The effect of small variations of target hardness on the depth of penetration for long rodprojectiles (L/D = 15) penetrating into semi-infinite armor steel targets (nominally280 BHN–330 BHN) was investigated. The work consisted of hardness testing, 17 ballisticexperiments (1250 m/s–1780 m/s) and data analysis.A linear regression analysis shows that a target hardness increase within the given rangemay result in a reduction of penetration depth of about 5.8 mm at constant velocity (-12 %at an impact velocity of 1250 m/s). A multiple linear regression analysis including yawangle and impact velocity shows that small variations of those provide a smaller variation ofthe penetration depths than a typical variation of target hardness. The overwhelming part ofthe variation is to be attributed to hardness effects. For nominally identical target material,the target hardness influences the ballistic results more severely than the typical scatter inimpact conditions.
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机译：靶材硬度的微小变化对长棒穿透深度的影响
弹丸（L / D = 15）穿透到半无限装甲钢靶中（名义上
280 BHN–330 BHN）进行了调查。这项工作包括硬度测试，17弹道
实验（1250 m / s–1780 m / s）和数据分析。
线性回归分析表明，目标硬度在给定范围内增加
在恒定速度下可能会导致穿透深度减少约5.8 mm（-12％
以1250 m / s的冲击速度）。包含偏航的多元线性回归分析
角度和冲击速度表明，那些的较小变化提供了较小的变化。
穿透深度要比目标硬度的典型变化大。压倒性的一部分
该变化归因于硬度效应。对于名义上相同的目标材料，
目标硬度比常规散点对弹道结果的影响更大
影响条件。
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