticity and viscoelasticity. By leading his Materials Mechanics Lab (address: [email protected]), Kwansoo continued contributing to constitutive modeling such as nonlinear kinematic hardening formulations for anisotropic sheet metals [5,6]. To this day, he continues to make excellent contributions to the fields of constitutive modeling, formability, fracture [7] as well as viscoelasticity [8], textile composites [8] and precision glasses. Kwansoo has been a devoted educator and mentor for many junior researchers and students supervising with personal attachment and passion, which resulted in their high quality theses and achievements. He has served as the principal advisor for 13 PhD and 15 MS students at SNU so far. He has also been serving as a POSCO research professor for Ferrous Materials since 2006. He chaired the NUMISHEET2011 Conference held in Seoul, Korea. Throughout his entire career, his publications have been cited over 3000 times (The maximum number of citation among Web of Knowledge and Scopus, as of April 1, 2014). 1. K. Chung and R.H. Wagoner, ‘‘Invariance of Necking Formation to Material Strength and Strain Rate for Power-Law Materials,’’ Metallurgical Transactions, 17A, pp.1632–1633, 1986. 2. K. Chung and O. Richmond, ‘‘A Deformation Theory of Plasticity Based on Minimum Work Paths,’’ International Journal of Plasticity, Vol. 9, pp. 907–920, 1993. 3. K. Chung and O. Richmond, ‘‘Mechanics of Ideal Forming,’’ Journal of Applied Mechanics, ASME, Vol. 61, pp. 176–181, 1994. 4. K. Chung and K. Shah, ‘‘Finite Element Simulation of Sheet Metal Forming for Planar Anisotropic Metals,’’ International Journal of Plasticity, Vol. 8, pp. 453–476, 1992. 5. K. Chung, M.G. Lee, D. Kim, C. Kim, M. L. Wenner, F. Barlat, ‘‘Spring-back Evaluation of Automotive Sheets Based on IsotropicKinematic Hardening Laws and Non-Quadratic Anisotropic Yield Functions, Part I: Theory and Formulation,’’ International Journal of Plasticity, Vol. 21, pp. 861–882, 2005/5. 6. K. Chung and T. Park, ‘‘Consistency Condition of Isotropic-Kinematic Hardening of Anisotropic Yield Functions with Full Isotropic hardening under Monotonously Proportional Loading,’’ International Journal of Plasticity, Vol. 45, pp. 61–84, 2013/6. 7. K. Chung, N. Ma, T. Park, D. Kim, D. Yoo, C. Kim, ‘‘A Modified Damage Model for Advanced High Strength Steel Sheets,’’ International Journal of Plasticity, Vol. 27, pp. 1485–1511, 2011/10. 8. K. Chung and H. Ryou, ‘‘Development of Viscoelastic/Rate-sensitive-plastic Constitutive Law for Fiber-reinforced Composites and its Applications Part I: Theory and Material Characterization,’’ Composites Science & Technology, Vol. 69, pp. 284–291, 2009/2. The guest-editors and all contributing authors are so pleased to dedicate this special issue to Kwansoo, in recognition for his exceptional contributions to the field of materials mechanics as well as for the international plasticity research community through the International Journal of Plasticity (over 35 papers) and International Symposium on Plasticity and Its Current Applications (attending 1997–2013). This issue contains 10 papers in the area of mechanics and materials. The guesteditors are also grateful to Professor Akhtar Khan for providing the opportunity to honor his career achievements. Jeong Whan Yoon Deakin University, Geelong, Australia Frederic Barlat Pohang University of Science and Technology, Pohang, Korea
Contents lists available at ScienceDirect
International Journal of Plasticity journal homepage: www.elsevier.com/locate/ijplas
Editorial
In honor of Kwansoo Chung
This issue is dedicated to Professor Kwansoo Chung at Seoul National University, Korea. The papers were collected from contributions to the mini-symposium organized in his honor at the International Symposium on Plasticity and its Current Application, in Nassau, Bahamas, January 3–8, 2013. Born in Haenam located at a southern province of Korea in 1952, Kwansoo was raised and educated in Seoul through Korea’s most elite educational institutions, attending both Kyunggi middle and high schools. He received his BS and MS degrees in textile engineering at Seoul National University (SNU) in 1977 and 1979, respectively. In 1978, he married Meeyoung Lee, with whom he has two daughters, Youn and Jean. Meeyoung continues to not only be his spouse but his greatest supporter and lifetime friend. Following his studies at SNU, Kwansoo entered Stanford University in 1979 to study applied mechanics under the supervision of Professor Erastus H. Lee (who passed away in 2006), a prominent theoretician in plasticity and viscoelasticity. Along with his second MS degree in mechanical engineering in 1981, Kwansoo received his PhD at Stanford University on ‘‘The Analysis of Anisotropic Hardening in Finite- Deformation Plasticity’’ in 1984, which came to serve as the backbone for his life-long research on mechanics of materials (the popular stress update scheme now often known as the cutting plane algorithm was introduced here for the isotropic-kinematic hardening formulation). After a brief Post-Doctoral fellowship at Rensselaer Polytechnic Institute in NY, Kwansoo continued his Post-Doctoral and Research Associate fellowships with Professor Robert H. Wagoner at the Ohio State University from 1984 to 1987, working on the rigid-plastic formulation for sheet forming and the invariance principle for strain rate sensitive materials [1]. In 1987, after moving to the Alcoa Technical Center in PA, Kwansoo started his collaboration with Dr. Owen Richmond (who passed away in 1999), a fatherly figure who became a close personal friend and mentor. The deformation theory based on the minimum plastic work [2] developed at ATC became the elegant theoretical foundation of the process design formulation for bulk and sheet forming with minimum plastic work (the Ideal Forming Theory [3]) as well as the analysis-purpose finite element formulation in both elasto-plasticity and rigid-plasticity. Most of the one-step inverse design commercial codes for sheet forming are based on the Ideal Forming Theory. In parallel, Kwansoo contributed to the establishment of anisohttp://dx.doi.org/10.1016/j.ijplas.2014.04.004 0749-6419/Ó 2014 Elsevier Ltd. All rights reserved.
2
Editorial / International Journal of Plasticity 58 (2014) 1–2
tropic yield function and strain rate potential concepts at ATC and in the plasticity community. In particular, he developed consistent formulations for their numerical implementations in the user-subroutines of commercial finite element codes [4], which became a major driver of the widespread utilization of the subroutines for user-defined material models. In addition to his scientific endeavor, Kwansoo also made managerial contributions to the joint project with Kobe Steel Ltd. in Japan on Formability of Aluminum Sheet Alloys. During his nine and half years at ATC, he was also a distinguished mid-fielder for Alcoa’s internal soccer team, the Alcoa Beer Cans. After starting his new career as an Associate Professor in the Department of Materials Science and Engineering at SNU in 1996, Kwansoo received his tenure and professor position in 2001. He mainly taught fundamental courses in mechanics of materials, covering engineering mathematics, solid mechanics, plasticity and viscoelasticity. By leading his Materials Mechanics Lab (address: [email protected]), Kwansoo continued contributing to constitutive modeling such as nonlinear kinematic hardening formulations for anisotropic sheet metals [5,6]. To this day, he continues to make excellent contributions to the fields of constitutive modeling, formability, fracture [7] as well as viscoelasticity [8], textile composites [8] and precision glasses. Kwansoo has been a devoted educator and mentor for many junior researchers and students supervising with personal attachment and passion, which resulted in their high quality theses and achievements. He has served as the principal advisor for 13 PhD and 15 MS students at SNU so far. He has also been serving as a POSCO research professor for Ferrous Materials since 2006. He chaired the NUMISHEET2011 Conference held in Seoul, Korea. Throughout his entire career, his publications have been cited over 3000 times (The maximum number of citation among Web of Knowledge and Scopus, as of April 1, 2014). 1. K. Chung and R.H. Wagoner, ‘‘Invariance of Necking Formation to Material Strength and Strain Rate for Power-Law Materials,’’ Metallurgical Transactions, 17A, pp.1632–1633, 1986. 2. K. Chung and O. Richmond, ‘‘A Deformation Theory of Plasticity Based on Minimum Work Paths,’’ International Journal of Plasticity, Vol. 9, pp. 907–920, 1993. 3. K. Chung and O. Richmond, ‘‘Mechanics of Ideal Forming,’’ Journal of Applied Mechanics, ASME, Vol. 61, pp. 176–181, 1994. 4. K. Chung and K. Shah, ‘‘Finite Element Simulation of Sheet Metal Forming for Planar Anisotropic Metals,’’ International Journal of Plasticity, Vol. 8, pp. 453–476, 1992. 5. K. Chung, M.G. Lee, D. Kim, C. Kim, M. L. Wenner, F. Barlat, ‘‘Spring-back Evaluation of Automotive Sheets Based on IsotropicKinematic Hardening Laws and Non-Quadratic Anisotropic Yield Functions, Part I: Theory and Formulation,’’ International Journal of Plasticity, Vol. 21, pp. 861–882, 2005/5. 6. K. Chung and T. Park, ‘‘Consistency Condition of Isotropic-Kinematic Hardening of Anisotropic Yield Functions with Full Isotropic hardening under Monotonously Proportional Loading,’’ International Journal of Plasticity, Vol. 45, pp. 61–84, 2013/6. 7. K. Chung, N. Ma, T. Park, D. Kim, D. Yoo, C. Kim, ‘‘A Modified Damage Model for Advanced High Strength Steel Sheets,’’ International Journal of Plasticity, Vol. 27, pp. 1485–1511, 2011/10. 8. K. Chung and H. Ryou, ‘‘Development of Viscoelastic/Rate-sensitive-plastic Constitutive Law for Fiber-reinforced Composites and its Applications Part I: Theory and Material Characterization,’’ Composites Science & Technology, Vol. 69, pp. 284–291, 2009/2. The guest-editors and all contributing authors are so pleased to dedicate this special issue to Kwansoo, in recognition for his exceptional contributions to the field of materials mechanics as well as for the international plasticity research community through the International Journal of Plasticity (over 35 papers) and International Symposium on Plasticity and Its Current Applications (attending 1997–2013). This issue contains 10 papers in the area of mechanics and materials. The guesteditors are also grateful to Professor Akhtar Khan for providing the opportunity to honor his career achievements. Jeong Whan Yoon Deakin University, Geelong, Australia Frederic Barlat Pohang University of Science and Technology, Pohang, Korea