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基于试验数据的焊缝试样C^*参量估算 被引量:1
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作者 轩福贞 马春伟 +1 位作者 涂善东 王正东 《机械工程学报》 EI CAS CSCD 北大核心 2006年第8期195-200,共6页
针对焊缝和母材蠕变性能不相同的带焊缝CT试样,提出了一个等效均质材料模型,建立了焊缝中心裂纹、焊缝界面裂纹和非对称焊缝裂纹情况下由试验数据确定C^*参量的修正式。采用ABAQUS软件进行了带焊缝CT试样,参量的有限元分析。有限元... 针对焊缝和母材蠕变性能不相同的带焊缝CT试样,提出了一个等效均质材料模型,建立了焊缝中心裂纹、焊缝界面裂纹和非对称焊缝裂纹情况下由试验数据确定C^*参量的修正式。采用ABAQUS软件进行了带焊缝CT试样,参量的有限元分析。有限元数值解与修正式的预测值比较表明:与均质材料CT试样相比,低匹配焊缝会导致CT试样的ηw因子增大,高匹配焊缝会导致ηw因子值降低,采用ASTM E1457提供的公式在低匹配情况下会过低估算C^*参量,在高匹配情况下会过高估算C^*参量。无论是低匹配(M<1)焊缝还是高匹配(M〉1)焊缝,修正后CT试样的C^*参量计算式都可给出与有限元解非常接近的估算结果,可用于焊缝蠕变裂纹行为预测。 展开更多
关键词 材料不匹配 焊缝 蠕变裂纹扩展 CT试样 C^*参量
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Characterization of Grugru Palm Pulp for Food Applications
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作者 Dalany Menezes Oliveira Janaina de Paula da Costa +1 位作者 Edmar Clemente Jose Maria Correia da Costa 《Journal of Food Science and Engineering》 2013年第2期107-112,共6页
Studies are needed to know the grugru palm (Acrocomia aculeata) potential for food industry. This study aimed to characterize physicochemical quality and minerals in the mesocarp (pulp) of grugru palm, Grugru palm... Studies are needed to know the grugru palm (Acrocomia aculeata) potential for food industry. This study aimed to characterize physicochemical quality and minerals in the mesocarp (pulp) of grugru palm, Grugru palm fruits from NE Brazil production area were collected and analyzed. The determinations included: respiratory rate, sugars, soluble solids, pH, titratable acidity, humidity, water activity (aw), ashes, protein, lipids, total phenolics, total carotenoids, vitamin C, color and minerals. The fruit respiration rate was 74.45 mL CO2 kg-1 h1. High levels were found for sugars, soluble solids, pH, aw, lipids and carotenoids; however, the pulp showed low acidity, moisture and ashes. The values found for lipids, minerals and vitamin C are equivalent to those observed in the literature. The grugru palm fruit has a high rate of respiration, which turns necessary the use of conservation techniques and methods. The grugru palm fruit pulp shows physical quality parameters attractive to the consumer, physicochemical quality and nutritive composition which can be considered for food ingredients and alternative source of ingredient for supplementation of diet food for needy population. 展开更多
关键词 Grugru palm (Acrocomia aculeata) MESOCARP MINERALS carotenoids flavonoids.
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