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含能材料  2014 

粒状发射药巴西试验的力学分析

DOI: 10.11943/j.issn.1006-9941.2014.06.024

Keywords: 材料力学,粒状发射药,巴西试验,抗拉强度

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Abstract:

针对发射药的受力特点,采用巴西试验对发射药的力学性能进行了试验研究,应用弹性接触理论和弹性力学平面问题的相关理论分析了其应力分布规律,结合Griffith强度准则得到了发射药抗拉强度的计算公式。结果表明,初始裂纹发生在发射药的中心部位,并发生对径劈裂,表明巴西试验适用于测量发射药的抗拉强度;发射药抗拉强度是由发射药破碎时的载荷和发射药和压头的接触面宽度决定;当储存时间由39a延长到47a时,发射药的抗拉强度由13.11MPa变为12.58MPa,减小4%。

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