Degradation of single lap adhesively bonded composite joints due to hot water ageing
Degradation of single lap adhesively bonded composite joints due to hot water ageing
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DOI：
10.1080/00218464.2015.1076340
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发表时间：
2017-04
期刊：
影响因子：
--
通讯作者：
I. F. Soykok
中科院分区：
文献类型：
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作者：
I. F. Soykok
摘要接头是纤维增强环氧塑料结构中最关键的部位，它会受到连续的水热作用。为了评估其长期性能，对具有[0/90/45/−45]s纤维取向的玻璃纤维增强环氧塑料的粘接接头进行了加速老化处理。在三种不同的水温（50°C、70°C和90°C）下，研究了一周和两周浸泡时间内由于湿热暴露引起的单搭接剪切样品静态拉伸性能的变化。老化温度和浸泡时间被认为是影响的载荷-位移特性，最大失效载荷，和明显的失效模式与Loctite Hysol-9466环氧树脂型粘合剂结合的接头。由于水热暴露，最大失效载荷，距离失效值，和刚度的关节下降了一定的量的浸泡时间和温度成比例。虽然未老化的样品以及在50°C和70°C下老化的样品主要表现出轻微的纤维撕裂（LFT）失效，但在90°C下处理的样品以断料（SB）失效模式通过材料横截面破裂。
ABSTRACT Joints, which are the most critical part of fibre-reinforced epoxy plastic structures, can be exposed to continuous hydrothermal action. In order to estimate their long-term performance, an accelerated ageing process was performed on adhesively bonded joints of glass-fibre-reinforced epoxy plastics with [0/90/45/−45]s fibre orientations. Changes in the static tensile properties of single lap shear samples due to hot-wet exposure were investigated for one- and two-week immersion periods and at three different water temperatures (50°C, 70°C, and 90°C). Both the ageing temperature and immersion time were found to be influential on load–displacement characteristics, maximum failure loads, and apparent failure modes of joints bonded with Loctite Hysol-9466 epoxy type adhesive. Due to the hydrothermal exposure, maximum failure loads, distance to failure values, and stiffness of joints decreased by a certain amount in proportion to the immersion time and temperature. While unaged samples and those aged at 50°C and 70°C exhibited mainly light fibre-tear (LFT) failures, the samples treated at 90°C ruptured through the material cross section in stock-break (SB) failure mode.