班慧勇, 白日升, 刘明, 李文斌, 白音. 钛-钢复合钢材力学性能及本构模型研究[J]. 工程力学, 2019, 36(7): 57-66. DOI: 10.6052/j.issn.1000-4750.2018.06.0343
引用本文: 班慧勇, 白日升, 刘明, 李文斌, 白音. 钛-钢复合钢材力学性能及本构模型研究[J]. 工程力学, 2019, 36(7): 57-66. DOI: 10.6052/j.issn.1000-4750.2018.06.0343
BAN Hui-yong, BAI Ri-sheng, LIU Ming, LI Wen-bin, BAI Yin. Study on the material properties and constitutive model of titanium-clad steel[J]. Engineering Mechanics, 2019, 36(7): 57-66. DOI: 10.6052/j.issn.1000-4750.2018.06.0343
Citation: BAN Hui-yong, BAI Ri-sheng, LIU Ming, LI Wen-bin, BAI Yin. Study on the material properties and constitutive model of titanium-clad steel[J]. Engineering Mechanics, 2019, 36(7): 57-66. DOI: 10.6052/j.issn.1000-4750.2018.06.0343

钛-钢复合钢材力学性能及本构模型研究

Study on the material properties and constitutive model of titanium-clad steel

  • 摘要: 为系统研究钛-钢复合钢材的力学性能,对2 mm~12 mm厚TA2+Q235B钛-钢复合钢材进行了系列试验研究,包括拉伸、剪切、粘结、弯曲、冲击韧性、硬度等试验,其中拉伸试件设计考虑了复合比的影响。基于试验结果,得到了该类钛-钢复合钢材的基本力学性能指标,并重点对其单调拉伸荷载下的力学性能进行了分析研究。试验结果表明:钛-钢复合钢材的应力-应变曲线特征及典型力学性能指标与复合比的大小直接相关;随着复合比的增大,屈服平台逐渐消失,弹性模量逐渐减小,屈服强度和断后伸长率逐渐升高,但抗拉强度的变化并不明显,这与钛TA2和Q235B低碳钢本身的力学性能有关。基于拉伸试验数据和有限元数值计算结果,提出了钛-钢复合钢材的力学指标计算方法,建立了其本构模型。此外,剪切和粘结试验得到的复合界面强度尽管较低,但对拉伸力学性能影响十分有限;同时,该类复合钢材的受弯和冲击性能良好,硬度结果呈现两侧高、中间界面层低的情况。研究结果可为钛-钢复合钢材在结构工程领域的研究和应用提供基础参考和材料本构模型,并有利于促进其工程应用。

     

    Abstract: To study the mechanical properties of titanium-clad (TC) steel systematically, a series of tests on TA2+Q235B (2 mm~12 mm thick) TC steel plates are carried out including tension coupon test with various clad ratios, shear test, combine test, bending test, impact test and hardness test. Based on the test results, basic mechanical properties of this kind of TC steel are obtained. In particular, the mechanical properties under monotonic tensile loading are focused on. It is indicated that the characteristics of the stress-strain curves and typical mechanical properties of the titanium-clad steel are directly related to the clad ratio. With an increase of the clad ratio, the yield plateau disappears gradually and the elastic modulus decreases, whilst the yield strength and the elongation increase although the change in tensile strength is insignificant. These phenomena are related to the mechanical properties of titanium (TA2) and low carbon steel (Q235B). Based on the tensile test data and finite element analysis results, a calculation method for determining the mechanical index of the TC steel is developed, and a constitutive model of the TC steel is proposed in this paper. In addition, despite the fact that the strengths obtained from the shear and combine tests were low, their effects on the tensile properties are rather limited. The bending performance and impact properties of the TC steel are good; the hardness of the base layer and cladding layer are higher than that at the bonding interface region. This work may provide basic reference and the material constitutive model for research of the TC steel in structural engineering, and may promote its engineering applications.

     

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