頁籤選單縮合
題名 | Analysis of Plastic Instability During Composite Rod Extrusion=複合材擠製時塑性不安定之解析 |
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作者 | 黃永茂; 黃德福; 沈政昌; | 書刊名 | 中國機械工程學刊 |
卷期 | 20:6 1999.12[民88.12] |
頁次 | 頁597-605 |
分類號 | 440.2 |
關鍵詞 | 複合材; 擠製; 塑性; Plastic instability; Composite rod extrusion; |
語文 | 英文(English) |
中文摘要 | 本研究為發展一在三軸應力下之塑性不安定判別準則,來預測軸對稱複合材擠製時硬質芯材塑性不安定之發生。因塑性不安定最可能發生在模具出口處,故此處之硬質芯材之應力態被用來建立塑性不安定判別準則之構成式。並有系統地探討複合材之初始半徑比、降伏應力比等各式擠製條件對臨界斷面積縮減率之影響。甚至使用由鋁及鉛所組成之複合材進行複合材擠製實驗。在以初始面積比為0.15之條件下,由解析預測之臨界縮減率與實驗值之比較,兩者相當吻合。 |
英文摘要 | A plastic instability criterion under a tri-axial stress state was developed in this study to predict the occurrence of plastic instability in the hard core layer during axisymmetric composite rod extrusion. Stress states in the core hard layer at the exit of the die, where plastic instability is most likely to occur, were employed to formulate the plastic instability criterion. The effects of various extrusion conditions, such as the initial radius ratio and yield stress ratio of the composite rods, etc., upon the critical area reduction, under which plastic instability can be avoided, were discussed systematically. Furthermore, experiments on composite rod extrusion were also conducted by employing aluminum and lead as layers of composite rods. It was found that the theoretical predictions of the critical area reduction were in good agreement with the experimental measurements with the initial area ratio of 0.15. |
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