本文選題：固體力學(xué) + Ti-合金��； 參考：《兵工學(xué)報(bào)》2015年09期

【摘要】：利用Taylor桿沖擊實(shí)驗(yàn)與數(shù)值模擬方法研究了Ti-5553鈦合金在高應(yīng)變率沖擊下的動(dòng)態(tài)行為。Ti-5553合金在兩種熱處理工藝處理后獲得了不同準(zhǔn)靜態(tài)力學(xué)性能的等軸組織和雙態(tài)組織。在泰勒桿沖擊實(shí)驗(yàn)的基礎(chǔ)上,應(yīng)用ANSYS/LS-DYNA有限元分析軟件研究了材料參數(shù)屈服強(qiáng)度值σs和失效應(yīng)變值εf的變化對(duì)Taylor桿沖擊能量、速度、加速度等過程參量和沖擊結(jié)果的影響,將σs值設(shè)定為1 170~1 400 MPa,εf設(shè)定為0.1~0.8.研究結(jié)果表明:屈服強(qiáng)度值的變化對(duì)沖擊前后能量、速度、加速度的改變量影響較小。隨著屈服強(qiáng)度值的增大,沖擊過程中能量、速度、加速度的變化速率有所增加,沖擊后試樣的應(yīng)變量減小;失效應(yīng)變值的變化對(duì)沖擊過程量有明顯影響;對(duì)等軸組織鈦合金,εf0.7時(shí),隨著失效應(yīng)變值的增大,能量、速度、加速度的變化速率逐漸增大,試樣沖擊后幾乎無回彈現(xiàn)象;當(dāng)εf≥0.7時(shí),過程參量曲線全部重合,試樣沖擊后有明顯回彈現(xiàn)象;當(dāng)設(shè)定εf=0.75和εf=0.35時(shí),等軸組織和雙態(tài)組織鈦合金分別符合真實(shí)Taylor桿沖擊變形特征。
[Abstract]:The dynamic behavior of Ti-5553 titanium alloy under high strain rate impact was studied by means of Taylor rod impact test and numerical simulation. After two heat treatment processes, the equiaxed structure and double state microstructure of Ti-5553 titanium alloy with different quasi-static mechanical properties were obtained.On the basis of Taylor bar impact test, the effect of material parameter yield strength 蟽 s and failure strain value 蔚 f on the impact energy, velocity and acceleration of Taylor rod was studied by using ANSYS/LS-DYNA finite element analysis software.The 蟽 s value is set to 1 170 ~ 1 400 MPA, and 蔚 f is 0. 1 ~ 0. 8.The results show that the change of yield strength has little effect on the change of energy, velocity and acceleration before and after impact.With the increase of yield strength, the change rate of energy, velocity and acceleration in the impact process increases, and the strain of the specimen decreases after impact, and the change of failure strain value has a significant effect on the impact process.With the increase of failure strain value, the change rate of energy, velocity and acceleration in iso-axial titanium alloy, 蔚 f 0.7, increases gradually, and there is almost no rebound phenomenon after impact, and when 蔚 f 鈮，

本文編號(hào)：1734415