In support of NASA's Triton Hopper project, mechanical response data for solid nitrogen are needed for concept validation and development. Available mechanical properties data is sparse with only three known indentation measurements existing between 30 and 40 K. To generate more data, a custom instrumented hardness tester was developed to interface with a cryostat. The system was used to conduct cylindrical punch indentation testing at Triton-relevant thermodynamic conditions. Pressure versus displacement curves and hardness values were obtained. In the experiments the hardness ranged between about 2 kg/mm2 and 0.5 kg/mm2 in the aforementioned temperature range. A suspected brittle fracture is observed at lower temperatures in the range.

中文翻译：

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30-40 K 固体氮的仪器化圆柱冲头压痕

为了支持 NASA 的 Triton Hopper 项目，概念验证和开发需要固体氮的机械响应数据。可用的机械性能数据很少，只有三个已知的压痕测量值存在于 30 到 40 K 之间。为了生成更多数据，开发了一种定制的仪器化硬度测试仪来与低温恒温器连接。该系统用于在与 Triton 相关的热力学条件下进行圆柱冲头压痕测试。获得压力与位移曲线和硬度值。在实验中，硬度在上述温度范围内介于约 2 kg/mm2 和 0.5 kg/mm2 之间。在该范围内的较低温度下观察到疑似脆性断裂。