Experimental Research on Hysteretic Constitutive Relationship of Titanium-Steel Clad Plates Under Cyclic Loading
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摘要: 为探究TA2/Q235钛钢复合板在循环荷载下的滞回本构关系,对不同加载制度下的28个钛钢复合板试件开展试验研究,得到了钛钢复合板的单调性能、滞回性能以及断口形貌:在循环荷载作用下钛钢复合板的滞回曲线饱满,无明显捏拢现象,且呈现出各向同性强化与随动强化的混合特征;试件断口为微孔聚集型断裂,属于延性断裂。基于此,采用Ramberg-Osgood表达式拟合钛钢复合板的循环骨架曲线,利用Chaboche塑性本构模型描述试件的滞回性能,根据试验结果标定骨架曲线模型和滞回本构模型中的材料参数,并结合标定的滞回本构模型分析了钛层与钢材复合比的影响。结果表明:随着复合比的下降,钛钢复合板各向同性强化更为显著,而随动强化特性无明显变化。最后,采用ABAQUS有限元软件对循环荷载试验过程进行数值模拟,模拟结果与试验滞回曲线吻合良好,表明所标定的参数可以准确预测钛钢复合板在循环荷载作用下的响应。Abstract: In order to explore the hysteretic constitutive relationship of TA2/Q235 titanium-steel clad plates under cyclic loading, a total of 28 titanium-steel clad plate specimens under various loading protocols were tested. The monotonic behavior, hysteretic behavior, and fracture morphology of the specimens were obtained. The hysteretic curves of the specimens subjected to cyclic loading were plump without obvious pinching effects, demonstrating a mixed hardening characteristic combining isotropic hardening and kinematic hardening. Microvoid coalescence fracture, a typical mode of ductile fracture, was observed from the fracture morphology. The skeleton curves of titanium-steel clad plates were fitted using the Ramberg-Osgood equation, while the Chaboche plastic constitutive model was used to characterize the hysteretic behavior of the specimens. Based on the experimental results, the material parameters for both the skeleton curve model and hysteretic constitutive model were calibrated. The effects of the cladding ratio were examined using the calibrated hysteretic constitutive model. The results showed that the isotropic hardening effect of the titanium-steel clad plates became more significant with a decreasing cladding ratio, while the kinematic hardening characteristic remained unchanged. Using the ABAQUS finite element software, a numerical simulation of the cyclic loading test process was conducted. The simulation results agreed well with the experimental hysteresis curves, indicating that the calibrated parameters accurately predicted the response of titanium-steel clad plates under cyclic loading.
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Key words:
- titanium-steel clad plate /
- cyclic loading /
- hysteretic behavior /
- constitutive model /
- cladding ratio
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