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用箔电阻应变仪进行应变测量来研究侵彻过程中长杆的响应。在该项研究中,早期的实验是使用反向弹道试验法,卽用轻气炮发射装甲板撞击靜止不动的杆。虽然正碰撞和斜碰撞都得到了令人满意的结果,但是,反向弹道试验法苛刻地限制了靶的直径,而且靶的质量限制了碰撞速度,使它低于通常弹道意义的数值。为了克服这种反向弹道方法所造成的达些主要限制,已经发展了一种发射测试杆的方法。用这个方法,将杆上的应变仪和位于塑料弹托前表面的薄金属接触片连接。在碰撞前,一些靜止的探针刺穿接触片,从而在弹托大约100毫米的行程中,提供了低电阻通路。已经进行了一组正碰撞试验,钢杆速度为1000米/秒。从这些试验得到的应变随时间变化的曲线,可做单个波的分析,这些分析提供了应力和应变、质点速度和应变两关系且误差不超过应变的15％。讨论了分析结果和实验方法的关系。还详细地介绍了实验方法及其改进,讨论了问題的范围。
Strain measurements were made using a foil resistance strain gauge to investigate the response of the wand during penetration. In this study, an early experiment was the use of a reverse ballistic test, in which a light-weight cannon-fired deck was used to strike a stationary rod. Although both positive and oblique collisions have yielded satisfactory results, the reverse ballistic test harshly limits the diameter of the target, and the quality of the target limits the speed of the impact to a value below the usual ballistic value. In order to overcome some of the major limitations of this reverse ballistic approach, a method of firing test rods has been developed. In this method, the strain gauge on the rod is connected to a thin metal contact piece located on the front surface of the plastic bouncer. Before the collision, some still probes pierce the contact pads, providing a low resistance path during the approximately 100 mm stroke. A series of forward collision tests have been conducted at a speed of 1000 m / s. From the curves of strain versus time obtained from these tests, a single wave analysis can be performed that provides both stress and strain, particle velocity and strain relationships with an error of no more than 15% of strain. The relationship between analytical results and experimental methods is discussed. The experimental method and its improvement are also introduced in detail, and the scope of the problem is discussed.