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Development of computational design tools for characterising and modelling cutting in ultra soft solids
Extreme Mechanics Letters ( IF 4.7 ) Pub Date : 2020-09-11 , DOI: 10.1016/j.eml.2020.100964
C.G. Skamniotis , M.N. Charalambides

Computational modelling of the in vivo mechanical response of various biological materials within the human organism, such as brain tissue, bone, arteries, ingested food, is an increasingly cost-effective design tool for bio-medical, bio-engineering and surgical applications. This study addresses the knowledge gap in simulating deformation-fracture during cutting in continua that lie in the transition between a soft solid and a complex fluid state. Hydrated food is one such system produced naturally after swallowing. We show that a viscoplastic-damage constitutive law calibrated through compression tests on hydrated biscuit particles, can be utilised in Eulerian Finite Element (FE) analysis to predict complex localised deformation-fracture material behaviour during cutting at two length scales with high fidelity. We demonstrate that in such materials a fracture term is not always necessary to predict ultimate separation and that the Eulerian FE analysis is a versatile approach based on which largely different material cutting behaviours can be modelled. Our study provides a platform for understanding and optimising processes involving ultra-soft materials which flow excessively and exhibit weak or strong cutting resistance.



中文翻译:

开发用于表征和建模超软固体切削的计算设计工具

体内计算模型人类有机体内各种生物材料(例如脑组织,骨骼,动脉,摄入的食物)的机械响应是一种越来越具有成本效益的设计工具,适用于生物医学,生物工程和外科应用。本研究解决了在连续过程中模拟在软固体和复杂流体状态之间过渡时的变形-断裂过程中的知识空白。水合食物是吞咽后自然产生的一种这样的系统。我们显示,通过对水合饼干颗粒进行压缩测试校准的粘塑性损伤本构关系,可以用于欧拉有限元(FE)分析中,以高保真度在两个长度范围内的切削过程中预测复杂的局部变形-断裂材料行为。我们证明,在这种材料中,断裂项不一定总是可以用来预测最终的分离,而欧拉有限元分析是一种通用的方法,基于该方法可以对不同材料的切削行为进行建模。我们的研究为理解和优化涉及超软材料的工艺提供了平台,超软材料流动过多并且显示出较弱或较强的切削阻力。

更新日期:2020-09-11
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