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For Inspiration and Recognition of Sicence and Technology, FIRST is a sports-styled international robotics competition founded by Dean Kamen, the guy who invented the Segway and the insulin pump. The High-School level is called the FIRST Robotics Competition (FRC) and is …

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5 天之前 · 注1：该测试方法称为pent（宾夕法尼亚缺口测试）测试。 1.2测试通常在 80C 和 2.4 MPa 下进行，但也可以在低于 80C 的温度和其他足够低的应力下进行，以防止延性破坏，从而最终导致脆性破坏失败。

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本文提出了一种改进的宾夕法尼亚边缘缺口拉伸 (pent) 试验，该试验具有更高的负载和温度条件（2.8 mpa 和 90 °c）。使用改进的 pent 测试，失效时间缩短了六倍，但保持了缓慢的裂纹扩展。此外，它还评估并发现了应变硬化模量和试样厚度之间的意外关系。