...Weike Yuan; Xinrui Niu; Gangfeng Wang Owing to the significant effects of adhesive force and surface/membrane tension, the classical contact models often fail to describe the indentation responses of soft materials and biological systems. This work addresses the axisymmetric indentation...

... that residual stresses or prestrains can affect indentation tests of different materials, including metals, glassy polymers, soft elastomers, and gels. Nevertheless, an indentation method for determining the state of residual stresses or prestrains of large magnitude in an elastomer is not yet available...

...Shengchen Liu; Kai-tak Wan A rigid inclusion is embedded at a finite depth in a soft layer resting on a rigid substrate. A spherical indenter presses vertically onto the surface, deforming the matrix and displacing the inclusion. A subsurface inclusion initially near the indentation axis moves...

... } which indicates that each of the three integrals involved has to be finite at any τ ∈ [ 1 , ∞ ) or r ∈ [ a , ∞ ) . For the second integral to be finite at τ  = 1, it is necessary from Eq. (A2) in the Appendix that the indentation depth of the punch has the form given in Eq...

... conditions and for both types of core, the sandwich beams containing front-and-back faces underwent indentation beneath the mid-span roller whereas Brazier plastic buckling was responsible for the collapse of sandwich beams absent the back face. Three-dimensional finite element (FE) predictions were in good...

...X. Yin; K. Komvopoulos Elastic-plastic indentation of a single-crystal half-space by a rigid cylinder was analyzed by discrete dislocation plasticity. Short-range dislocation interactions were modeled by a set of constitutive rules of dislocation emission, glide, pinning (by obstacles...

... beams in three-point bending: core shear, face microbuckling, face wrinkling, and indentation. Selected geometries of sandwich beams were tested to illustrate these collapse modes, with good agreement between analytic predictions and measurements of the failure load. Finite element (FE) simulations...

...Yin Zhang; Ya-pu Zhao Because of the large aspect ratio of its length to radius and the large surface area to volume ratio, the nanowire is highly flexural and susceptible to the adhesion influence. The bending deflection of nanowire and its adhesion effect make the previous indentation models...

... bristles of two brushes when pressed together. The adhesive strength of the system is promoted by high elastic modulus, high friction coefficient, large aspect ratio, and dense packing of the fibers. However, the design is limited by the compressive buckling, the compressive indentation or cracking...

... with platelike interfaces. Because Green’s function satisfies the traction-free surface, the interfacial displacement continuity and the interfacial traction discontinuity conditions, only the indentation surface area where the boundary condition is altered, are numerically discretized. Numerical results...

...Shane E. Flores; Michael G. Pontin; Frank W. Zok A mechanistic framework has been developed for interpreting scratch tests performed with spherical indenters on elastic∕plastic materials. The pertinent scaling relations have been identified through a plastic analysis and the model has been...

... cosine punch, and compare the results with Hertz’s solution. 12 09 2007 03 11 2007 17 07 2008 elasticity indentation mechanical contact polynomial approximation Contact pressure distribution between two surfaces has always been of great interest to engineers. Perhaps...

... of interface microslip, but quantitative comparison to the experiments supports the friction stress model. 17 04 2007 18 12 2007 05 05 2008 finite element analysis friction indentation interface phenomena nanocontacts slip stress effects The Oliver–Pharr approach...

...Masaki Omiya; Kikuo Kishimoto; Takashi Nakano The delamination of thin coating films from substrates is a critical issue for the reliability of micro- and nanoelectronic devices. Indentation methods have the potential to measure interfacial strength in micro- and nanofilm thickness coating films...

... fraction to a volume fraction near 5%. The default average Young’s moduli given by the MTS Nano XP system for the in-plane and the through-thickness directions are 4250 and 3470 MPa , respectively, determined from the unloading in the indentation load-displacement data, much higher than...

... stresses stress measurement light interferometry indentation finite element analysis cutting stress-strain relations Ring-core cutting combined with a resistance strain rosette (RSR) was used to measure residual stresses. Ring-core cutting method mills an annular groove to relieve residual...

.... It is an extension of Hertz’s solution, which concerns the contact of two elastic spheres. A general procedure on how to solve this kind of problem is presented. As an example, we consider the contact between a cone and a sphere. The relations among the radius of the contact area, the depth of the indentation...

... attached. In stage II, the core crushes and all of the constituents (wet and dry face and core) converge onto a common velocity. In stage III, the panel deflects and deforms, dissipating its kinetic energy by plastic bending, stretching, shearing, and indentation. The results provide insight about three...

... of Ceramic Crystals Subjected to Very Low Load (Nano)indentations ,” J. Mater. Res. 0884-2914 , 7 , pp. 450 – 473 . Lilleodden , E. T. , Bonin , W. , Nelson , J. , Wyrobek , J. T. , and Gerberich , W. W. , 1995 , “ In situ imaging of μN load indents into GaAs ,” J. Mater...

...Yong Hoon Jang The paper presents a numerical solution to the problem of a hot rigid indenter sliding over a thermoelastic Winkler foundation with a thermal contact resistance at constant speed. It is shown analytically that no steady-state solution can exist for sufficiently high temperature...