首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Determination of applicable local porosity distributions in a powder bed by the maximum entropy method
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Determination of applicable local porosity distributions in a powder bed by the maximum entropy method

机译:用最大熵法确定粉末床中适用的局部孔隙率分布

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Wick debinding can reduce the debinding cycle time and is a crucial technique in metal powder injection molding (MIM).The porosity of the compact varies locally,but there are few literature reports on determining the porosity distribution of the compact in MIM.The need for measuring porosity distribution motivates this study.A local porosity distribution (LPD)is quoted and measured from the digital image of the pore structure.Applicable LPDs and typical length scales are then calculated by the maximum entropy method.Proper theoretical porosity distribution functions are adopted to fit the applicable LPDs.According to the theoretical distribution function,a random number generator is used to generate data of porosity with quantitative randomness for engineering research.Results indicate that the typical length scale is essential and important for the numerical simulation in determining the size of the control volume (or grid).
机译:芯吸脱脂可以减少脱脂周期,是金属粉末注射成型(MIM)的一项关键技术。压坯的孔隙率局部变化,但有关确定MIM中压坯孔隙率分布的文献报道很少。测量孔隙度分布是本研究的动力,从孔隙结构的数字图像中引出并测量了局部孔隙度分布(LPD),然后通过最大熵方法计算出适用的LPD和典型的长度尺度,并采用了适当的理论孔隙度分布函数根据理论分布函数,使用随机数生成器生成具有定量随机性的孔隙度数据,以进行工程研究。结果表明,典型的长度尺度对于确定尺寸的数值模拟至关重要且很重要。控制音量(或网格)。

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