Now showing items 1-20 of 30

    • Buckling of a Pressurized Hemispherical Shell Subjected to a Probing Force 

      Marthelot, Joel; López Jiménez, Francisco; Lee, Anna; Hutchinson, John; Reis, Pedro M. (ASME International, 2017-10-19)
      We study the buckling of hemispherical elastic shells sub- jected to the combined effect of pressure loading and a prob- ing force. We perform an experimental investigation using thin shells of nearly uniform thickness ...
    • Calibration Procedures for a Computational Model of Ductile Fracture 

      Xue, Z; Pontin, M. G.; Zok, F. W.; Hutchinson, John W. (Elsevier, 2010)
      A recent extension of the Gurson constitutive model of damage and failure of ductile structural alloys accounts for localization and crack formation under shearing as well as tension. When properly calibrated against a ...
    • Cohesive Traction-Separation Laws for Tearing of Ductile Metal Plates 

      Nielsen, K. L.; Hutchinson, John W. (Elsevier, 2012)
      The failure process ahead of a mode I crack advancing in a ductile thin metal plate or sheet produces plastic dissipation through a sequence of deformation steps that include necking well ahead of the crack tip and shear ...
    • Comparison of Mechanical Properties of Ni[sub]3Al Thin Films in Disordered FCC and Ordered L1[sub]2 Phases 

      Huang, Yucong; Aziz, Michael; Hutchinson, John; Evans, Anthony G.; Saha, R.; Nix, Wiliam D. (Elsevier Science B.V., Amsterdam, 2001)
      We report the results of several experiments isolating the effect of long-range order on mechanical properties of intermetallic compounds. Kinetically disordered FCC Ni<sub>3</sub>Al (Ni 76%) thin films were produced by ...
    • Concepts for Enhanced Energy Absorption Using Hollow Micro-Lattices 

      Evans, A. G.; He, M. Y.; Deshpande, V.S.; Hutchinson, John W.; Jacobsen, A. J.; Barvosa-Carter, W. (Elsevier, 2010)
      We present a basic analysis that establishes the metrics affecting the energy absorbed by multilayer cellular media during irreversible compaction on either a mass or volume basis. The behaviors at low and high impulse ...
    • A Critical Assessment of Theories of Strain Gradient Plasticity 

      Evans, Anthony G.; Hutchinson, John W. (Elsevier, 2009)
      Theories to extend plasticity to the micron scale have been in existence for over a decade, complemented by a growing body of experimental data. Here, materials and mechanics aspects of two prominent strain gradient theories ...
    • Crossover Patterning by the Beam-Film Model: Analysis and Implications 

      Zhang, Liangran; Liang, Zhangyi; Hutchinson, John; Kleckner, Nancy (Public Library of Science, 2014)
      Crossing-over is a central feature of meiosis. Meiotic crossover (CO) sites are spatially patterned along chromosomes. CO-designation at one position disfavors subsequent CO-designation(s) nearby, as described by the ...
    • Deformation and Fracture of Impulsively Loaded Sandwich Panels 

      Wadley, Haydn N. G.; Børvik, Tore; Olovsson, Lars; Wetzel, John J.; Dharmasena, Kumar P.; Hopperstad, Odd Sture; Deshpande, Vikram; Hutchinson, John W. (Elsevier, 2013)
      Light metal sandwich panel structures with cellular cores have attracted interest for multifunctional applications which exploit their high bend strength and impact energy absorption. This concept has been explored here ...
    • From Wrinkles to Creases in Elastomers: The Instability and Imperfection-Sensitivity of Wrinkling 

      Cao, Yanping; Hutchinson, John W. (The Royal Society, 2012)
      The stability of the wrinkling mode experienced by a compressed half-space of neo-Hookean material is investigated using analytical and numerical methods to study the post-bifurcation behaviour of periodic solutions. It ...
    • Generalizing \(J_2\) Flow Theory: Fundamental Issues in Strain Gradient Plasticity 

      Hutchinson, John W. (Springer Verlag, 2012)
      It has not been a simple matter to obtain a sound extension of the classical \(J_2\) flow theory of plasticity that incorporates a dependence on plastic strain gradients and that is capable of capturing size-dependent ...
    • The Influence of Transient Thermal Gradients and Substrate Constraint on Delamination of Thermal Barrier Coatings 

      Sundaram, S.; Lipkin, D. M.; Johnson, C. A.; Hutchinson, John W. (American Society of Mechanical Engineers, 2013)
      A systematic study of factors affecting the delamination energy release rate and mode mix of a thermal barrier coating attached to a substrate is presented accounting for the influence of thermal gradients combined with ...
    • Knockdown Factors for Buckling of Cylindrical and Spherical Shells Subject to Reduced Biaxial Membrane Stress 

      Hutchinson, John W. (Elsevier, 2010)
      Cylindrical shells under uniaxial compression and spherical shells under equi-biaxial compression display the most extreme buckling sensitivity to imperfections. In engineering practice, the reduction of load carrying ...
    • Lifetime Assessment for Thermal Barrier Coatings: Tests for Measuring Mixed Mode Delamination Toughness 

      Hutchinson, Robert G.; Hutchinson, John W. (John Wiley & Sons, 2011)
      Mechanisms leading to degradation of the adherence of thermal barrier coatings (TBC) used in aircraft and power generating turbines are numerous and complex. To date, robust methods for the lifetime assessment of coatings ...
    • Localized Ridge Wrinkling of Stiff Films on Compliant Substrates 

      Zang, Jianfeng; Zhao, Xuanhe; Cao, Yanping; Hutchinson, John W. (Elsevier, 2012)
      Wrinkling of thin stiff films on thick compliant elastomeric substrates subject to plane strain compression is considered for cases in which the substrate is pre-stretched prior to film attachment. Advanced wrinkling modes ...
    • Nanopore Fabrication in Amorphous Si: Viscous Flow Model and Comparison to Experiment 

      George, H. Bola; Tang, Yuye; Chen, Xi; Li, Jiali; Hutchinson, John W.; Golovchenko, Jene A.; Aziz, Michael J. (American Institute of Physics, 2010)
      Nanopores fabricated in free-standing amorphous silicon thin films were observed to close under 3 keV argon ion irradiation. The closing rate, measured in situ, exhibited a memory effect: at the same instantaneous radius, ...
    • Necking Modes in Multilayers and their Influence on Tearing Toughness 

      Hutchinson, John W. (SAGE Publications, 2013)
      Periodic bifurcation modes that occur in ductile multilayered plates or sheets stretched in plane strain tension are analyzed to reveal whether necks are likely to localize at the scale of the thickness of individual layers ...
    • Nonlinear Buckling Interaction for Spherical Shells Subject to Pressure and Probing Forces 

      Hutchinson, John; Thompson, Michael T. (ASME International, 2017-04-12)
      Elastic spherical shells loaded under uniform pressure are subject to equal and opposite compressive probing forces at their poles to trigger and explore buckling. When the shells support external pressure, buckling is ...
    • Numerical Simulation of Cropping 

      Tvergaard, Viggo; Hutchinson, John Woodside (ASME International, 2014)
      Cropping is a cutting process whereby opposing aligned blades create a shearing failure by exerting opposing forces normal to the surfaces of a metal sheet or plate. Building on recent efforts to quantify cropping, this ...
    • Periodic Patterns and Energy States of Buckled Films on Compliant Substrates 

      Cai, Shengqiang; Breid, Derek; Crosby, Alfred J.; Suo, Zhigang; Hutchinson, John W. (Elsevier, 2011)
      Thin stiff films on compliant elastic substrates subject to equi-biaxial compressive stress states are observed to buckle into various periodic mode patterns including checkerboard, hexagonal and herringbone. An experimental ...
    • Probing Shells Against Buckling: A Nondestructive Technique for Laboratory Testing 

      Thompson, J. Michael T.; Hutchinson, John; Sieber, Jan; Hutchinson, John (World Scientific Pub Co Pte Lt, 2017-12-30)
      This paper addresses testing of compressed structures, such as shells, that exhibit catastrophic buckling and notorious imperfection sensitivity. The central concept is the probing of a loaded structural specimen by a ...