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把电磁振动技术引入到金属粉末注射成型中，在一定的工艺条件下，逐步调节振动频率和振幅，制备出不同振动条件的注射型坯，并通过SEM等实验手段对型坯的物料分散状态和微观结构进行研究，以探讨振动频率和振幅对型坯微观结构的影响。结果表明：施加振动后，型坯微观结构均散程度大大提高，且随着振动频率或振幅的不断增大，均散程度逐渐达到最好后，均匀和完善程度有所降低，但仍然好于稳态成型时的状态。 相似文献
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振动剪切作用下LDPE和HDPE熔体的非仿射网络结构模型 总被引：1，自引：0，他引：1
We propose molten polymer‘s entanglement network deformation to be nonaffine and use transient network structural theory with the revised Liu‘s kinetics rate equation and the revised upper convected Maxwell constitutive equation to establish a nonaffine network Structural constitutive model for studying the rheological behavior of molten Low-Density Polyethylene(LDPE)and High Density Polyethylene(HDPE)in oscillatory shear.As a result,when the strain amplitude or frequency increases,the shear stress amplitude increases.At the same time,the accuracy of the nonaffine network model is higher than that of affine network model.It is clear that there is a small amount of nonaffine network deformation for LDPE melts which have long-chain branches,and there is a larger amount of nonaffine network deformation in oscillatory shear for HDPE melts which has no long-chain branches.So we had better consider the network deformation nonaffine when we establish the constitutive equations of polymer melts in oscillatory shear. 相似文献
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