Encontrados 35 documentos, a visualizar página 1 de 4

Silagem de milho e grão de sorgo como suplementos para vacas de descarte termin...

Avaliou-se o efeito da suplementação com silagem de milho ou grão de sorgo no desempenho e características da carcaça e da carne de vacas de descarte, submetidas ao pastejo restrito em pastagem de aveia (Avena strigosa) + azevém (Lolium multiflorum). Foram utilizadas 30 vacas mestiças Charolês-Nelore, com idade média de oito anos, distribuídas em igual número e ao acaso em três tratamentos: silagem de milho (TS...

Numerical study on the influence of initial anisotropy on optimal blank shape

http://www.sciencedirect.com/science/article/B6V36-4TG8K7H-1/2/f5bb6c39fe2ad213cc96ece4a2f3a08e

Sensitivity study on some parameters in blank design

Sensitivity study on various numerical parameters is necessary for modeling a process. It is important to determine the influence of such parameters in order to achieve robust design. Initial blank shape is a process parameter that controls the quality of a formed part. This paper describes a blank shape optimization procedure that uses three numerical tools to determine an optimal blank shape for a formed part...

Blank design for deep drawn parts using parametric NURBS surfaces

Deep drawing is a forming process controlled by a number of parameters. The initial blank shape is one of the most important process parameter that has a direct impact on the quality of the finished part. This paper describes a new method to determine the optimal blank shape for a formed part using the deformation behaviour predicted by finite element simulations and salient features of NURBS surfaces. The prop...

Material parameters identification: Gradient-based, genetic and hybrid optimiza...

This paper presents two procedures for the identification of material parameters, a genetic algorithm and a gradient-based algorithm. These algorithms enable both the yield criterion and the work hardening parameters to be identified. A hybrid algorithm is also used, which is a combination of the former two, in such a way that the result of the genetic algorithm is considered as the initial values for the gradi...

Numerical simulation and analysis on the deep drawing of LPG bottles

Deep drawing is one of the most used sheet metal forming processes in the production of automotive components, LPG bottles and household goods, among others. The formability of a blank depends on the process parameters such as blank holder force, lubrication, punch and die radii, die-punch clearance, in addition to material properties and thickness of the sheet metal. This paper presents a numerical study made ...

Influence of draw restraining force on the springback in advanced high strength...

Abstract Draw beads are used in sheet metal forming processes to regulate material flow and achieve higher quality in the parts. The draw beads impose draw restraining force on the blank which eliminates defects such as wrinkling, tearing and reduces springback. In a draw-bend test, the draw restraining force is imitated by the back force applied through a hydraulic ram. As the back force increases, large stra...

Uma análise do processo de avaliação pré-anestésica em consulta ambulatorial

Uma analise do processo de avaliação pré-anestésica em consulta ambulatorial

Influence of process parameters on the deep drawing of stainless steel

Optimization of process parameters in sheet metal forming is an important task to reduce manufacturing cost. To determine the optimum values of the process parameters, it is essential to find their influence on the deformation behaviour of the sheet metal. The significance of three important process parameters namely, die radius, blank holder force and friction coefficient on the deep-drawing characteristics of...