Professor
Department of Mechanical Engineering
Contact
Phone:  2147681378 
Email:  xlgao@smu.edu 
Professional website:  http://people.smu.edu/xlgao/ 
Educational Background
MSc, Engineering Mechanics, University of WisconsinMadison, May 1997; PhD, Mechanical Engineering, University of WisconsinMadison, May 1998
About

Solid Mechanics and Mechanics of Materials

Solid and structural mechanics, higherorder continuum theories

Multiscale materials modeling and micro and nanomechanics

Traumatic brain injury, biomechanics, mechanics of soft materials

3D printed materials, nanocomposites, cellular and porous materials, textile and ballistic materials
Books and special issues
 Li, S. and Gao, X.L. (2013). Handbook of Micro and Nanomechanics. Pan Stanford Publishing Co., April 2013. (1206 pages)
 Gao, X.L. and Li, S. (2012). Special Issue on Mechanics of Heterogeneous Solids and Composite Materials, ASME Journal of Engineering Materials and Technology, Vol. 134, No. 3, July 2012.
 Gao, X.L. and Zhang, J. (2009). Special Issue on Nonlinear Behaviors of Materials, journal of Mechanics of Advanced Materials and Structures, Vol. 16, No. 7, October 2009.
 Gao, X.L. (2008). Special Issue on Micro and Nanomechanics, journal of Mechanics of Advanced Materials and Structures, Vol. 15, No. 8, December 2008.
 Sharma, P. and Gao, X.L. (2008). Special Issue on Scale Effects in Mechanics, journal of Mathematics and Mechanics of Solids, Vol. 13, No. 34, May 2008.
Journal papers
 101. Gao, X.L. and Zhang, G. Y. (2014). A microstructure and surface energydependent thirdorder shear deformation beam model. Z. angew. Math. Phys. (in press) (DOI: 10.1007/s0003301404550)
 100. Gao, X.L. (2014). A new Timoshenko beam model incorporating microstructure and surface energy effects. Acta Mech. (published online on 15 July 2014) (DOI: 10.1007/s007070141189y)
 99. Kulkarni, S., Gao, X.L., Horner, S. E. and Mortlock, R. F. and Zheng, J. Q. (2014). A transversely isotropic viscohyperelastic constitutive model for soft tissues. Math. Mech. Solids (published online on 13 June 2014) (DOI: 10.1177/1081286514536921)
 98. Zhou, S. S. and Gao, X.L. (2014). Solutions of the generalized halfplane and halfspace Cerruti problems with surface effects. Z. angew. Math. Phys.(published online on 16 April 2014) (DOI: 10.1007/s0003301404194)
 97. Zhou, S. S. and Gao, X.L. (2014). A nonclassical model for circular Mindlin plates based on a modified couple stress theory. ASME J. Appl. Mech. 81, 0510141~8.
 96. Shaat, M., Mahmoud, F. F., Gao, X.L. and Faheem, A. F. (2014). Sizedependent bending analysis of Kirchhoff nanoplates based on a modified couplestress theory including surface effects. Int. J. Mech. Sci. 79, 3137.
 95. Ma, H. M. and Gao, X.L. (2014). A new homogenization method based on a simplified strain gradient elasticity theory. Acta Mech. 225, 1075–1091.
 94. Gao, X.L. and Mao, C. L. (2014). Solution of the contact problem of a rigid conical frustum indenting a transversely isotropic elastic halfspace. ASME J. Appl. Mech. 81, 0410071~12.
 93. Su, Y.Y. and Gao, X.L. (2014). Analytical model for adhesively bonded composite panelflange joints based on the Timoshenko beam theory. Compos. Struct. 107, 112118.
 92. Wen, J.F., Tu, S.T., Gao, X.L. and Reddy, J. N. (2014). New model for creep damage analysis and its application to creep crack growth simulations. Mater. Sci. Tech. 30, 3237.
 91. Kulkarni, S. and Gao, X.L. (2014). A predictive study of effective properties and progressive failure of triaxially woven SiCfSiC composites. Int. J. Automotive Compos. 1, 3951.
 90. Liu, M. Q. and Gao, X.L. (2014). Solution of the Eshelbytype antiplane strain polygonal inclusion problem based on a simplified strain gradient elasticity theory. Acta Mech. 225, 809–823.
 89. Gao, X.L. and Mahmoud, F. F. (2014). A new BernoulliEuler beam model incorporating microstructure and surface energy effects. Z. angew. Math. Phys. 65, 393–404.
 88. Ma, H. M. and Gao, X.L. (2013). Strain gradient solution for a finitedomain Eshelbytype antiplane strain inclusion problem. Int. J. Solids Struct. 50, 37933804.
 87. Gao, X.L., Huang, J. X. and Reddy, J. N. (2013). A nonclassical thirdorder shear deformation plate model based on a modified couple stress theory. Acta Mech. 224, 2699–2718.
 86. Kulkarni, S., Gao, X.L., Horner, S. E. , Zheng, J. Q. and David, N. V. (2013). Review: Ballistic helmets  their design, materials, and performance against traumatic brain injury. Compos. Struct. 101, 313331.
 85. Wen, J.F., Tu, S.T., Gao, X.L. and Reddy, J. N. (2013). Simulations of creep crack growth in 316 stainless steel using a new creepdamage model. Eng. Fract. Mech. 98, 169184.
 84. Gao, X.L. and Zhou, S. S. (2013). Strain gradient solutions of halfspace and halfplane contact problems. Z. angew. Math. Phys. 64, 13631386.
 83. Liu, M. Q. and Gao, X.L. (2013). Strain gradient solution for the Eshelbytype polygonal inclusion problem. Int. J. Solids Struct. 50, 328338.
 82. Zhou, S. S. and Gao, X.L. (2013). Solutions of halfspace and halfplane contact problems based on surface elasticity. Z. angew. Math. Phys. 64, 145166.
 81. David, N. V., Gao, X.L. and Zheng, J. Q. (2013). Creep of a Twaron®/natural rubber composite. Mech. Adv. Mater. Struct. 20, 464477.
 80. Su, Y.Y. and Gao, X.L. (2013). An analytical study on peeling of an adhesively bonded joint based on the Timoshenko beam theory. Mech. Adv. Mater. Struct. 20, 454463.
 79. Gao, X.L. and Ma, H. M. (2012). Strain gradient solution for the Eshelbytype antiplane strain inclusion problem. Acta Mech. 223, 10671080.
 78. Zhou, S. S., Gao, X.L. and Griffith, G. W. (2012). Analysis and structural optimization of a threelayer composite cladding tube under thermomechanical loads. ASME J. Eng. Mater. Tech. 134, 0310011~12.
 77. Gogineni, S., Gao, X.L., David, N. V. and Zheng, J. Q. (2012). Ballistic impact of Twaron CT709® plain weave fabrics. Mech. Adv. Mater. Struct. 19, 441452.
 76. Gao, X.L. and Liu, M. Q. (2012). Strain gradient solution for the Eshelbytype polyhedral inclusion problem. J. Mech. Phys. Solids 60, 261276.
 75. Wang, X. and Gao, X.L. (2011). On the uniform stress state inside an inclusion of arbitrary shape in a threephase composite. Z. angew. Math. Phys. 62, 11011116.
 74. Ma, H. M., Gao, X.L. and Reddy, J. N. (2011). A nonclassical Mindlin plate model based on a modified couple stress theory. Acta Mech. 220, 217235.
 73. Zhou, S. S., Gao, X.L. and He, Q.C. (2011). A unified treatment of axisymmetric adhesive contact problems using the harmonic potential function method. J. Mech. Phys. Solids 59, 145159.
 72. Ma, H. M. and Gao, X.L. (2011). Strain gradient solution for the finitedomain Eshelbytype plane strain inclusion problem and Eshelby’s tensor for a cylindrical inclusion in a finite elastic matrix. Int. J. Solids Struct. 48, 4455.
 71. David, N. V., Gao, X.L. and Zheng, J. Q. (2011). Stress relaxation of a Twaron®/ natural rubber composite. ASME J. Eng. Mater. Technol. 133, 0110011~9.
 70. Sun, L.H., Ounaies, Z., Gao, X.L., Whalen, C. A. and Yang, Z.G. (2011). Preparation, characterization and modeling of carbon nanofiber reinforced epoxy nanocomposites. J. Nanomaterials 2011, 3075891~8.
 69. Gao, X.L. and Ma, H. M. (2010). Strain gradient solution for Eshelby’s ellipsoidal inclusion problem. Proc. Royal Soc. A 466, 24252446.
 68. Gao, X.L. and Ma, H. M. (2010). Solution of Eshelby’s inclusion problem with a bounded domain and Eshelby’s tensor for a spherical inclusion in a finite spherical matrix based on a simplified strain gradient elasticity theory. J. Mech. Phys. Solids 58, 779797.
 67. Ma, H. M., Gao, X.L. and Benson Tolle, T. (2010). Monte Carlo modeling of the fiber curliness effect on percolation of conductive composites. Appl. Phys. Lett. 96, 0619101~3.
 66. David, N. V., Gao, X.L. and Zheng, J. Q. (2010). Constitutive behavior of a Twaron®/natural rubber composite. Mech. Adv. Mater. Struct. 17, 246259.
 65. Ma, H. M. and Gao, X.L. (2010). Eshelby’s tensors for plane strain and cylindrical inclusions based on a simplified strain gradient elasticity theory. Acta Mech. 211, 115129
 64. Ma, H. M., Gao, X.L. and Reddy, J. N. (2010). A nonclassical ReddyLevinson beam model based on a modified couple stress theory. Int. J. Multiscale Comput. Eng. 8, 167180.
 63. David, N. V., Gao, X.L. and Zheng, J. Q. (2009). Ballistic resistant body armor: contemporary and prospective materials and related protection mechanisms. Appl. Mech. Rev. 62, 0508021~20.
 62. David, N. V., Gao, X.L. and Zheng, J. Q. (2009). Modeling of viscoelastic behavior of ballistic fabrics at low and high strain rates. Int. J. Multiscale Comput. Eng. 7, 295308.
 61. Gao, X.L. and Ma, H. M. (2009). Green’s function and Eshelby’s tensor based on a simplified strain gradient elasticity theory. Acta Mech. 207, 163181.
 60. Li, K., Gao, X.L., Fielding, J. C. and Benson Tolle, T. (2009). Modeling of electrical conductivity of nickel nanostrand filled polymer matrix composites. J. Comput. Theoretical Nanoscience 6, 494504.
 59. Gao, X.L., Park, S. K. and Ma, H. M. (2009). Analytical solution for a pressurized thickwalled spherical shell based on a simplified strain gradient elasticity theory. Math. Mech. Solids 14, 747758.
 58. Gu, H., Gao, X.L. and Li, X. (2009). Molecular dynamics study on mechanical properties and interfacial morphology of aluminum matrix nanocomposites reinforced by Betasilicon carbide nanoparticles. J. Comput. Theoretical Nanoscience 6, 6172.
 57. Ma, H. M., Gao, X.L. and Reddy, J. N. (2008). A microstructuredependent Timoshenko beam model based on a modified couple stress theory. J. Mech. Phys. Solids 56, 33793391. (The most cited article published in Elsevier’s Journal of the Mechanics and Physics of Solids since 2008 as of 12/31/2013)
 56. Park, S. K. and Gao, X.L. (2008). Micromechanical modeling of honeycomb structures based on a modified couple stress theory. Mech. Adv. Mater. Struct. 15, 574593.
 55. Park, S. K. and Gao, X.L. (2008). Variational formulation of a modified couple stress theory and its application to a simple shear problem. Z. angew. Math. Phys. 59, 904917.
 54. Ma, H. M. and Gao, X.L. (2008). A threedimensional Monte Carlo model for electrically conductive polymer matrix composites filled with curved fibers. Polymer 49, 42304238.
 53. Gao, X.L. (2008). Analytical solution for the stress field around a hard spherical particle in a metal matrix composite incorporating size and finite volume effects. Math. Mech. Solids 13, 357372.
 52. Gao, X.L. and Park, S. K. (2007). Variational formulation of a simplified strain gradient elasticity theory and its application to a pressurized thickwalled cylinder problem. Int. J. Solids Struct. 44, 74867499.
 51. Ghosh, D., Subhash, G., Sudarshan, T. S., Radhakrishnan, R. and Gao, X.L. (2007). Dynamic indentation response of finegrained boron carbide. J. Am. Ceram. Soc. 90, 18501857.
 50. Li, K., Gao, X.L. and Wang, J. (2007). Dynamic crushing behavior of honeycomb structures with irregular cell shapes and nonuniform cell wall thickness. Int. J. Solids Struct. 44, 50035026.
 49. Gao, X.L. (2007). Strain gradient plasticity solution for an internally pressurized thickwalled cylinder of an elastic linearhardening material. Z. angew. Math. Phys. 58, 161173.
 48. Park, S. K. and Gao, X.L. (2006). BernoulliEuler beam model based on a modified couple stress theory. J. Micromech. Microeng. 16, 23552359.
 47. Gao, X.L. (2006). An expanding cavity model incorporating strainhardening and indentation size effects. Int. J. Solids Struct. 43, 66156629.
 46. Li, K., Gao, X.L. and Roy, A.K. (2006). Micromechanical modeling of viscoelastic properties of carbon nanotubereinforced polymer composites. Mech. Adv. Mater. Struct. 13, 317328.
 45. Gao, X.L. (2006). A new expanding cavity model for indentation hardness including strainhardening and indentation size effects. J. Mater. Research 21, 13171326.
 44. Gao, X.L., Jing, X.N. and Subhash, G. (2006). Two new expanding cavity models for indentation deformations of elastic strainhardening materials. Int. J. Solids Struct. 43, 21932208.
 43. Li, K., Gao, X.L. and Subhash, G. (2006). Effects of cell shape and strut crosssectional area variations on the elastic properties of threedimensional opencell foams. J. Mech. Phys. Solids 54, 783806.
 42. Gao, X.L. (2006). Strain gradient plasticity solution for an internally pressurized thickwalled spherical shell of an elastic linearhardening material. Mech. Adv. Mater. Struct. 13, 4349.
 41. Subhash, G., Liu, Q. and Gao, X.L. (2006). Quasistatic and high strainrate uniaxial compressive response of polymeric structural foams. Int. J. Impact Engr. 32, 11131126.
 40. Jing, X.N., Zhao, J.H., Subhash, G. and Gao, X.L. (2005). Anisotropic grain growth with pore drag under applied loads. Mater. Sci. Eng. A 412, 271278.
 39. Liu, Q., Subhash, G. and Gao, X.L. (2005). A parametric study on crushability of opencell structural polymeric foams. J. Porous Mater. 12, 233248.
 38. Li, K., Gao, X.L. and Roy, A.K. (2005). Micromechanical modeling of threedimensional opencell foams using the matrix method for spatial frames. Composites: Part B 36, 249262.
 37. Li, K., Gao, X.L. and Subhash, G. (2005). Effects of cell shape and cell wall thickness variations on the elastic properties of twodimensional cellular solids. Int. J. Solids Struct. 42, 17771795. (One of the 50 most cited articles published in IJSS between 2004 and 2008 as of 10/25/2009)
 36. Gao, X.L. and Li, K. (2005). A shearlag model for carbon nanotubereinforced polymer composites. Int. J. Solids Struct. 42, 16491667. (One of the 50 most cited articles published in IJSS between 2004 and 2008 as of 10/25/2009)(No. 15 of the SciVerse ScienceDirect Top 25 for 20092010 Academic Year – IJSS; No. 18 of the SciVerse ScienceDirect Top 25 for Jan.Dec. 2011 – IJSS)
 35. Gao, X.L. (2004). On the complex variable displacement method in plane isotropic elasticity. Mech. Res. Comm. 31, 169173.
 34. Gao, X.L. and Li, K. (2003). Finite deformation continuum model for singlewalled carbon nanotubes. Int. J. Solids Struct. 40, 73297337.
Dr. XinLin Gao is currently a professor of Mechanical Engineering at Southern Methodist University (SMU). His other experience includes teaching at University of Texas at Dallas for 3 years, at Texas A&M University for 7 years, at Michigan Tech for 4 years, and working at the Air Force Institute of Technology and the Air Force Research Lab for about 2.5 years. He was a visiting professor at University of ParisEast in MayJune 2010 and has been a chair professor (visiting) at East China University of Science and Technology (ECUST) in Shanghai. He was elected an ASME Fellow in Jan. 2011.
He has conducted research in a variety of areas in mechanics and materials and is an author/coauthor of 101 published/accepted journal papers, two book chapters, and 113 conference and other publications. The topics covered in his publications include micro and nanomechanics, multiscale materials modeling, polymer and metal matrix nanocomposites, higherorder elasticity and plasticity theories, cellular materials, indentation/contact mechanics, traumatic brain injury, fabricreinforced composites, textile materials, pressure vessel design, metal cutting simulations, and computational mechanics (finite element method, Green’s function method, variational principles, matrix method for spatial frames, Voronoi tessellation, Monte Carlo method, and molecular dynamics simulations). His work has been funded by NSF, Army, AFOSR, AFRL, DOE, and industries. He has been a reviewer for 92 international journals, 9 publishers and 14 funding organizations and has organized 22 symposia at major technical conferences. He served as the Chair of the ASME/Boeing Structures and Materials Best Paper Award Committee in 2006 and 2007. He currently serves on the editorial boards of six journals.