Materials Engineering - Metals and alloys - Multiscale deformation modelling of small scale mechanical tests

材料工程-金属和合金-小规模机械测试的多尺度变形建模

• 批准号: 2276274
• 金额: --
• 依托单位: Swansea University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2276274
• 关键词: Materials; Engineering; Metals; alloys; Multiscale

One of the aims of the Prosperity Partnership project is to accurately evaluate the mechanical properties of a large number of steels from small scale tests. An important aspect of mechanical behaviour during steel making is anisotropic yield and work-hardening caused by rolling processes. Both hot and cold rolling result in metallurgical texture which effects mechanical properties and subsequent forming processes. This is a particular issue for thin sheet steels used for metal forming such as deep drawing grades.As the size of the deforming material becomes smaller, the influence of microstructure becomes greater and continuum modelling approaches become less accurate. Modelling deformation of the microstructure using crystal plasticity finite element modelling (CPFEM) allows predictions of anisotropic deformation and damage to be made.A continuum modelling approach is already being used in the Prosperity Partnership; however, combining CPFEM with continuum deformation models for small scale mechanical tests such as small punch and shear compression will allow a more accurate evaluation of micromechanical behaviour. These models can then be applied to larger scale deformation processes such as rolling using a multiscale approach which can then be applied to larger scale deformationThe primary aim of the project is to develop a CPFEM model for specific grades of steel. The model will be validated against small scale test data, using a multiscale approach based on representative volume elements (RVEs) with microstructural data such as grain and phase morphology. This approach will be used to predict damage in small scale tests as well as being used to evaluate the evolution of anisotropy during single and multi-stage deformation. The aim will be to ultimately apply the model to different sized rolling geometries, allowing predictions of the effects of scaling up the rolling processes. Initially the model will be applied to deformation at ambient temperature, with scope to extend to higher temperatures later. The multiscale approach will complement continuum models being developed as part of the Prosperity Partnership.

繁荣伙伴关系项目的目的之一是准确评估小型测试中大量钢的机械性能。钢制过程中机械行为的一个重要方面是滚动过程引起的各向异性产量和工作硬化。热滚动都会产生冶金纹理，从而影响机械性能和随后的形成过程。这是用于金属形成的薄板钢（例如深绘图等级）的特殊问题。随着变形材料的大小变小，微观结构的影响变得更大，并且连续建模方法变得越来越准确。使用晶体可塑性有限元建模（CPFEM）对微结构进行建模变形，可以预测各向异性变形和损害。繁荣合作伙伴关系已经使用了一种连续建模方法。但是，将CPFEM与连续变形模型相结合，用于小规模机械测试，例如小型打孔和剪切压缩，将可以更准确地评估微机械行为。然后可以将这些模型应用于更大的变形过程，例如使用多尺度方法滚动，然后将其应用于大规模变形，该项目的主要目的是为特定钢等级开发CPFEM模型。该模型将使用基于代表性体积元素（RVE）的多尺度方法来验证该模型，并具有微观结构数据，例如晶粒和相形态。该方法将用于预测小型测试中的损害，并用于评估单阶段和多阶段变形期间各向异性的演变。目的是最终将模型应用于不同大小的滚动几何形状，从而可以预测扩大滚动过程的影响。最初，该模型将应用于在环境温度下的变形，范围以后延伸至较高的温度。多尺度方法将补充作为繁荣伙伴关系的一部分开发的连续模型。