双基推进剂装药表面应变测量方法的研究

Research on Measurement Method of Surface Strain of Double-base Propellant Grain

为了研究直接粘贴应变片对推进剂装药表面应变测量的影响,通过试验研究了某双基推进剂的松弛和蠕变行为,分别获得了推进剂的应力松弛模量和蠕变应变.在获得应力松弛模量的基础上,运用有限元方法分析了应变片对测量推进剂试样表面应变在蠕变情况下的影响,并与文献中的试验数据进行了对比分析.研究表明,在短时间内应变片的测量结果有一定的精度,该研究可为接触测量方法产生误差机理及量值提供参考,并为数值计算的准确性提供试验依据.

In order to research the influence of pasting strain-gauge on measuring propellant surface strain, the relaxation and creep behavior of the double-base propellant were studied by tests. The stress relaxation modulus and creep strain were obtained respectively. The influence of strain-gauge on measuring propellant surface strain under creep conditions was analyzed by using the finite element method on the basis of obtaining stress relaxation modulus, and the obtained result was compared with the test data from the literature. The research shows that the strain- gauge measurement result has certain precision in a short time. The research offers the reference for contact measurement method producing error mechanism and value, and provides test basis for the accuracy of numerical calculation.