为了探究柱形装药爆炸应力波在混凝土介质中的传播规律,基于Karagozian and Case concrete(KCC)本构模型和多物质ALE算法(multi-material ALE,MMALE)开展数值模拟研究。首先,通过与已有的试验数据进行对比,验证了本构模型参数和数值算...为了探究柱形装药爆炸应力波在混凝土介质中的传播规律,基于Karagozian and Case concrete(KCC)本构模型和多物质ALE算法(multi-material ALE,MMALE)开展数值模拟研究。首先,通过与已有的试验数据进行对比,验证了本构模型参数和数值算法的适用性;在此基础上以峰值应力为准则,对装药周围混凝土介质的爆炸破坏分区进行划分,并讨论了各破坏分区中爆炸应力波的衰减规律;之后,分析了装药长径比对爆炸破坏分区和爆炸应力波传播规律的影响;最后,进一步考虑装药埋深的影响,并建立柱形装药爆炸应力波峰值应力计算公式。研究结果表明:各爆炸破坏分区中爆炸应力波衰减规律存在显著差异,与中远区(过渡区和破裂区)相比,装药近区(拟流体区和压碎区)衰减更快,另外,柱形装药长径比增加会加快法向峰值应力的衰减;并且建立的爆炸应力波峰值应力计算公式可以较为准确快速地计算出不同形状、不同埋深下柱形装药爆炸应力波的法向峰值应力。展开更多
Accurately forecasting the triple point(TP)path is essential for analyzing blast loads and assessing the destructive effectiveness of the height of burst explosion.Empirical models that describe the TP path under norm...Accurately forecasting the triple point(TP)path is essential for analyzing blast loads and assessing the destructive effectiveness of the height of burst explosion.Empirical models that describe the TP path under normal temperature and pressure environments are commonly employed;however,in certain configurations,such as at high-altitudes(HAs),the environment may involve low temperature and pressure conditions.The present study develops a theoretical prediction model for the TP path under reduced pressure and temperature conditions,utilizing the image bursts method,reflected polar analysis,and dimensional analysis.The model's accuracy is evaluated through numerical simulations and experimental data.Results indicate that the prediction model effectively evaluates the TP path under diminished temperature and pressure conditions,with most predictions falling within a±15%deviation.It was found that the TP height increases with altitude.As the altitude rises from 0 m to 10,000 m,the average TP height increases by 61.7%,87.9%,109.0%,and 134.3%for the scaled height of burst of 1.5 m,2.0 m,2.5 m,and 3.0 m,respectively.Moreover,the variation in TP height under HA environments closely mirrors that observed under corresponding reduced pressure conditions.In HA environments,only the effect of low-pressure conditions on the TP path needs to be considered,as the environmental lowtemperature has a minimal effect.展开更多
文摘为了指导爆容弹优化设计和日常维护,开展了炸药爆炸作用下20 L爆容弹响应特性研究,设计了不同质量三硝基甲苯(trinitrotoluene,TNT)爆容弹内爆炸试验,测量了爆容弹外壁面应变分布和变化规律,获得了爆容弹内部爆炸冲击超压;根据试验结果,校准了等比例仿真计算模型,利用AUTODYN程序计算了100 g TNT炸药爆炸后爆容弹内部冲击波传播规律,获得了爆炸场压力分布。结果表明,爆容弹内部压力仿真计算结果和试验结果基本相符;炸药爆炸作用下,爆容弹内部压力呈现出多峰叠加且压力基线上浮的复杂结构,最大压力出现在爆容弹拐角位置处,爆容弹外璧最大应变出现在爆心平面偏下的位置,应变最大振幅出现在起爆后10 s,显示出了结构响应相对于爆炸冲击作业的滞后效应和延迟效应。
文摘为了探究柱形装药爆炸应力波在混凝土介质中的传播规律,基于Karagozian and Case concrete(KCC)本构模型和多物质ALE算法(multi-material ALE,MMALE)开展数值模拟研究。首先,通过与已有的试验数据进行对比,验证了本构模型参数和数值算法的适用性;在此基础上以峰值应力为准则,对装药周围混凝土介质的爆炸破坏分区进行划分,并讨论了各破坏分区中爆炸应力波的衰减规律;之后,分析了装药长径比对爆炸破坏分区和爆炸应力波传播规律的影响;最后,进一步考虑装药埋深的影响,并建立柱形装药爆炸应力波峰值应力计算公式。研究结果表明:各爆炸破坏分区中爆炸应力波衰减规律存在显著差异,与中远区(过渡区和破裂区)相比,装药近区(拟流体区和压碎区)衰减更快,另外,柱形装药长径比增加会加快法向峰值应力的衰减;并且建立的爆炸应力波峰值应力计算公式可以较为准确快速地计算出不同形状、不同埋深下柱形装药爆炸应力波的法向峰值应力。
基金funding from Anhui Engineering Laboratory of Explosive Materials and Technology Foundation(No.AHBP2022B-04)Natural Science Research Project of Anhui Educational Committee(No.2023AH051221)+1 种基金Anhui Provincial Natural Science Foundation(No.2208085QA26)Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology for the project related to this work.
文摘Accurately forecasting the triple point(TP)path is essential for analyzing blast loads and assessing the destructive effectiveness of the height of burst explosion.Empirical models that describe the TP path under normal temperature and pressure environments are commonly employed;however,in certain configurations,such as at high-altitudes(HAs),the environment may involve low temperature and pressure conditions.The present study develops a theoretical prediction model for the TP path under reduced pressure and temperature conditions,utilizing the image bursts method,reflected polar analysis,and dimensional analysis.The model's accuracy is evaluated through numerical simulations and experimental data.Results indicate that the prediction model effectively evaluates the TP path under diminished temperature and pressure conditions,with most predictions falling within a±15%deviation.It was found that the TP height increases with altitude.As the altitude rises from 0 m to 10,000 m,the average TP height increases by 61.7%,87.9%,109.0%,and 134.3%for the scaled height of burst of 1.5 m,2.0 m,2.5 m,and 3.0 m,respectively.Moreover,the variation in TP height under HA environments closely mirrors that observed under corresponding reduced pressure conditions.In HA environments,only the effect of low-pressure conditions on the TP path needs to be considered,as the environmental lowtemperature has a minimal effect.
