【摘要】：基于砂土多孔、含水的特性,對動(dòng)載荷作用下孔隙演化對砂土沖擊絕熱關(guān)系的影響進(jìn)行了研究�；谏巴粱w的不可壓縮假設(shè),采用單個(gè)球形氣孔等效模型和廣義Mises屈服準(zhǔn)則推導(dǎo)了砂土考慮孔隙壓實(shí)的演化方程;根據(jù)沖擊Hugoniot突躍條件和Grüneisen型方程,獲得了砂土考慮孔隙演化的狀態(tài)方程;根據(jù)混合物沖擊波關(guān)系和孔隙演化狀態(tài)方程,獲得了砂土基體材料沖擊絕熱關(guān)系、干砂土和濕砂土沖擊絕熱關(guān)系,并與已有實(shí)驗(yàn)結(jié)果進(jìn)行了對比。結(jié)果表明:計(jì)算得到的絕熱線與實(shí)驗(yàn)數(shù)據(jù)吻合較好,該孔隙演化狀態(tài)方程能夠較為準(zhǔn)確的反映動(dòng)載作用下砂土的動(dòng)態(tài)響應(yīng)過程。
[Abstract]:Based on the characteristics of porous and water-bearing sand, the influence of pore evolution on the impact insulation relationship of sand under dynamic load is studied. Based on the incompressibility assumption of sand matrix, the evolution equation of sand considering pore compaction is derived by using the equivalent model of single spherical pore and the generalized Mises yield criterion, and the equation of state of sand considering pore evolution is obtained according to the shock Hugoniot jump condition and Gr 眉 neisen type equation. According to the shock wave relationship of the mixture and the equation of state of pore evolution, the impact insulation relationship of sand matrix material and the impact insulation relationship between dry sand and wet sand are obtained and compared with the existing experimental results. The results show that the calculated absolute hot line is in good agreement with the experimental data, and the equation of state of pore evolution can accurately reflect the dynamic response process of sand under dynamic load.
【作者單位】： 南京理工大學(xué)智能彈藥國防重點(diǎn)學(xué)科實(shí)驗(yàn)室;解放軍理工大學(xué)爆炸沖擊防災(zāi)減災(zāi)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金面上項(xiàng)目(51478466);國家自然科學(xué)基金青年項(xiàng)目(51508568) 爆炸科學(xué)與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(KFJJ15-07M)
【分類號】：O34
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本文編號：2506975