【摘要】：Taylor撞擊常用于測試材料的動(dòng)態(tài)屈服強(qiáng)度。泡沫壓縮密度與壓縮應(yīng)變的關(guān)系對泡沫子彈Taylor撞擊的理論分析起著重要的作用。本文通過引入塑性泊松比,得到了泡沫壓縮密度與壓縮應(yīng)變的準(zhǔn)確關(guān)系,進(jìn)一步建立了可壓縮泡沫子彈撞擊剛性靶板的理論模型。當(dāng)塑性泊松比為常數(shù)時(shí),文中建立的泡沫受壓后密度比的一階泰勒展開式可以退化到已有模型。當(dāng)塑性泊松比為塑性應(yīng)變和子彈相對密度的函數(shù)時(shí),相對密度會(huì)影響泡沫子彈的沖擊響應(yīng)歷程及最終變形,但對撞擊持續(xù)時(shí)間影響較小。同時(shí),初始速度也會(huì)影響子彈最終變形和撞擊持續(xù)時(shí)間。本文的理論工作可以為分析泡沫材料的動(dòng)態(tài)力學(xué)行為提供有益指導(dǎo)。
[Abstract]:Taylor impact is often used to measure the dynamic yield strength of materials. The relationship between compression density and compression strain plays an important role in the theoretical analysis of Taylor impact of foam bullets. By introducing the plastic Poisson's ratio, the accurate relationship between the compression density and the compression strain of the foam is obtained, and the theoretical model of the compressible foam bullet hitting the rigid target plate is further established. When the plastic Poisson's ratio is constant, the first order Taylor expansion of the density ratio of foam under compression can be reduced to the existing model. When the plastic Poisson's ratio is a function of the plastic strain and the relative density of the bullet, the relative density will affect the impact response history and the final deformation of the foam bullet, but has little effect on the impact duration. At the same time, the initial velocity also affects the final deformation and impact duration of the bullet. The theoretical work in this paper can provide useful guidance for the analysis of dynamic mechanical behavior of foam materials.
【作者單位】： 北京航空航天大學(xué)航空科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(11472035,11472034)~~
【分類號】：O344.2
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本文編號：2261976