Summit on Predictive Modeling of Ductile Failure; Austin, Texas; March 2-3, 2015

结构材料韧性断裂的建模一直是工程界长期关注的问题。通过裂缝扩展对结构和结构部件的耐久性、可靠性和失效进行评估，关键依赖于通过此类建模为这些工程问题提供预测解决方案的能力。峰会的目标是汇集结构失效预测建模领域的研究人员，以评估最先进的预测建模工具的能力。讨论将集中于盲目预测失败的能力；研究结果将通过一篇开放获取的同行评议期刊文章向社区传播。本次研讨会的影响在于，对于延性失效建模中仍然存在的开放性问题，产生了基于群体的共识，这可以作为指导未来失效建模投资的基础。目前，结构材料的延性破坏通过许多不同的方法进行建模，在微观响应模型中纳入了变形和破坏过程的各个方面。本次首脑会议的讨论将集中于在事先不了解失效模式的情况下对反应作出的盲目预测。桑迪亚国家实验室提出的挑战问题为评估社区提供此类解决方案的能力提供了一个工具。在本次挑战赛中，14个团队对复杂几何部件的响应和失效进行了预测，该部件由一种重要的工程合金Ti6Al4V制成，具有复杂的本构行为；这些预测将与来自三个独立实验室的实验室实验进行比较。讨论将集中在不同模型在预测韧性破坏方面的能力，更重要的是确定我们建模能力的差距，并为该领域的未来研究提供方向/挑战。参与对提供盲预测的研究人员和感兴趣的研究人员作为观察者开放。

Modeling of ductile fracture in structural materials has been a problem of longstanding interest in engineering. The assessment of the durability, reliability and failure of structures and structural components through crack growth relies critically on the ability to offer predictive solutions to these engineering problems through such modeling. The goal of the Summit is to bring together researchers in the area of predictive modeling of structural failure to assess the capabilities of state-of-the-art predictive modeling tools. Discussions will focus on the ability to generate blind predictions of failure; the results will be disseminated to the community through an open-access peer-reviewed journal article. The impact of this workshop lies in the generation of a group-based consensus on the open issues that remain in ductile failure modeling that can be used as a basis to guide future investments in failure modeling.Currently, ductile failure in structural materials is modeled through many different methods, incorporating various aspects of deformation and failure processes in models of the microscale response. The discussions at this Summit will be focused around blind predictions of response, made without prior knowledge of failure modes. The Challenge problem posed by the Sandia National Laboratories provides a vehicle for assessing the capabilities of the community to provide such solutions. In this Challenge, fourteen teams made predictions of the response and failure in a complex geometrical part, made of an important engineering alloy - Ti6Al4V - exhibiting complex constitutive behavior; these predictions will be compared to laboratory experiments from three independent laboratories. The discussions will focus on the capabilities of the different models in predicting ductile failure, and more importantly identify gaps in our modeling capability and provide directions/challenges for future research in this area. Participation is open to researchers who provided blind predictions and to interested researchers to participate as observers.