臺灣博碩士論文加值系統

本文是以四0公厘槍榴彈為研究對象，應用非線性有限單元法及CAD/CAM方法中ANSYS套裝軟體，進行不同藥筒斷面於擊發狀態下的變形模擬，此變形模擬乃考慮彈塑性大變形，因此討論藥筒重量是否有最輕量化的條件，及藥筒結構強度、尺寸限制因素等為本文重點。
當槍彈擊發後藥筒與槍膛一起膨脹，此時藥筒係以彈塑性大變形方式進行膨脹，為了使藥筒易於擊發後退殼，藥筒膨脹後產生的彈性回復，必須大於槍膛的彈性回復，否則藥筒與槍膛將發生干涉，造成退殼困難，使藥筒上部仍被留置於槍膛中。因此藥筒與槍彈的彈塑性膨脹行為，以及彈性回復影響二者之間的間隙，成為槍彈退殼作用研究重要的一環。
藥筒在擊發時的爆炸威力時驚人，並有效應力會隨時間增加而增加，但發生時間不一定是爆炸力最高時。在初次發生降伏時間上，斷面越大發生時間越晚，因為勁度變小柔度增加的關係。在殘留變形可斷面越大筒底尖點越明顯。在比較不同斷面的藥筒各項力學行為與變形情況，結果發現不管斷面何任何方式的比較大致相同，因此可知只要將所分析參數指定好原斷面是可以輕量化。最後在間隙方面的討論可知殘留變形相當小，雖假設藥筒與藥室間隙為零，但由殘留變形的值看出，只要間隙設計得當並不會影響彈殼藥筒退殼。

摘要…………………………………………………………Ⅰ
目錄…………………………………………………………Ⅱ
表目錄………………………………………………………Ⅳ
圖目錄………………………………………………………Ⅴ

第一章　緒論
§ 1-1 前言………………………………………………1
§ 1-2 研究動機…………………………………………2
§ 1-3 文獻回顧…………………………………………3
§ 1-4 研究方向…………………………………………6
第二章　ANSYS分析方法
§ 2-1 ANSYS介紹 ………………………………………8
§ 2-2 ANSYS分析架構…………………………………10
第三章　ANSYS理論基礎
§ 3-1 基本觀念 ………………………………………14
§ 3-2 非線性問題解法 ………………………………23
第四章　藥筒彈塑性模型之建立
§ 4-1 建立藥筒ANSYS模型……………………………41
§ 4-2 藥筒材料 ………………………………………42
§ 4-3 邊界條件 ………………………………………42
§ 4-4 壓力負荷 ………………………………………43
第五章　藥筒於擊發狀態下之模擬
§ 5-1 斷面一變形模擬 ………………………………50
§ 5-2 不同斷面變形模擬比較 ………………………52
§ 5-3 結果分析與討論 ………………………………53
第六章　結論與建議
§ 6-1 結論 ……………………………………………70
§ 6-2 建議 ……………………………………………72

參考文獻 …………………………………………………73
自 述………………………………………………………77

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