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首页> 外文会议>NDE/NDT for Highways and Bridges >Maximizing Inspection Cycles Utilizing Steel's own Material Properties to Arrest Cracks as an Effective Adjunct to NDE
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Maximizing Inspection Cycles Utilizing Steel's own Material Properties to Arrest Cracks as an Effective Adjunct to NDE

机译：利用钢的自身材料特性最大化检查循环将裂缝作为NDE的有效辅助

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摘要

Cracking in steel bridges is a common occurrence and necessitates periodic inspection to detect cracks. If detected, crack arrest holes (CAH) are commonly drilled at the tip of the crack and then monitored using NDE to verify crack arrest. These CAH are frequently ineffective in retarding crack growth and therefore may require more frequent inspection. An innovative aerospace derived technology, StopCrackEX, radically expands a high interference fit bushing into a hole drilled ahead of the crack tip. Besides creating a high interference fit in the hole, it also induces a compressive residual stress around the hole that shields the hole from cyclic loads. Tests confirm its effectiveness in arresting crack growth in typical bridge steel. The process is reviewed explaining how the inherent material properties enhance the fatigue and crack growth life and make the CAH more effective, and reduce the need for frequent re-inspection. As an effective adjunct to NDE that could be applied at time of crack detection, StopCrackEX could greatly reduce maintenance and repair cost, enhance the integrity of the bridge structure and reduce cost of ownership. Additionally, when NDE is not performed at the same time with the conventional crack repair, the StopCrackEX still offers effective crack arresting.
机译：钢结构裂缝是一种常见的发生，需要定期检查以检测裂缝。如果检测到，裂缝滞留孔（CAH）通常在裂缝尖端钻探，然后使用NDE监测以验证裂缝骤停。这些CAH经常在延迟裂纹生长方面无效，因此可能需要更频繁的检查。一种创新的航空航天衍生技术，StopCrackex，从根本上扩展到前面钻孔前面钻孔的孔中的高干涉配合套管。除了在孔中产生高盈盈适合外，它还引起孔周围的压缩残余应力，孔屏蔽孔的孔。试验证实了其在典型桥梁钢中抑制裂纹增长的有效性。综述该方法解释了固有的材料特性如何提高疲劳和裂纹生长寿命，使CAH更有效，并降低频繁重新检查的需要。作为在裂缝检测时可应用的NDE有效辅助的，StopCrackex可以大大降低维护和维修成本，提高桥梁结构的完整性，降低所有权成本。另外，当没有与传统裂缝修复同时进行NDE时，蒸馏屏仍然提供有效的裂缝抑制。

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