In this paper, in order to improve the microstructure uniformity of an ultra-high strength martensitic steel with a greater than 2500 Mpa developed by multi-directional forging laboratory, single-pass hot compression experiment strain rate 0.01 1 s?1 and temperature 800 1150 °C was conducted. Based on experimental data, material parameters were determined, constitutive model considering influen...

Plunge depth is one of the most important process parameters that affect joint strength in refill friction stir spot welding (refill FSSW). In this study, a three-dimensional numerical model developed using Lagrangian incremental formulation DEFORM-3D to simulate FSSW thin AA7075-T6 sheets. The verified by comparing obtained temperatures at specific locations with from previous experimental stu...

We extend the well-known form closure framework for rigid parts to holding a class of deformable parts. We consider 2D deformable parts modeled as polygons with a triangular FEM mesh and given stiffness matrix that models linear elasticity and the potential energy associated with deformations of the mesh. We define the D-space (deformation-space) of a part E as the C-space of all nodes in the F...

– Building on the well-established form closure framework for holding rigid parts, this paper proposes a new framework for holding deformable parts. We consider the class of deformable parts that can be modeled as linearly elastic polygons with a triangular finite element mesh and given stiffness matrix. We define the D-space (deformation-space) of a part as the C-space of all its mesh nodes. F...

Designing flat sheets that can be made to deform into 3D shapes is an area of intense research with applications in micromachines, soft robotics, and medical implants. Thus far, such were designed adopt a single target shape. Here, we show through anisotropic deformation applied inhomogenously throughout sheet, it possible design sheet multiple surface geometries upon different actuations. The ...

In this study, a new Kirschner wire (K-wire) design was performed to fix bone fractures in orthopedic surgery. The numerical analyses were completed based on the finite element method (FEM), using Deform-3D software. kind of FEM, friction, material model, load and boundary conditions must be defined correctly. It has been seen that is more advantageous terms implant failure or stability fractur...

Phantomlike elastomer simulations do not always deform globally affinely in the way that classical theory predicts. Assuming that each crosslink will deform affinely with its topological neighbors gives much better results, and creates a way to isolate crosslinks with unpredictable deformation properties. The correlation of non-affinities and network properties depends on the constitutive model...

Mechanical meta-materials are 3D-printed flexible structures produced from smaller units arranged in repeating patterns. The shape and organization of these patterns determine how the materials will behave when we press on them. If individual following all rules for they like to change shape, material can deform easily it. However, if such that cannot simultaneously way like, is frustrated, it ...

Thin, viscous liquid films subjected to impact events can deform. Here we investigate free surface oil film deformations that arise due the air pressure buildup under impacting and rebouncing water drops. Using Digital Holographic Microscopy, measure 3D topography of deformed immediately after drop rebound, with a resolution down 20 nm. We first discuss how is initially during impact, as functi...

Abstract Rolling speed ratios during the rolling process are critical to ring forming in this pepper. The selected roll feed mode is constant with increasing of diameter main stage. Based on Deform-3D finite element software, a large size φ1530 mm was taken as research object. numerical model 40Cr13 stainless steel established. radial-axial rings under different increase speeds simulated, and c...