基于纳米压痕方式测定PBX的弹性模量

Measurement of PBX Elastic Modulus by Nano-indentation

介绍了纳米压痕方式测定塑料粘结炸药弹性模量的理论和实验方法。选取以HMX的为基的模压塑料粘结炸药（PBX）的柱形（Ф20mm×4mm）样品，在其表面进行4×4（间距为10μm）点阵压痕实验，测定出该炸药在16个不同位置的弹性模量值。实验表明该型PBX模量值随着压入深度以及压痕位置发生变化。在压入深度为270～750nm之间的模量测定值较高，而在压入深度超过750nm后，模量值趋于稳定，测定值为6GPa，接近于传统方法的测量值。

The principle of nano-indentation and the test methods to measure modulus of PBX are described. A 4×4 array of indention test with 10 μm separation was performed on the surface of a cylinder PBX sample with chief constituent of HMX crystals. The results show that that values of modulus decrease with the increasing of indent depth but,when the depth reach deeper than 750 nm, the measured values keep stable and the average value of 6.0 GPa is close to that of traditional method.