Accuracy and precision assesment of stochastic simulation tools for springback variation

The sheet forming industry is plagued by inherent variations in its many input variables, making quality control and improvements a major hurdle. This is particularly poignant for Advanced High Strength Steels (AHSS), which exhibit a large degree of property variability. Current FE-based simulation packages are successful at predicting the manufacturability of a particular sheet metal components, however, due to their numerical deterministic nature are inherently unable to predict the performance of a real-life production process. Though they are now beginning to incorporate the stochastic nature of production in their codes. This work investigates the accuracy and precision of a current stochastic simulation package, AutoForm Sigma v4.1, by developing an experimental data set where all main sources of variation are captured through precise measurements and standard tensile tests. Using a Dual Phase 600Mpa grade steel a series of semi-cylindrical channels are formed at two Blank Holder Pressure levels where the response metric is the variation in springback determined by the flange angle. The process is replicated in AutoForm Sigma and an assessment of accuracy and precision of the predictions are performed. Results indicate a very good correspondence to the experimental trials, with mean springback response predicted to within 1 &deg; of the flange angle and the interquartile spread of results to within 0.22&deg;.<br /

Recomendações para a produção de mudas de cajueiro em tubetes.

Recomendacoes para a producao de mudas de cajueiro em tubetes.bitstream/item/33816/1/Ct-068.pd

Avaliação dos métodos de propagação de algumas spondias agroindustriais.

A Embrapa Agroindústria Tropical vem desenvolvendo pesquisas sobre os métodos de propagação, visando ao aumento da germinação, clonagem de genótipos superiores para produção de mudas, domesticação e cultivo em escala comercial.bitstream/CNPAT-2010/11954/1/Ct-031.pd

Produção de mudas das Spondias cajazeira, cajaraneira, cirigueleira, umbu-cajazeira e umbuzeiro.

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Alternativas para o manejo de lebres em pomares de citros.

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Aspectos biométricos e de produção da cultivar 'BRS Morena' em cultivo protegido.

O objetivo do presente trabalho foi avaliar o efeito da cobertura plástica sobre o desenvolvimento da área foliar, dos ramos e dos fatores de produção da cultivar BRS Morena.Resumo