发射药拉伸试验试样制备方法的改进

Improvement of the Sample-making Method for the Propellant Tensile Tests

为提高发射药拉伸性能测试的准确度,针对现有的辊片法制备拉伸试样的方法进行了改进,并提出了采用模压法制样的方法。通过拉伸性能测试、扫描电镜内部微结构观察、真密度测定等手段,对比研究辊片法、模压法、切削法等3种制样方法,探讨辊片法、模压法与实际发射药力学性能的差异。结果表明,辊片法制备的试样,其抗拉强度低于真实值,而模压法则更能接近实际发射药的性能。扫描电镜结果表明,由于制样工艺方法不同,模压法比辊片法能更好地反映实际发射药的情况,真密度测试也进一步证明了这一点。最后得出,采用模压法来改进发射药拉伸试验的制样方法更为合理。

In order to improve accuracy of propellant tensile test, a sample making method was improved aiming at current roller-pressing flake methods to make tensile samples, and a mould press method was presented. Through tensile performance test, interior micro-structure observation by SEM, real-density test, three sample-making methods,roller-pressing flake, mould-press and cutting,were studied contrastively. The differences of mechanical performances among toiler pressing flake, mould-press and real propellant were discussed. The results show that anti-tensile intensity of sample made by roller-pressing flake method is lower than real propellant, but mould-press method can be the same as reality. SEM research about interior micro-structure of sample shows that mould-press method can better reflect the reality of propellant than roller-pressing flake method. Real-density test further testifies it. It can be concluded that adopting mould press method to improve sample-making method of propellant tensile test is more reasonable.