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| DOI | 10.1016/j.tecto.2021.228773 |
| Laponite gels - visco-elasto-plastic analogues for geological laboratory modelling | |
| Arachchige U.N.; Cruden A.R.; Weinberg R. | |
| 发表日期 | 2021 |
| ISSN | 00401951 |
| 卷号 | 805 |
| 英文摘要 | Laponite® is a synthetic clay that, depending on concentration, temperature and curing time, forms a clear, transparent thixotropic fluid or brittle visco-elasto-plastic gel when mixed with water. Here we present the results of rheological and mechanical testing of gel-forming Laponite RD (LRD) to evaluate its suitability as a rock analogue in laboratory analogue experiments. Rheological tests of 2–4 wt% concentrations of LRD in deionised water were carried out at temperatures between 20 and 50 °C, and after curing times of 3 to 14 days. Our results show that LRD gels change from a brittle, elastic-dominant, linear viscoelastic material to a plastic material as shear strain increases. The linear viscoelastic region occurs at shear strains, γ < 10% after which the material yields and then undergoes strain hardening before a peak stress occurs at γ = 15–20%. LRD then strain softens up to γ < 26.2%, beyond which it behaves as a plastic material. Empirical equations are provided that predict increases in the Young's and complex shear moduli of LRD with increasing concentration and ageing time. LRD can be used to model elastic deformation when γ < 10% at a shear strain rate of 0.1 s−1 and plastic deformation when γ > 26.2%. LRD is an ideal material for modelling the behaviour of rocks during the emplacement of magma and the propagation of brittle fractures in the upper crust. Its ease of preparation, low surface tension, full transparency, chemical and biological stability and photoelastic properties provide further advantages for analogue laboratory modelling compared to other frequently used visco-elastic gels, such as pig skin gelatine. © 2021 Elsevier B.V. |
| 关键词 | Analogue materialLaponite RDMagma emplacement and crack propagationRheologyVisco-elasto-plasticYield stress |
| 英文关键词 | Chemical stability; Curing; Deionized water; Elastoplasticity; Gels; Mammals; Mechanical testing; Shear strain; Strain hardening; Viscoelasticity; Chemical and biologicals; Complex shear modulus; Empirical equations; Laboratory modelling; Linear viscoelastic material; Linear viscoelastic regions; Plastic materials; Thixotropic fluids; Strain rate; analog model; concentration (composition); crack propagation; elastoplasticity; emplacement; laboratory method; magma; modeling; plastic deformation; rheology; strain rate; stress field; structural geology; viscoelasticity |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207936 |
| 作者单位 | School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, Clayton, VIC 3800, Australia |
| 推荐引用方式 GB/T 7714 | Arachchige U.N.,Cruden A.R.,Weinberg R.. Laponite gels - visco-elasto-plastic analogues for geological laboratory modelling[J],2021,805. |
| APA | Arachchige U.N.,Cruden A.R.,&Weinberg R..(2021).Laponite gels - visco-elasto-plastic analogues for geological laboratory modelling.Tectonophysics,805. |
| MLA | Arachchige U.N.,et al."Laponite gels - visco-elasto-plastic analogues for geological laboratory modelling".Tectonophysics 805(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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