臺灣博碩士論文加值系統

本論文以球形空腔膨脹理論對0.30吋穿甲彈撞擊鋁質靶體的貫入行為進行探討，主要探討影響子彈貫入深度的因素，藉由理論分析法、數值模擬法及槍擊實驗獲得的子彈貫入深度，再進行分析比較，本研究可概括為三個部分；一、以球形空腔膨脹理論推導彈體貫入靶體之深度公式；二、進行0.30吋穿甲彈貫入鋁質靶體之槍擊實驗，利用X光照射鋁質靶體以取得子彈之貫入深度；三、運用ANSYS/LS-DYNA有限元模擬軟體模擬槍擊實驗以獲得貫入深度。將三種數據分析比較後獲得以下結論：在探討理論公式方面，比較動摩擦係數μ對貫入深度的影響時，發現μ值愈大，則貫入過程中所受的阻力愈大，貫入深度將愈小；而比較彈頭形狀參數 時，發現 值愈大，貫入深度亦愈深，但影響效果不比動摩擦係數顯著。在比較不同動摩擦係數後，發現當μ = 0.05時與實驗值相當接近。同時，數值模擬結果與實驗之貫入深度也非常接近。

This study is to investigate the behavior of 0.30-inch armor piercing projectile penetrating aluminum target, focusing on the factors affecting penetration depth, by spherical cavity expansion theory. We performed theoretical analysis, numerical simulation and experiments of projectile impacting aluminum target to obtain data of penetration depth and then to compare and analyze them. Three parts are included in this study: 1.The equation of penetration depth by spherical cavity expansion theory was derived. 2.The experiments of 0.30-inch armor piercing projectile penetrating aluminum target were performed and penetration depth was obtained by using X-ray. 3.ANSYS/LS-DYNA was used to simulate the impact and then penetration depth was obtained. Some results were obtained from above data: In theoretical data, it was found that the larger coefficients of kinetic friction (μ) assumed, the smaller penetration depth obtained. It was also found that the larger Caliber-Radius-Head (ψ), the deeper penetration depth, but the influence of ψ to penetration depth was less importance than μ. Comparison of three types of μ, it was found that when μ=0.05 applied, the penetration depth from model was closed to that from the experiments. Meanwhile, numerical simulation model could accurately predict the penetration depth.

誌謝 ii
摘要 iii
ABSTRACT iv
目錄 v
表目錄 vii
圖目錄 viii
符號說明 x
1. 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 2
1.3 研究範圍與限制 5
1.4 研究方法與架構 5
2. 球形空腔膨脹理論 7
2.1 基本假設 7
2.2 控制條件 7
2.3 質量和動量守恆方程 10
2.4 彈體貫入深度預測 12
3. 實驗規劃和實驗方法 24
3.1 前言 24
3.2 實驗規劃 24
3.3 實驗方法 26
3.4 實驗結果 32
4. LS-DYNA數值模擬 37
4.1 LS-DYNA發展及軟體簡介 37
4.2 數值模擬模型建立 38
4.3 撞擊模擬各項條件設定 40
4.4 模擬材料之屬性及參數設定 41
4.5 設定模擬靶板的元素破壞準則 43
4.6 模擬彈體貫入深度 44
5. 結果分析與比較 45
5.1 射擊實驗數據分析 45
5.2 有限元模擬數據與實驗值比較 47
5.3 實驗及模擬的破壞情況比較 48
5.4 理論計算值與實驗值之比較與分析 50
5.5 不同彈頭形狀模擬及理論深度比較與分析 56
5.6 實驗、模擬及理論貫入深度比較 58
6. 結論與建議 61
6.1 結論 61
6.2 後續研究方向與建議 62
參考文獻 63
自傳 66

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