Environmental effects in biaxially orientated Polymethyl Methacrylate 机翻标题: 暂无翻译,请尝试点击翻译按钮。

会议集名/来源
22nd European Conference on Fracture: Loading and Environmental Effects on Structural Integrity: ECF 22, Belgrade, Serbia, 26-31 August 2018, Part 1 of 3
出版年
2019
页码
304-310
会议地点
Belgrade
作者单位
Department of Mechanical Engineering, Imperial Collge LondonDepartment of Mechanical Engineering, Imperial Collge LondonDepartment of Mechanical Engineering, Imperial Collge LondonDepartment of Mechanical Engineering, Imperial Collge London
作者
Sze Ki Ng;Muhammad A. Kamaludin;John P. Dear;Bamber R. Blackman
摘要
Environmental stress cracking (ESC) is commonly found in polymers when submerged in an environment under applied stress. In such conditions, a crack may initiate and propagate from a material defect until it reaches a critical size and causes catastrophic failure. It is known that materials with a denser molecular structure are less prone to ESC, hence amorphous polymers often suffer greatly from this effect. A fracture mechanics approach was employed to investigate the fracture mechanism and crack growth in both air and environment. Two different grades of PMMA (amorphous and biaxially stretched PMMA) were tested in solvents with similar solubility parameters as this is known to hasten crazing. Time for crack initiation and crack speed were obtained and plotted against their corresponding fracture toughness. Thus, the ESC resistance of each material can be compared and component life expectance can also be predicted. To validate the experimental results, scanning electron microscopy (SEM) was used to examine the fracture mechanism of ESC.
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关键词
Environmental stress cracking;Biaxially orientated PMMA;Fracture mechanics;Crazing
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