本文選題：DP鋼板 + 滯后回彈�。� 參考：《金屬學(xué)報(bào)》2015年11期

【摘要】：通過加載不同預(yù)應(yīng)變和保壓時間獲得了DP600鋼板的室溫滯后回彈響應(yīng).基于黏彈性理論,采用309 MPa恒應(yīng)力室溫蠕變實(shí)驗(yàn),獲得了預(yù)測滯后回彈過程的蠕變?nèi)崃亢瘮?shù).基于DP600鋼板室溫彈性和塑性加載響應(yīng),修正了線黏彈性本構(gòu)方程的積分下限,將柔量函數(shù)與修正的應(yīng)力率函數(shù)進(jìn)行卷積,獲得了影響滯后回彈過程的加載歷史效應(yīng).再將加載歷史應(yīng)變波形與卸載脈沖疊加,獲得不同預(yù)變形量的滯后回彈應(yīng)變預(yù)測值.結(jié)果表明,滯后回彈初期應(yīng)變率較高,之后應(yīng)變率逐漸降低;隨著預(yù)應(yīng)變的增加,滯后回彈應(yīng)變的絕對值逐漸遞增,并且滯后回彈占總回彈比例逐漸增加;滯后回彈預(yù)測方向與瞬時回彈方向相同,與加載方向相反;相同時間段內(nèi),蠕變回彈應(yīng)變比滯后回彈應(yīng)變明顯降低,與滯后回彈實(shí)驗(yàn)相比,蠕變恒應(yīng)力與蠕變回彈應(yīng)變的比值隨預(yù)應(yīng)變的變化規(guī)律呈現(xiàn)出良好的線性關(guān)系;基于黏彈性理論的修正模型所得到的預(yù)測值接近實(shí)驗(yàn)測量值,并能夠較好地反映實(shí)驗(yàn)變化規(guī)律.
[Abstract]:The hysteresis springback response of DP600 steel plate at room temperature was obtained by loading different prestrain and holding time. Based on the viscoelastic theory, the creep compliance function for predicting the delayed springback process is obtained by using 309 MPa constant stress room temperature creep experiment. Based on the room temperature elastic and plastic loading responses of DP600 plates, the integral lower bound of the linear viscoelastic constitutive equation is modified. The compliance function is convolution with the modified stress rate function, and the loading history effect affecting the delayed springback process is obtained. Then the loading history strain waveform and the unloading pulse are superimposed to obtain the prediction value of the lag springback strain with different predeformation quantities. The results show that the initial strain rate of lag springback is higher, then the strain rate decreases gradually, and with the increase of prestrain, the absolute value of hysteresis springback strain increases gradually, and the ratio of hysteresis springback to total springback increases gradually. The prediction direction of hysteresis springback is the same as the instantaneous springback direction, which is opposite to the loading direction, and the creep springback strain is obviously lower than the hysteresis springback strain in the same time period, compared with the hysteresis springback experiment. The ratio of creep constant stress to creep springback strain shows a good linear relationship with the change of prestrain, and the predicted value obtained by the modified model based on viscoelastic theory is close to the experimental measured value and can reflect the experimental variation law well.
【作者單位】： 北京理工大學(xué)材料學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目51175044~~
【分類號】：TG142.1

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