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学历：博士研究生毕业
学位：工学博士学位
性别：男
学科：力学. 航空宇航科学与技术. 材料科学与工程. 机械工程. 冶金工程. 先进制造. 航空工程. 材料工程. 冶金工程. 机械工程. 固体力学
多尺度与微纳米力学，梯度结构材料，界面力学，固体本构关系，应变梯度理论，晶体塑性有限元，离散位错动力学，分子动力学，高熵合金，大数据与机器学习，材料基因，极端力学，高性能材料
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2023-02-08 合作论文“Thermo-mechanical deformation for thermo-induced shape memory polymers at equilibrium and non-equilibrium temperatures: Experiment and simulation”在Polymer发表
Highlights
•The effect of loading histories on the shape memory effect is indicated.
•A temperature hysteresis is observed in stress freezing and strain recovery stages.
•The influence of deformation history on glass transition temperature is discovered.
•A logarithmic rate-based viscoelastic-viscoplastic model for shape memory polymer is established.
•The temperature rate-, strain rate-, and deformation-dependent volume fraction of the rubbery phase is considered.
Abstract
Experimental investigations on the mechanical deformations of thermo-induced shape memory polymers (TSMPs) at equilibrium temperatures and shape memory effects at non-equilibrium temperatures are conducted at different strain rates. It is found that the loading history conditions change the glass transition temperature, which is the nature of the change of shape memory effect. Meanwhile, temperature hysteresis is observed in stress freezing and strain recovery stages due to the varied temperature rate. The effect of the loading histories on the shape memory effect is reflected by introducing the temperature rate, strain rate, and deformation-dependent delay factors into the rubbery phase volume fraction. Based on the phase transition theory, a logarithmic rate-based viscoelastic-viscoplastic model is established at finite deformation. In this model, the viscoelastic rubbery phase is parallel with the viscoplastic glassy phase. Then, a frozen phase is introduced into the parallel model by changing its frozen volume fraction to reflect the storage/release of the deformation. Finally, the proposed model is validated by comparing the simulated rate-dependent mechanical deformation at equilibrium temperatures and shape memory effect at non-equilibrium temperatures with corresponding experimental results.
Link
https://doi.org/10.1016/j.polymer.2023.125762