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Storage life prediction under pre-strained thermally-accelerated aging of HTPB coating using the change of crosslinking density
Defence Technology ( IF 5.1 ) Pub Date : 2020-07-18 , DOI: 10.1016/j.dt.2020.07.008
Yong-qiang Du , Jian Zheng , Gui-bo Yu

In order to predict the storage life of a certain type of HTPB (hydroyl-terminated polybutadiene) coating at 25 °C and analyze the influence of pre-strain on the storage life, the accelerated aging tests of HTPB coating at 40 °C, 50 °C, 60 °C, 70 °C with the pre-strain of 0%, 3%, 6%, 9%, respectively were carried out. The variation regularity of the change of crosslinking density was analyzed and the aging model of HTPB coating under pre-strained thermally-accelerated aging was proposed. The storage life of HTPB coating at 25 °C was estimated by using the Berthelot equation as the end point of the aging life with a 30% decrease in maximum elongation. The results showed that the change of crosslinking density of HTPB coating increased with the increase of aging temperature and aging time, and decreased with the increase of pre-strain. Under 0% pre-strain, the relationship between the change of crosslinking density of HTPB coating and the aging time can be described by the logarithmic model with the confidence probability greater than 99%.The stress relaxation phenomenon existed under 3%, 6% and 9% pre-strained aging. The aging model considering chemical aging and pre-strain was established with the confidence probability greater than 90%. The storage life of HTPB coating was 15.2935 years at 25 °C under 0% pre-strain, which was reduced by 13.9007%, 75.6949% and 89.7859% under 3%, 6% and 9% pre-strain, respectively. The existence of pre-strain has a serious impact on the storage life of HTPB coating, therefore, the pre-strain should be avoided as much as possible during the actual storage.



中文翻译:

利用交联密度变化预测HTPB涂层预应变热加速老化下的储存寿命

为预测某类HTPB(羟基封端聚丁二烯)涂层在25℃下的贮存寿命,分析预应变对贮存寿命的影响,对HTPB涂层在40℃、50℃下的加速老化试验进行了试验。 ℃、60℃、70℃,预应变分别为 0%、3%、6%、9%。分析了交联密度变化的变化规律,提出了预应变热加速老化下HTPB涂层的老化模型。HTPB 涂层在 25 °C 下的储存寿命是通过使用 Berthelot 方程作为最大伸长率下降 30% 的老化寿命终点来估计的。结果表明,HTPB涂层交联密度的变化随着老化温度和老化时间的增加而增加,随着预应变的增加而减少。在0%预应变下,HTPB涂层交联密度的变化与老化时间的关系可以用对数模型来描述,置信概率大于99%。在3%、6%和6%以下存在应力松弛现象。 9% 预应变老化。建立了考虑化学老化和预应变的老化模型,置信概率大于90%。HTPB涂层在25℃、0%预应变下的储存寿命为15.2935年,在3%、6%和9%的预应变下分别降低了13.9007%、75.6949%和89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。HTPB涂层交联密度的变化与老化时间的关系可以用对数模型来描述,置信概率大于99%。在3%、6%和9%的预应变老化下存在应力松弛现象。建立了考虑化学老化和预应变的老化模型,置信概率大于90%。HTPB涂层在25℃、0%预应变下的储存寿命为15.2935年,在3%、6%和9%的预应变下分别降低了13.9007%、75.6949%和89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。HTPB涂层交联密度的变化与老化时间的关系可以用对数模型来描述,置信概率大于99%。在3%、6%和9%的预应变老化下存在应力松弛现象。建立了考虑化学老化和预应变的老化模型,置信概率大于90%。HTPB涂层在25℃、0%预应变下的储存寿命为15.2935年,在3%、6%和9%的预应变下分别降低了13.9007%、75.6949%和89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。在3%、6%和9%的预应变时效下存在应力松弛现象。建立了考虑化学老化和预应变的老化模型,置信概率大于90%。HTPB涂层在25℃、0%预应变下的储存寿命为15.2935年,在3%、6%和9%的预应变下分别降低了13.9007%、75.6949%和89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。在3%、6%和9%的预应变时效下存在应力松弛现象。建立了考虑化学老化和预应变的老化模型,置信概率大于90%。HTPB涂层在25℃、0%预应变下的储存寿命为15.2935年,在3%、6%和9%的预应变下分别降低了13.9007%、75.6949%和89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。在 3%、6% 和 9% 的预应变下分别降低了 13.9007%、75.6949% 和 89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。在 3%、6% 和 9% 的预应变下分别降低了 13.9007%、75.6949% 和 89.7859%。预应变的存在严重影响HTPB涂层的储存寿命,因此在实际储存过程中应尽量避免预应变。

更新日期:2020-07-18
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