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摘要:银纹是玻璃态高分子材料所特有的一种现象, 它既是高分子材料的塑性变形和增韧机理, 又是高分子材料的损伤机理, 还是连接高分子材料微观损伤与宏观破坏的桥梁. 银纹的萌生、长大与断裂是高分子科学和固体力学所共同关注的难题. 过去几十年在试验、理论和数值模诸方面也取得了显著进展, 但较为系统的理论框架尚未建立, 人们试图把细观力学的基本知识与高分子系统银纹化现象联系起来的设想才刚刚开始,且尚未在指导高分子合金设计方面起到关键作用. 本文试图对近10多年来, 高分子银纹化的研究进展予以介绍和评述. 首先简要介绍银纹的基本形貌、萌生判据与生长规律, 然后分别介绍银纹断裂力学、银纹损伤力学和银纹细观力学的研究进展和成果, 最后概要介绍银纹分子动力学研究的最新进展.Abstract:Crazing is a special phenomenon in glassy polymers. It concerns not only themechanism of plastic deformation and toughness, but also the damagemechanism of polymers, which is a bridge to link the micromechanism ofdamage and macroscopic failure of polymers. The initiation, growth andbreakdown of craze are open problems for scientists of materials scienceand solid mechanics. Although extensive researches have be devoted to thistopic and considerable advances in the experimental, theoretical andnumerical investigations have been made in the past decades, there isstill no systematic theoretical framework to describe the crazing ofpolymers, and people have just started to link the fundamental knowledge ofmicromechanics to the phenomenon of crazing of polymers,and this kind of studies have not yet played a key role in guiding the blend design. Inthis paper, we introduce the advances in polymer crazing in thepast decade. A brief introduction to the structure, the initiation criterion, thegrowth and the breakdown of crazing is presented first. Emphasis of thepaper is on the recent advances of the applications offracture mechanics, damage mechanics, micromechanics and moleculardynamics in the studies on the crazing of glassy polymers.
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