J-47胶粘剂随炉件拉伸剪切影响因素研究
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湖南航天环宇通信科技股份有限公司

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Influencing Factors on Tensile Shear of Coupon for J-47 Adhesive
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Hunan Aerospace Huanyu Communication Technology Co., Ltd

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    摘要:

    通过对航天产品中典型胶粘剂J-47的拉伸剪切试验,对比分析了底胶晾置时间、固化压力、胶膜吸潮、升温速率和制袋方式等因素对胶接强度的影响。结果表明,固含量35%~45%的底胶晾置时间对中温固化胶膜试片的拉伸剪切强度的影响非常小,不能很好的表征粘接面积较大蜂窝夹层结构件的粘接性能。随着固化压力的增加,试片的拉伸剪切强度呈现先增加后稳定再降低,当固化压力在0.15~0.3 MPa时,拉伸剪切强度达到最大值。试片的拉伸剪切强度随湿气进入胶层时间的增加而降低,最后趋于稳定值,当含水量达到1.47%时,拉伸剪切强度最低,与初始状态降低20.78%。选择合适辅料,升温速率控制在0.5~3 ℃/min范围内,均可得到较高的拉伸剪切强度。

    Abstract:

    Through the tensile shear test of J-47, a typical adhesive in aerospace products, the effects of primer drying time, curing pressure, moisture absorption of the adhesive film, temperature increase rate and bag making method on the bonding strength were comparatively analysed. The results showed that the drying time of the primer with 35%-45% solid content had very little effect on the tensile shear strength of the medium-temperature cured adhesive film specimens, which could not well characterise the bonding of honeycomb sandwich structural parts with large bonding areas. With the increase of curing pressure, the tensile shear strength of the specimens showed an increase, then stability and then decrease, and reached the maximum value when the curing pressure was 0.15~0.3 MPa. The tensile shear strength of the specimen decreased with the increase of the time of moisture entering into the adhesive layer, and finally tended to a stable value, and when the water content reached 1.47%, the tensile shear strength was the lowest, which was 20.78% lower than the initial state. Higher tensile shear strength can be obtained by choosing suitable excipients and controlling the temperature increase rate in the range of 0.5~3 ℃/min.

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  • 收稿日期:2023-10-22
  • 最后修改日期:2024-04-09
  • 录用日期:2024-04-22
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