...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...

... analysis plasticity battery tab copper aluminum Ultrasonic welding creates a solid-state bond using ultrasonic energy. It is capable of creating a joint not only between similar metals but also between dissimilar metals or even between metals and plastics. It has the advantage of requiring...

... temperature in its upper part where the laser is applied. The second is that the material behavior of the upper part of the actuator behaves like a perfectly plastic material during the heating stage, whereas the lower part of the actuator behaves like an elastic material. The third is that the deformation...

...-assisted forming (EAF) process. 01 04 2011 22 08 2011 22 12 2011 22 12 2011 forming processes plasticity titanium alloys Automotive and aerospace companies are an integral part of the metal forming industry in the United States, and they are constantly searching...

... 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...

... cold working ductile fracture forming processes hot working metalworking plasticity product design ductile fracture metal forming plasticity Reviews of ductile fracture criteria are provided, for example, in Refs. 1 2 3 . Upsetting is a typical test for determining parameters...

... 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...

... loop systems internal stresses laser beam applications plasma confinement shock waves surface treatment laser shock peening analytical model residual stress high strain rate plasticity Laser shock peening (LSP) has been proposed as a competitive alternative technology...

...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. The hardness distribution along the length of the pins fabricated using the fine...

... 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 process The samples are copper thin...