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根据铝型材挤压模具的服役条件,采用宏观与微观相结合的分析方法,分析现场挤压模具的失效形式、失效性质和失效原因,并提出了提高模具使用寿命的一些措施. 相似文献
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V. L. Finkenstadt C.-K. Liu P. H. Cooke L. S. Liu J. L. Willett 《Journal of Polymers and the Environment》2008,16(1):19-26
Sorbitol and glycerol were used to plasticize sugar beet pulp-poly(lactic acid) green composites. The plasticizer was incorporated
into sugar beet pulp (SBP) at 0%, 10%, 20%, 30% and 40% w/w at low temperature and shear and then compounded with poly(lactic
acid) (PLA) using twin-screw extrusion and injection molding. The SBP:PLA ratio was maintained at 30:70. As expected, tensile
strength decreased by 25% and the elongation increased. Acoustic emission (AE) showed correlated debonding and fracture mechanisms
for up to 20% w/w plasticizer and uncorrelated debonding and fracture for 30–40% sorbitol and 30% glycerol content in SBP–PLA
composites. All samples had a well dispersed SBP phase with some aggregation in the PLA matrix. However, at 40% glycerol plasticized
SBP–PLA composites exhibited unique AE behavior and confocal microscopy revealed the plasticized SBP and PLA formed a co-continuous
two phase system.
相似文献
V. L. FinkenstadtEmail: |
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本文对一起叉车安全事故的直接原因进行分析,并分别讨论了叉车本身缺陷导致事故发生的可能性、驾驶人员自身的不规范操作,以及使用单位在制度建设及实施方面存在的缺陷. 相似文献
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此文介绍了硬铝合金薄壁杯形件成形工艺与模具设计的方法,分析了硬铝合金塑性差给冷挤压成形带来了困难的特点,从成形工艺、模具设计等方面采取了有效措施,从而较好地解决了硬铝合金在成形过程中产生的缺陷.此文也为类似零件艺及模具设计提供了参考. 相似文献
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分析了125型摩托车铝合金车轮的特点,介绍了车轮液态挤压成型模具的设计及液态挤压成型的整个工艺和生产过程中应注意的问题. 相似文献
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钢质零件在卧式肘杆挤压机上的反挤压是道难题.此文阐述了通过对冷挤压工艺及模具设计优化,实现了在卧式肘杆挤压机上高质高速反挤压钢质高强度零件,也扩大了卧式肘杆挤压机的应用范围. 相似文献
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