2019年12月5日上午，應(yīng)彭華新教授邀請(qǐng)，英國(guó)皇家工程院院士、布里斯托復(fù)合材料研究所所長(zhǎng)Michael R. Wisnom教授來(lái)我院交流，并給我院師生帶來(lái)題為“Current challenges in predicting failure of advanced composites”的精彩報(bào)告。Michael R. Wisnom教授是纖維增強(qiáng)復(fù)合材料力學(xué)和失效領(lǐng)域的著名專家，長(zhǎng)期從事復(fù)合材料的失效分析、利用有限元分析理解和預(yù)測(cè)負(fù)載材料的行為和結(jié)構(gòu)方面的研究。
Michael R. Wisnom教授作相關(guān)報(bào)告
報(bào)告中，Wisnom教授首先對(duì)失效及其定義進(jìn)行介紹，指出復(fù)合材料的失效概念與其應(yīng)用目的密切相關(guān)。若考慮漏損，則應(yīng)考慮任何一個(gè)基體裂紋的問(wèn)題；若考慮極限承載能力，甚至可在允許接受的損壞程度內(nèi)提高強(qiáng)度，而不能單純使用測(cè)試報(bào)告中的數(shù)據(jù)。
Michael R. Wisnom教授作相關(guān)報(bào)告
隨后，Wisnom教授詳述了復(fù)合材料的壓縮試驗(yàn)和彎曲試驗(yàn)中的失效問(wèn)題。Wisnom教授講道，為避免傳統(tǒng)壓縮測(cè)試中，樣品因夾持而過(guò)早失效，應(yīng)采用替代測(cè)試方法以獲得可靠實(shí)驗(yàn)數(shù)據(jù)；在彎曲試驗(yàn)中，樣品尺寸效應(yīng)和應(yīng)變梯度對(duì)試驗(yàn)均有顯著影響，同時(shí)，控制失效時(shí)的離散分層和分裂、本征及后加工缺陷都非常重要；在混合玻璃/碳測(cè)試中，高模量和高強(qiáng)度碳纖維復(fù)合材料的混合會(huì)產(chǎn)生應(yīng)變梯度效應(yīng)問(wèn)題。最后，Wisnom教授總結(jié)了當(dāng)今復(fù)合材料失效測(cè)試所面臨的一系列挑戰(zhàn)。
Michael R. Wisnom教授作相關(guān)報(bào)告
Michael R. Wisnom教授與同學(xué)交流
彭華新教授為Michael R. Wisnom教授頒發(fā)紀(jì)念獎(jiǎng)牌
附報(bào)告人簡(jiǎn)介：
Michael Wisnom is Professor of Aerospace Structures at the University of Bristol. He is Director of Bristol Composites Institute (ACCIS), which builds on the work of the Advanced Composites Collaboration for Innovation and Science which he founded in 2007. He is a leading expert on the mechanics and failure of fibre reinforced composites, with over 400 published papers. He is a member of the steering board of the UK National Composites Centre, Editor in Chief and European Editor for Applied Science and Manufacturing of the international journal Composites Part A, and was Director of the Rolls-Royce Composites University Technology Centre from 2007-2017. He is a Fellow of the Royal Academy of Engineering, of the Institution of Mechanical Engineers and of the American Society for Composites. Professor Wisnom was the recipient of a Royal Society Wolfson Research Merit Award and is a past President of the International Committee on Composite Materials.
