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结构胶黏剂在温度作用下的剪切性能试验研究
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Experimental Study on Shear Performances of Structural Adhesives at Different Temperatures
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    摘要:

    设计并进行了2组采用不同条件固化的胶黏剂的拉伸剪切试验,研究了结构胶黏剂的剪切强度和剪切刚度随温度升高的变化规律,以及不同温度下胶黏剂剪切破坏模式.试验发现,室温固化的胶黏剂再次经历高温后,其玻璃化温度Tg有了30 ℃左右的提高;随着温度的升高,胶黏剂剪切强度和剪切刚度总体上呈下降趋势,且在其玻璃化温度Tg前后20 ℃的区域内变化最为明显.研究表明,胶黏剂玻璃化温度是影响胶黏剂温度作用下剪切性能的关键因素,同时高温固化方式可以提高胶黏剂玻璃化温度,延缓胶黏剂剪切强度和剪切刚度的下降.在此基础上,引入玻璃化温度这一重要参数,给出了结构胶黏剂的剪切强度及剪切刚度与温度之间的关系模型,为实际工程应用提供了参考.

    Abstract:

    The structural performances including shear-strength, stiffness, and failure mode of structural adhesives with two different curing schedules at room and high temperatures were investigated. The test results showed that the high temperature curing on the structural adhesive after room temperature curing can improve the value of glass transition temperature Tg by about 30 ℃. Moreover, the shear performances of the structural adhesives were deteriorated with the increase of the temperature, and the maximum degradation rate occurred within the temperature range of Tg±20 ℃. It is indicated that the glass transition temperature Tg was critical to the shear behavior of the structural adhesive at the high temperature. In a whole, the high temperature curing can improve the value of glass transition temperature, and it is helpful to delay the degradation of shear performance at the elevated temperature. Based on the test results, the normalized relationship between the shear performances and temperature were eventually proposed, in which glass transition temperature was considered.

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胡克旭,董 坤,杨耀武.结构胶黏剂在温度作用下的剪切性能试验研究[J].湖南大学学报:自然科学版,2016,43(7):120~125

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  • 在线发布日期: 2016-08-11
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