The degradation process of adhesive bonding layers on ship exposure decks was examined via an exposure test using adhesive bonding joint specimens under tensile shear load. The degradation was evaluated by the delamination and the deformation of the adhesive layer. The degradation initiated in summer, which was more significant for the specimens located at exposed areas of the ship than those in the engine room (i.e. not exposed area). Environmental measurements revealed that, in summer, the daily highest surface temperature was greatly raised at the exposed areas that, however, exhibited equal or lower average values compared to the engine room. The degradation of an adhesive bonding joint would initiate relatively rapidly in a high-temperature environment. This indicates the highest temperature is a more important factor for adhesive bonding durability than the average temperature. The tensile test conducted after the exposure test showed that the degradation progressed from the adhesive layer edge. The surface temperature on an ocean-going ship was also measured to examine the temperature condition, revealing more severe values than those on ships in mid-latitude regions such as Japan. The design temperature for adhesive bonding joints should be estimated as at least 70 °C for exposed areas.

中文翻译：

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船舶外露甲板结构粘接接头的退化

通过使用粘合剂粘合接头试样在拉伸剪切载荷下的暴露试验，检查了船舶暴露甲板上粘合剂粘合层的降解过程。劣化通过粘合剂层的分层和变形来评价。降解开始于夏季，对于位于船舶暴露区域的试样比位于机舱（即非暴露区域）的试样更显着。环境测量显示，在夏季，暴露区域的每日最高表面温度大大升高，但与机舱相比，其平均值相等或更低。在高温环境中，粘合剂接合接头的退化会相对迅速地开始。这表明最高温度是比平均温度更重要的粘合剂粘合耐久性因素。暴露试验后进行的拉伸试验表明，劣化从粘合剂层边缘开始。还测量了远洋船舶的表面温度以检查温度状况，显示出比日本等中纬度地区船舶更严重的值。对于暴露区域，粘合剂粘合接头的设计温度应估计为至少 70 °C。显示比日本等中纬度地区的船舶上的值更严重的值。对于暴露区域，粘合剂粘合接头的设计温度应估计为至少 70 °C。显示比日本等中纬度地区的船舶上的值更严重的值。对于暴露区域，粘合剂粘合接头的设计温度应估计为至少 70 °C。