...Mohammad Ali Ansari; Hemant Agiwal; Daniel Franke; Michael Zinn; Frank E. Pfefferkorn; Shiva Rudraraju This study employs a high-fidelity numerical framework to determine the plastic material flow patterns and temperature distributions that lead to void formation during friction stir welding (FSW...

.... This correlation is obtained in the phase-space relating in-plane reaction forces on the tool to the tool rotation angle. We focus on the interactions of the tool geometry and tool motion with the surrounding material undergoing plastic deformation and deduce novel insights into various correlations of tool motion...

... Conference, Oct. 12–15, Erie, PA, Paper No. MSEC2010-34168. [24] Chaboche , J. L. , 2008 , “ A Review of Some Plasticity and Viscoplasticity Constitutive Theories ,” Int. J. Plast. , 24 , pp. 1642 – 1693 . 10.1016/j.ijplas.2008.03.009 [25] Simulia Co., 2008 , Abaqus Users' Manuals (v. 6.8...

... of the actuator during a heating stage of the process. laser thermal adjustment actuator thermal strain elastic plasticity Laser thermal adjustment derives from laser forming by transferring this technology to the domain of microsystems. As microcomponents are typically difficult to access...

... at L 2 dimensions with varying contact forces. To reduce variability, a new specimen was used for each test, and the applied force did not exceed the yield strength of Ti-G2 at these dimensions, so plastic deformation did not occur. From the figure, it can be seen that there is a strong inverse...

... dimension control, size effect, and tool wear progression in micromachining of hardened tool steels are experimentally investigated. A strain gradient plasticity model is developed for micromachining of hardened H13 tool steel. Novel 2D finite element (FE) models are developed in software ABAQUS to simulate...

... that are generally neglected in the macroscale cutting models must be incorporated into the micromachining models. Diamond turning and mechanical nanomanufacturing techniques also require an understanding of crystallographic effects during material removal. This work presents a rate-sensitive plasticity-based...

... plasticity-based machining (RSPM) model developed in Part I. The five material parameters, including four hardening parameters and the exponent of rate sensitivity, for both single-crystal aluminum and single-crystal copper are calibrated from the single-crystal plunge-turning data using a Kriging-based...

... to preserve the computational efficiency of inverse FEM, a pseudodeformation theory of plasticity based constitutive equation is proposed, which can well reflect the actual forming condition such as elastic/plastic deformation or loading/unloading condition. The above-mentioned improvements are implemented...

... as a result of calculating the quantities involved in the fracture criterion by means of the solution to a boundary value problem of the plasticity theory describing a metal forming process and, by assumption, is applicable everywhere in the workpiece, not only at the free surface where the linear relation...

... agreement with the temperatures measured in the experiment. Also, the model was able to predict in a reasonable fashion the stresses and plastic strains in the plates. 17 12 2008 16 12 2009 25 01 2010 25 01 2010 finite element analysis friction friction welding mechanical...

... into the effects of the electric field. aluminium alloys aluminium manufacture elastic deformation electric current electric heating finite element analysis plasticity stress-strain relations tensile strength tensile testing Due to the limited formability, complex metallic parts are frequently...

..., conventional plasticity theory employed in previous studies needs to be re-examined due to the length scale effect. In the present work, the length scale effects in microscale laser shock peening have been investigated. The crystal lattice rotation underneath the shocked surface was determined via electron...

...) and volume (plasticity) softening effects. In the presented work, an attempt has been made to simulate the ultrasonic welding of metals by taking into account these effects (surface and volume). A phenomenological material model has been proposed, which incorporates these two effects (i.e., surface...

.... Joseph , eds., International Ballistics Committee , The Hague, Netherlands , pp. 541 – 547 . Mcdowell , D. L. , 1997 , “ An Approximate Algorithm for Elastic-Plastic Two-Dimensional Rolling/Sliding Contact ,” Wear 0043-1648 , 211 ( 2 ), pp. 237 – 246 . 10.1016/S0043-1648(97)00117-8...

...C. Y. Seemikeri; P. K. Brahmankar; S. B. Mahagaonkar Biomedical manufacturing technologies are assuming highly visible position at the frontiers of manufacturing. A new field, “engineered surfaces,” is emerging as a more effective and economic route to successful manufacture. Low plasticity...

... configurations are geometrically determined to consider the deformation paths; two new efficient algorithms of plastic integration are proposed to consider the loading history. In the direct scalar algorithm (DSA), an elastic unloading-reloading factor γ is introduced to deal with the bending-unbending effects...

... to a nonuniform distribution of plastic strain and measured hardness and, thus, the curving tendency. Microhardness tests of the initial billet material and tensile test specimens are also presented as supplementary analyses. Comprehensive reviews of microforming can be found in the works of Geiger et al. ( 1...

... by the scaling parameter n , to the Hall–Petch equation. The scaling model offers a simple way to model the size effect down to length scales of a couple of grains and to extend the use of continuum plasticity theories to micro/mesolength scales. 19 09 2005 04 12 2006 forming processes...

... crystal silicon was experimentally characterized to better understand its effects on thin films response to μ LSP . The experimental result is favorably compared with finite element method simulation based on single-crystal plasticity. Laser shock peening (LSP) produces a compressive residual stress...