基于SHPB實(shí)驗(yàn)的擠壓AZ91D鎂合金動(dòng)態(tài)力學(xué)行為數(shù)值模擬

1、 第 24 卷第 8 期 周 霞，等：基于 SHPB 實(shí)驗(yàn)的擠壓 AZ91D 鎂合金動(dòng)態(tài)力學(xué)行為數(shù)值模擬 1973 圖 10 試件在 372 ms 處于卸載階段的 Mises 應(yīng)力 Fig. 10 Mises equivalent stress during unloading period of specimen at 372 ms 圖 11 試件上不同單元的應(yīng)力時(shí)程曲線 Fig. 11 Stress vs time curves of different units on specimen 圖 12 試件上 5 個(gè)單元等效應(yīng)變隨時(shí)間的變化曲線 Fig. 12 Equivalent stra

2、in vs time curves for five units on specimen 萬(wàn)試屋 材料測(cè)試論文分享小站 1974 中國(guó)有色金屬學(xué)報(bào) 2014 年 8 月 AZ91D 鎂合金進(jìn)行了壓縮實(shí)驗(yàn)， 獲得了其在不同應(yīng)變 率下的壓縮應(yīng)力應(yīng)變數(shù)據(jù)，且基于實(shí)驗(yàn)擬合了該擠 壓合金的 Johnson-Cook 本構(gòu)關(guān)系表達(dá)式。發(fā)現(xiàn)擠壓 AZ91D 鎂合金在室溫應(yīng)變速率條件下，隨著應(yīng)變速 率增加表現(xiàn)出較強(qiáng)的應(yīng)變速率強(qiáng)化效應(yīng)，其動(dòng)態(tài)塑性 流變應(yīng)力均高于準(zhǔn)靜態(tài)時(shí)的應(yīng)力。擠壓鎂合金較好的 動(dòng)態(tài)壓縮性能與鎂合金變形后出現(xiàn)拉伸孿晶導(dǎo)致二次 硬化有關(guān)。 2 在實(shí)驗(yàn)基礎(chǔ)上，建立了擠壓鎂合金試樣 SHPB 壓 縮

3、實(shí)驗(yàn) 的有 限 元模 型， 模 擬分 析了 應(yīng) 變速 率在 4001000 s1 范圍內(nèi)的壓縮應(yīng)力應(yīng)變行為，模擬結(jié) 圖 13 3 種應(yīng)變率下試件的應(yīng)力應(yīng)變曲線 Fig. 13 Stressstrain curves for specimen under three kinds of strain rates 果、擬合結(jié)果與實(shí)驗(yàn)結(jié)果基本一致，研究結(jié)果為金屬 高應(yīng)變率力學(xué)行為的研究提供了重要的手段和理論指 導(dǎo)。 REFERENCES 1 MORDIKE B L, EBERT T. Magnesium: Properties- 變率越高，試件的變形越大，產(chǎn)生的應(yīng)力也越大。為 了驗(yàn)證數(shù)值模擬的有效性，

4、將子彈入射速度為 20 m/s 即沖擊速率為 1101.4 s1 時(shí)的數(shù)值模擬結(jié)果、 擬合數(shù)據(jù) 及試驗(yàn)結(jié)果進(jìn)行了對(duì)比， 結(jié)果如圖 14 所示。 可以看出， 使用 Johnson-Cook 本構(gòu)模型來(lái)模擬擠壓 AZ91D 鎂合 金在受到動(dòng)態(tài)壓縮荷載時(shí)的力學(xué)響應(yīng)是合理的。 從擬合結(jié)果來(lái)看，在中等應(yīng)變大小情況下，數(shù)值 模擬結(jié)果與實(shí)驗(yàn)結(jié)果以及基于 Johnson-Cook 本構(gòu)模 型的擬合結(jié)果吻合得較好。但是在應(yīng)變比較大時(shí)，因 材料的應(yīng)變率效應(yīng)和溫度效應(yīng)耦合在一起，采用解耦 的 Johnson-Cook 模型描述材料的應(yīng)變率效應(yīng)將會(huì)存 在一定的不足。 4 3 2 applications-potent

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