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Jiann-Wen Woody Ju, Ph.D., P.E.      Professor 5731K Boelter Hall Department of Civil and Environmental Engineering University of California Los Angeles, CA 90095-1593 juj@ucla.edu Phone: (310) 206-1751      Fax: (310) 206-2222      Profile       Teaching       Research       Publications       Professional Affiliations and Service       Current Students    Areas of Research Interest  |  Supervision of Researchers and Students  Areas of Research Interest • Micromechanical damage mechanics for microcrack- or microvoid-weakened brittle or ductile solids. Interfacial micromechanics of multiphase composite materials. Microcrack interaction and evolution (nucleation, growth and kinking). Solids with many randomly dispersed microcracks or microvoids. Micro-macro correlation in mechanical properties of composite materials. Overall damaged moduli and microcrack kinetics (evolutionary models) based on advanced micromechanics, microstructures, and fracture mechanics. 2-D and 3-D effective medium micromechanical methods and statistical micromechanical interaction methods in tensile and compressive loadings. Many randomly distributed interfacial and intergranular microcracks and their effects on composite materials (including ceramics). Micromechanical experimental validation. Efficient computational algorithms for statistical micromechanical evolutionary damage modeling. Statistical microcrack array shielding and amplification effects on a macrocrack tip. Thermo-mechanical-chemical constitutive and damage modeling of airfield concrete pavement under high temperature; coupled heat transfer, mass transport and mechanical stress-strain fields of airfield concrete pavement for JSFs. • Continuum elastoplastic damage mechanics for brittle and ductile solids. Energy-based coupled elasto-(visco-)plastic (visco-)damage theories and computational algorithms. Thermodynamics basis. Physically motivated characterizations of brittle and ductile damage. Damage criteria and evolution equations. Elastic-damage and elastoplastic-damage tangent moduli. Rate-dependent damage mechanism. Microcrack opening and closing mechanisms. Isotropic and anisotropic damage models. Finite strain elastoplastic damage models. Efficient computational algorithms and operator splitting methods for evolutionary damage modeling within finite element methods. Extensive experimental validation. Structural damage indices and assessment. • Micromechanics of heterogeneous composites with many randomly distributed, strongly interacting inhomogeneities. Advanced particulate and fibrous brittle or metal matrix composites. Ceramics and ceramic composites. Probabilistic microstructures and microgeometry, including locations, sizes, densities, shapes, orientations, and relative configurations of many inclusions. Strong micromechanical interactions among many inclusions randomly dispersed in a matrix material based on Eshelby's eigenstrain concept. Overall ensemble-volume averaged moduli and material responses rigorously derived from interacting micromechanics and microstructures. Micromechanical experimental validation using SEM (scanning electron microscopy) and X-ray diffractometer. Mechanical (elastic and elasto-(visco-)plastic) and conductive properties of advanced particulate and fibrous composite materials. Elastic stress fields arising from the single fiber pullout problem. Extension to effective shear viscosities in colloidal suspensions at high shear rates. Efficient numerical algorithms for computational micromechanical modeling of composites. • Plasticity and viscoplasticity theories and computational algorithms. Non-smooth multi-surface plasticity and viscoplasticity. Stability, uniqueness, softening, and completeness issues. Efficient operator splitting and return mapping algorithms. Consistent tangent moduli for plasticity and viscoplasticity. Unified computational treatment for viscoplasticity and plasticity. • Nonlinear computational solid mechanics. Nonlinear elastoplastic and finite deformation frictional contact problems, including consistent tangent operators for superior asymptotic rate of convergence, and perturbed and augmented Lagrangian formulations. Advanced constitutive modeling and finite element computations for engineering materials and structures. Nonlinear equation solution strategies. Strain softening, material stability, well-posedness, and uniqueness problems. Large scale computations. Structural dynamics and transient analysis with finite element methods. • Nondestructive testing, destructive testing, and chemically induced damage models of concrete subjected to external aggressive species attack (e.g., sulfate attack). Damage/ deterioration of concrete foundations and construction defects. Modeling of the water/cement ratios, gel porosities and capillary porosities, permeability and damage (microcracking), reduction of elastic properties and tensile strength, damage mechanisms under combined chemical attack and mechanical loads, and service life predictions. Testing by using the low-frequency ultrasonic NDT, 4-point flexural bending tests, direct tension tests, splitting tension tests, and compression tests of the laboratory-cast concrete cylinders and of the concrete cores drilled from actual structures. In-situ impact-echo NDT of concrete structures. • Construction defects; Damage, fracture and failure of concrete (and stucco) components and structures; Durability; Reliability, Construction defect expert witness. • Fracture mechanics and failure analysis. Structural damage assessment due to earthquakes. • Computational geomechanics; Probabilistic and statistical mechanics of advanced composites.. • Nano-mechanics and nano-materials (such as carbon nanotubes, nano-composites). • Biomechanics of bones and muscles; computational biomechanics and micro-damage-healing; biomaterials. • Fiber reinforced concrete and cementitious composites.  Supervision of Researchers and Students • A. Post-Doctoral Research Fellows [1] Dr. Xiaogong Lee, 1989—1990. [2] Dr. Hang Deng, 1993—1995. [3] Dr. Kuang-Hui Tseng, 1994—1995. [4] Dr. Lun-Chang Chou, 1997—1998. [5] Dr. Yong Zhang, 1997–1998. [6] Dr. Lizhi Sun, 1998—1999. [7] Dr. Yong-Bock Rhee, 1998–1999. [8] Dr. Lisheng Weng, 2000—2001. [9] Dr. Yu-Fu (Paul) Ko, 2006. [10] Dr. Fariborz Tehrani, 2008-present. [11] Dr. Kuo-Yao (Matt) Yuan, 2009-present. • B. Visiting Professors and Researchers [1] Dr. Kuang-Hui Tseng, Jan. 1994 to Nov. 1994, Visiting Assistant Researcher. [2] Mr. Yaw-Dawn Pai, August 1998 to Feb. 1999, Visiting Researcher. [3] Professor Huaining Ruan, Oct. 1999 to July 2001, Visiting Researcher. [4] Professor Jun-Shang Kuang, July 2000 to Jan. 2001, Visiting Associate Professor. [5] Professor Geon-Ho Hong, July 2001 to August 2003, Visiting Researcher. [6] Professor Frank Yazdani, Sep. 2001 to August 2002, Visiting Associate Professor. [7] Professor Kangsuk Suh, July 2001 to July 2003, Visiting Researcher. [8] Professor Shiyong Jiang, July 2002 to Dec. 2002, Visiting Researcher. [9] Professor Menashi Cohen, Sep. 2002 to August 2003, Visiting Professor. [10] Professor Ping-Ju Lin, August 2003 to August 2004, Visiting Researcher. [11] Professor Jang-Ho Jay Kim, Sep. 2006 to August 2007, Visiting Associate Professor. [12] Mr. Zheng-Han Zhang, March to Oct. 2007, Visiting Researcher. [13] Professor Ching S. Chang, Sep. 2007 to Dec. 2007, Visiting Professor. [14] Dean and Professor Lufeng Yang, August 2007 to August 2008, Visiting Professor. [15] Ms. Biwan Xu, Sep. 2007 to March 2009, Visiting Researcher at UCLA. [16] Professor Volker Slowik, August 2008 to Dec. 2008, Visiting Professor. [17] Professor Wenhua Wu, October 2008 to October 2009, Visiting Researcher. [18] Dr. Genwei Wang, November 2008 to November 2009, Visiting Researcher. [19] Professor Liang-Jenq Leu, August to December 2009, Visiting Professor. [20] Professor Tai-Ping Chang, August 2009 to February 2010, Visiting Professor. [21] Professor Laurent Champaney, August 2009 to August 2010, Visiting Professor. [22] Ms. Gangqin Zhang, Oct. 2009 to Oct. 2011, Visiting Researcher at UCLA. [23] Ms. Ying Ma, Oct. 2009 to Oct. 2011, Visiting Researcher at UCLA. • C. Habilitation (D’Habilitation a Diriger des Recherches) Jury Member [1] GillesLubineau, Ph.D., Assistant Professor, Dec. 2008. ENS Cachan (Paris), France. • D. Doctoral Dissertations (Ph.D.) [1] Tsung-Muh Chen, Ph.D., 1993. Princeton University. [2] Kuang-Hui Tseng, Ph.D., 1994. Princeton University. Currently: Assistant Professor, Department of Civil and Environmental Engineering, Vanderbilt University. [3] Lun-Chang Chou, Ph.D., 1997. UCLA. Currently: Assistant Professor, Chien-Kuo Institute of Technology, Taiwan. [4] Yong Zhang, Ph.D., 1997. UCLA. [5] John Hah, Ph.D., 1997. UCLA. [6] Lizhi Sun, Ph.D., 1998. UCLA. Currently: Associate Professor and Vice Chair, Dept. of Civil and Environmental Engineering, University of California, Irvine. [7] Haeng-Ki Lee, Ph.D., 1998. UCLA. Currently: Associate Professor, Dept. of Civil Engineering, Korean Advance Institute of Science and Technology (KAIST). [8] Xiaodong Zhang, Ph.D., 1999. UCLA. Currently: General Motors Company. [9] Hongwei Gong, Ph.D., 2000. UCLA. Currently: Carter and Burgess Architects and Engineers. [10] Lisheng Weng, Ph.D., 2000. UCLA. Currently: Manager, Intel Corp. [11] Alberto Felix Salamanca Pinzon, Ph.D., 2004. UCLA. Currently: Assistant Researcher, UCLA. [12] Yu-Fu (Paul) Ko, Ph.D. 2005. UCLA. Currently: Senior Engineer, Englekirk and Sabol Structural Engineers. [13] Ms. Sejin Oh, Ph.D. 2007.UCLA. Currently: Research Scientist, Lawrence Livermore National Laboratories. [14] Prechaporn Suwatnodom, Ph.D. 2008. UCLA. Currently: Ministry of Transportation, Thailand. [15] Fariborz M. Tehrani, Ph.D. 2008. UCLA. Currently: Senior Engineer, Caltrans; Lecturer, UCLA. [16] Kuo-Yao (Matt) Yuan, Ph.D. 2008, UCLA. Currently: Post-Doc and Lecturer at UCLA. [17] Keiji Yanase, Ph.D. 2009, UCLA. Currently: Researcher at UCLA. [18] Ms. Biwan Xu, Ph.D. 2009, Tongji University (Shanghai, China). [19] Shih-Jie (Jay) Huang, Ph.D. Candidate, UCLA. [20] Yu-Kai (Carl) Wang, Ph.D. Candidate, UCLA. [21] Ms. Anny W. Kuo, Ph.D. student, UCLA. [22] Ms. Yi Wu, Ph.D. student, UCLA. [23] Ms. Hsuan-Ru Hung, Ph.D. student,UCLA. [24] Chung-Wen Chuang, Ph.D. student, UCLA. [25] Chia-So Chuang, Ph.D. student, UCLA. • E. Degree of Engineer [1] Fariborz Mohammadi Tehrani, 2003. [2] Shih-Jie (Jay) Huang, 2004. [3] Yu-Fu (Paul) Ko, 2004. [4] Ms. Sejin Oh, 2006. [5] Kuo-Yao (Matt) Yuan, 2007. • F. Master Theses/ M.S. Degrees [1] Tsung-Muh Chen, M.S., 1990. [2] Kuang-Hui Tseng, M.S., 1991. [3] Wen-Sen Lin, M.S., 1992. [4] Yong Zhang, M.S. (Plan II), 1996. [5] Lizhi Sun, M.S. (Plan II), 1997. [6] Xiaodong Zhang, M.S. (Plan II), 1997. [7] Haeng-Ki Lee, M.S. (Plan II), 1997. [8] Lisheng Weng, M.S. (Plan II), 1997. [9] Dalnim Kang, M.S. (Plan II), 1997. [10] Hongwei Gong, M.S. (Plan II), 1998. [11] Shuen-Ching Cheng, M.S. (Plan II), 1998. [12] Chang-Shien Lin, M.S. (Plan II), 1998. [13] Pin-Hsiu Yeh, M.S. (Plan II), 1998. [14] Hsiao-Chun Chao, M.S. (Plan II), 1998. [15] Tanya M. Reidy, M.S. (Plan II), 1998. [16] David Bates, M.S. (Plan II), 1998. [17] Mikael Azran, M.S. (Plan II), 1999. [18] Kregg Koch, M.S. (Plan II), 2000. [19] Khoi Do, M.S. (Plan II), 2000. [20] Alex J.C. Lee, M.S. (Plan II), 2000. [21] Sherwin Shoraka, M.S. (Plan II), 2000. [22] Naushad Hossain, M.S. Thesis, 2001. [23] Simon H.Y. Fu, M.S. Thesis, in progress. [24] Anny W. Kuo, M.S. (Plan II), 2001. [25] Shih-Jie (Jay) Huang, M.S. (Plan II), 2001. [26] Yu-Fu (Paul) Ko, M.S. (Plan II), 2001. [27] John Sun, M.S. (Plan II), 2001. [28] Prechaporn Suwatnodom, M.S. (Plan II), 2001. [29] Sejin Oh, M.S. (Plan II), 2003. [30] Alan E. Jalil, M.S. (Plan II), 2003. [31] Ali Monshizadeh, M.S. (Plan II), 2003. [32] Hsiao T. Hsiung, M.S. (Plan II), 2004. [33] Jorge Chen, M.S. (Plan II), 2004. [34] Richard James Henry Gash, M.S. (Plan II), 2005. [35] Hodong Han, M.S. (Plan II), 2005. [36] Daniel Wook Kwon, M.S. (Plan II), 2005. [37] Albert Yo-Jen Chen, M.S. (Plan II), 2006. [38] Chen-Min Huang, M.S. (Plan II), 2006. [39] Parham Hendifar, M.S. (Plan II), 2006. [40] Ashpica Chhabra, M.S. (Plan II), 2006. [41] Diane Amy-Marie Hurley, M.S. (Plan II), 2007. [42] Xiao Xuan Du, M.S. (Plan II), in progress. [43] Matthew John Fontanesi, M.S. (Plan II), 2007. [44] Adam Thomas Holman, M.S. (Plan II), 2007. [45] Albert Tam, M.S. (Plan II), 2008. [46] Kuo-Yao (Matt) Yuan, M.S. (Plan II), 2007. [47] Alessandro Paglia, M.S. Thesis (Plan I), 2009. [48] Pierre Alex Augustin, M.S. (Plan II), 2008. [49] Jan Yi Chen, M.S. (Plan II), 2008. [50] Kamalpreet Singh Kalsi, M.S. (Plan II), 2008. [51] Larry Quach, M.S. (Plan II), 2008. [52] Cameron Brooke Samuelson-Sanford, M.S. (Plan II), 2008. [53] Yi Wu, M.S. (Plan II), 2008. [54] Nergal Daniel, M.S. (Plan II), June 2009. [55] Michael Allen Guzzi, M.S. (Plan II), June 2009. [56] Michael Charles Hillman, M.S. (Plan II), June 2009. [57] Camille Marodon, M.S. (Plan II), June 2009. [58] Derrick Masulis, M.S. (Plan II), June 2009,. [59] Andrew Ahmad Ziaei, M.S. (Plan II), June 2009. Areas of Research Interest  |  Supervision of Researchers and Students

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