本文選題：激光器 + 本構(gòu)模型　； 參考：《中國激光》2016年08期

【摘要】：基于Johnson-Cook(J-C)本構(gòu)模型,提出了基于有限元模型和修正Levenberg-Marquard(L-M)算法的參數(shù)辨識方法。對TC17材料進行不同參數(shù)、不同工藝的激光沖擊,得到了高應(yīng)變率條件下的殘余應(yīng)力場分布;利用霍普金森壓桿得到了中應(yīng)變率條件下TC17材料的動態(tài)響應(yīng)曲線;將上述兩個測試結(jié)果作為辨識目標。引入低應(yīng)變率條件下材料的響應(yīng)曲線作為約束條件,辨識得到了TC17鈦合金高應(yīng)變率條件下的J-C本構(gòu)模型參數(shù)。實驗和計算結(jié)果對比驗證表明,辨識得到的參數(shù)能比較準確地描述TC17鈦合金材料高應(yīng)變率條件下的動態(tài)響應(yīng)規(guī)律,并預(yù)測激光沖擊條件下材料的殘余應(yīng)力場分布。
[Abstract]:Based on the Johnson-Cookg J-C) constitutive model, a parameter identification method based on the finite element model and the modified Levenberg-MarquardL-M algorithm is proposed.The distribution of residual stress field at high strain rate was obtained by laser shock with different parameters and processes for TC17 materials, and the dynamic response curves of TC17 materials at medium strain rate were obtained by using Hopkinson pressure bar.The above two test results are used as identification targets.The J-C constitutive model parameters under the condition of high strain rate for TC17 titanium alloy were identified by introducing the response curve of the material at low strain rate as the constraint condition.The comparison of experimental and computational results shows that the identified parameters can accurately describe the dynamic response of TC17 titanium alloy under high strain rate and predict the distribution of residual stress field under laser shock.
【作者單位】： 空軍工程大學(xué)等離子體動力學(xué)重點實驗室;
【基金】：國家973計劃(2015CB057400) 國家自然科學(xué)基金(51505496,51305456)
【分類號】：V252.2;V261.8
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本文編號：1731946