Post necking material testing, characterization and constitutive modelling

颈缩后材料测试、表征和本构建模

• 批准号: 515467-2017
• 负责人: Czekanski, Aleksander
• 金额: $ 1.46万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=648477
• 关键词: Post; necking; material; testing; characterization

The National Highway Traffic Safety Administration, Department of Transportation (Federal Motor Vehicle**Safety Standards, FMVSS 206) requires that certain safety considerations and requirements are met in the**design of vehicle components including doors and door locks during rear and side impact. Some of the main**design considerations to protect vehicle occupants are to minimize the impacted force by means of energy**absorption and/or energy diversion. This includes collapsing structural members and foam filled structures, and**snapping safety locks, among others.**The objective of the proposed study is to understand the underlying mechanics of metallic materials under**failure specifically post-necking regime. This includes studying the effect of material microstructure, strength,**hardening and heat treatment on the onset of necking for which available data is limited in the literature and**industry. This will be achieved through developing an integrated test plan, material characterization and**modeling techniques to predict such phenomena. Due to the unique localized non-uniform deformation in the**necking regions, advanced strain measurements using digital imaging will be used. The test results will then be**used to develop constitutive plastic models able to capture the necking behavior. This will be achieved using**two numerical models. The first is an iterative plastic model with updated hardening coefficients and the**second using a porous plastic model with void nucleation.**The proposed study will serve as a backbone of the engineering design and aid in the development, selection**and optimization of more reliable materials and designs, benefiting a wide range of applications. This tool**would, therefore, be an added value to the body of knowledge and offer an effective tool towards innovative**engineering to the Canadian industry.

美国国家公路交通安全管理局，运输部（联邦机动车 ** 安全标准，FMVSS 206）要求在车辆部件（包括车门和门锁）的 ** 设计中，在后部和侧面碰撞期间满足某些安全考虑和要求。保护车辆乘员的一些主要设计考虑因素是通过能量吸收和/或能量转移来最小化冲击力。这包括倒塌的结构构件和泡沫填充结构，以及 ** 折断安全锁等。提出的研究的目的是了解下的金属材料的基本机制 ** 失败，特别是后颈缩制度。这包括研究材料微观结构、强度、硬化和热处理对颈缩发生的影响，文献和 ** 行业中的可用数据有限。这将通过制定综合测试计划、材料表征和 ** 建模技术来实现，以预测此类现象。由于颈缩区域中独特的局部不均匀变形，将使用使用数字成像的先进应变测量。试验结果将用于开发能够捕捉颈缩行为的本构塑性模型。这将使用 ** 两个数值模型来实现。第一种是具有更新硬化系数的迭代塑性模型，** 第二种使用具有空穴成核的多孔塑性模型。**拟议的研究将作为工程设计的支柱，并有助于开发，选择 ** 和优化更可靠的材料和设计，使广泛的应用受益。因此，这一工具 ** 将是知识体系的一个附加值，并为加拿大工业的创新 ** 工程提供一个有效的工具。