新聞資訊
準靜態和動態加載TA2工業純鈦受迫剪切破壞演化
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-04
采用扁平閉合帽形試樣，利用材料試驗機(MTS)和分離式霍普金森壓桿(SHPR)作為加載手段，結合數字圖像相關法(DIC)和金相分析，研究準靜態和動態加載下帽型試樣發生受迫剪切的破壞特征和力學響應。
準靜態和動態加載TA2工業純鈦受迫剪切破壞演化Quasi-static and dynamic failure evolution oftitanium alloy under forced shear loading
采用扁平閉合帽形試樣，利用材料試驗機(MTS)和分離式霍普金森壓桿(SHPR)作為加載手段，結合數字圖像相關法(DIC)和金相分析，研究準靜態和動態加載下帽型試樣發生受迫剪切的破壞特征和力學響應。結果表明：準靜態加載下失效由塑性損傷累積導致的裂紋形成并擴展引起；動態加載下，失效模式為絕熱剪切失效。準靜態加載下，剪切變形區始終保持一定寬度；而動態加載下，剪切區寬度逐漸減小，直到高度局部化的絕熱剪切帶形成，且準靜態加載剪切區寬度明顯大于動態加載剪切寬度。
Combined with the digital image correlation (DIC) and metallographic methods, a flat-hat-shaped specimen was loaded by the material testing system (MTS) and splited Hopkinson pressure bar (SHPB) to study the quasi-static and dynamic forced shear failure behavior and mechanical response of commercial pure titanium (CP-Titanium). The results show that the quasi-static failure is caused by the accumulation of plastic damage, while the dynamic collapse is caused by adiabatic shear localization. Furthermore, the shear zone approximately keeps a constant width, the width of shear zone continually narrowdown from a plastic region to a narrow band, namely adiabatic shear band, under dynamic loading. Moreover, the width of quasi-static loading is evidently lager than that of the dynamic loading.
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