Visit to NASA Langley Research Center - participation in the second World Wide Failure Exercise

参观NASA兰利研究中心——参加第二届全球失效演习

• 批准号: EP/F020872/1
• 负责人: Silvestre Pinho
• 金额: $ 0.97万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF020872%2F1
• 关键词: Visit; NASA; Langley; Research; Center

The work to be carried out during this visit will result in a complete set of predictions for the several test cases of the second World Wide Failure Exercise (WWFE II)*. The different test cases of the exercise have different levels of difficulty, will involve different areas of our failure theories, and might require different implementations of it. For this reasons, the readiness level of any preliminary predictions by July (before the visit) will vary substantially from test case to test case. The visit will start by organising the preliminary predictions according to readiness level. Starting from the test cases for which the predictions are understood to be closer to be finalised (higher readiness level), each prediction will be reviewed in detail, and the final predictions will be defined. It is likely that the test cases with lowest readiness level will correspond to no preliminary predictions available at the start of the visit. For these cases, a much greater amount of effort and time will be required before a final prediction is defined and agreed. Finally, tables and graphs will be generated in the format required by the organisers of the WWFE II, as well as the corresponding research paper with the theory employed and its application to the test cases of the WWFE II.During the visit, and in parallel with the work on the WWFE II, there will be discussions on strengthening future collaborations between Imperial College London and NASA. The two routes which will be exploited are (i) funding sources for joint research projects, and (ii) including NASA researchers as consultants/ collaborators in British and European grants. Regarding the latter, it is already being considered in a grant to be submitted to EPSRC in the near future.*The WWFE II is a benchmarking exercise aimed at establishing the current knowledge and predictive capability in failure of composites reinforced with UD plies under a generic three-dimensional (3D) state of stress. Only selected proposers of recognised failure theories were invited to participate in the exercise, and amongst them is our team, comprising Imperial College London, NASA and the University of Porto. This selection is an important recognition of the failure theories published by our group. Following with the tradition of the first exercise (WWFE I), this second exercise will give a high visibility to the failure theories of the participants, and advance the knowledge on failure of composites. The exercise comprises two parts: in a first part, the participants are asked to carry out blind predictions for failure envelopes involving a 3D stress state, and publish their results; in the second part, the participants are given the experimental results, and are asked to comment on the correlation of their predictions with the experimental results, and propose any amendments to their theories if appropriate. The deadline for the first part is end of November 2007, and our team is already working on generating failure envelopes for some of the test cases.

这次访问期间将要开展的工作将为第二次世界核事故演习(WWFE II)*的几个测试案例产生一套完整的预测。该练习的不同测试用例具有不同的难度级别，将涉及我们失败理论的不同领域，并且可能需要不同的实现。因此，到7月(访问之前)的任何初步预测的准备程度将因测试用例而有很大不同。访问将从根据准备程度组织初步预测开始。从被理解为预测更接近最终确定的测试用例(更高的准备级别)开始，将详细审查每个预测，并定义最终预测。准备程度最低的测试用例很可能对应于访问开始时没有可用的初步预测。对于这些情况，在定义和商定最终预测之前，将需要更多的努力和时间。最后，将按照第二届WWFE组织者要求的格式生成表格和图表，以及相应的研究论文，其中包括所采用的理论及其在第二次WWFE测试案例中的应用。在访问期间，在第二次WWFE工作的同时，将讨论加强伦敦帝国理工学院和美国国家航空航天局之间未来的合作。将利用的两条途径是(I)联合研究项目的资金来源，以及(Ii)将NASA研究人员作为顾问/合作者纳入英国和欧洲的赠款。关于后者，它已经在一项将在不久的将来提交给EPSRC的赠款中得到考虑。*WWFE II是一项基准测试，旨在建立在通用三维(3D)应力状态下用UD层增强的复合材料的现有知识和失效预测能力。只有公认的失败理论的选定提倡者被邀请参加这次演习，其中包括我们的团队，由伦敦帝国理工学院、美国宇航局和波尔图大学组成。此次入选是对本课题组发表的失败理论的重要认可。遵循第一次练习(WWFE I)的传统，第二次练习将使参与者的失效理论具有高度的可见性，并增进对复合材料失效的认识。该练习包括两个部分：在第一部分，参与者被要求对涉及3D应力状态的失败包络进行盲预测，并公布他们的结果；在第二部分，参与者被给予实验结果，并被要求评论他们的预测与实验结果的相关性，并在适当的情况下提出对他们的理论的任何修改。第一部分的截止日期是2007年11月底，我们的团队已经在为一些测试用例生成失败包络。

项目成果

Computational implementation of a novel constitutive model for multidirectional composites

新型多向复合材料本构模型的计算实现

• DOI: 10.1016/j.commatsci.2011.07.038
• 发表时间: 2012
• 期刊: Computational Materials Science
• 影响因子: 3.3
• 作者: Vyas G

Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach

• DOI: 10.1016/j.compscitech.2011.03.009
• 发表时间: 2011-05-31
• 期刊: COMPOSITES SCIENCE AND TECHNOLOGY
• 影响因子: 9.1
• 作者: Vyas, G. M.;Pinho, S. T.;Robinson, P.
• 通讯作者: Robinson, P.

A PRESSURE-DEPENDENT CONSTITUTIVE MODEL WITH FAILURE FOR LAMINATED COMPOSITES

层压复合材料失效的压力相关本构模型

• 发表时间: 2008
• 作者: S Pinho

On the prediction of failure in laminated composites (invited lecture)

层合复合材料失效预测（特邀报告）

• 发表时间: 2008
• 作者: S Pinho

Material and structural response of polymer-matrix fibre-reinforced composites: Part B

• DOI: 10.1177/0021998313476523
• 发表时间: 2013-03-01
• 期刊: JOURNAL OF COMPOSITE MATERIALS
• 影响因子: 2.9
• 作者: Pinho, S. T.;Vyas, G. M.;Robinson, P.
• 通讯作者: Robinson, P.