Cowper-Symonds parameters estimation for ABS material using design of experiments with finite element simulation

<div><p>Abstract Polymers exhibit significant strain rate dependence in their mechanical strength. The impact simulations accuracy is associated with the use of mechanical properties obtained at high strain rates. These properties are often not available to engineers introducing a risk on the product development step. This paper presents a method for adjusting the parameters of the Cowper-Symonds, used for a constitutive material model, through computational experiments carried out considering the simulation of the Izod impact test.The proposed adjustment method allows reducing the Izod impact strength error from 44% to 2.4%.</p></div

Retention of beta-carotene in biofortified sweet potato chips after processing

Consumption of biofortified foods such as sweet potatoes with high content of beta-carotene may reduce deficiency of this micronutrient. The development of biofortified sweet potato chips expands the distribution and offers an alternative to the consumption of this product. The aim of this study was to evaluate the thermal blanching methods (steam and in boiling water) in beta-carotene retention in the production of dehydrated biofortified sweet potato chips with air circulation at 65 degrees C. The raw material, the chips blanched in steam and in boiling water had a content of beta-carotene of 501.86 +/- 53.65, 490.23 +/- 30.00 and 473.91 +/- 11.43 mu g g(-1) (d.b.) respectively. The retention of beta-carotene for steam and boiling water blanching was 97.7 and 94.4% respectively. The blanching conditions followed by drying used in the processing to obtain sweet potato chips were adequate as they resulted in beta-carotene high retention42COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPE