| 摘要: | 長久以來，子彈撞擊對於標靶之破壞行為(或可稱穿刺行為)一直是國防工業歷久不衰的研究主題。相關研究文獻顯示，標靶材料之組成、彈頭幾何形狀與撞擊入射角都將與破壞行為息息相關。故此，本研究即基於過往研究中之實驗結果，透過數值模擬方法中之物質點法探討子彈撞擊於金屬薄板的力學行為，藉由改變彈頭幾何形狀、入射角度和初始速度探討此些條件與撞擊後破壞行為之關係。
而本論文選用物質點法為計算方法之主因為，物質點法系歸屬於力學數值方法中之質點法，有別於網格法，物質點法對於大變形、高速撞擊與破壞行為有計算上之優勢。
有鑑於此，本論文將物質點法之計算成果與文獻中之實驗與有限元素法模擬分析之成果相互比擬，探討子彈撞擊模擬之適用組成律、破壞模型、力學特性等以及最重要的物質點法之適用性。此一系列相關成果預期可作為質點法、破裂力學、彈道衝擊等研究領域之參考資料。
;For a long time, the behavior of bullet impacts on targets, also known as penetration behavior, has been a persistent research topic in the defense industry. Relevant research literature indicates that the composition of target materials, the geometry of the bullet, and the angle of impact are all closely related to the damage behavior. Therefore, this study, based on experimental results from previous research, investigates the mechanical behavior of bullet impacts on metal plates using the Material Point Method (MPM) in numerical simulations. By varying the bullet geometry, angle of incidence, and initial velocity, this study explores the relationship between these conditions and the damage behavior post-impact.
The primary reason for selecting the Material Point Method as the computational method in this paper is that MPM belongs to the category of particle methods in numerical mechanics. Unlike mesh-based methods, MPM has computational advantages for large deformations, high-speed impacts, and damage behavior.
In view of this, this paper compares the computational results of MPM with experimental and finite element method (FEM) simulation results from the literature. It explores the applicable constitutive laws, damage models, mechanical properties, and, most importantly, the applicability of MPM for simulating bullet impacts. This series of related results is expected to serve as reference material for research fields such as particle methods, fracture mechanics, and ballistic impacts. |
