能量释放作为增材制造金属疲劳设计的参数

Dario Santonocito, Andrea Gatto, Giacomo Risitano
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引用次数: 8

摘要

增材制造(AM)正在广泛的工业领域中传播。打印参数对机械性能的影响在研究人员中仍然是一个开放的问题,特别是在处理疲劳载荷时,这可能导致意外的故障。经典疲劳试验需要消耗大量的时间和材料。与传统的疲劳评价方法相比,热像法能够非常快速地得出材料的SN曲线和疲劳极限,并在疲劳试验过程中监测材料的能量释放。本文首次对采用SLM技术获得的aisi316l材料疲劳试验过程中的能量释放进行了研究。与文献数据相比,即使在低应力水平下,试样也表现出过早破坏,具有脆性断裂表面。内部微观结构似乎与材料的能量释放密切相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Energy release as a parameter for fatigue design of additive manufactured metals

Additive manufacturing (AM) is spreading in a wide range of industrial fields. The influence of the printing parameters on the mechanical performance is still an open issue among researchers, particularly when dealing with fatigue loads, which can lead to an unexpected failure. Classical fatigue tests require a large amount of time and materials to be consumed. Compared to the traditional fatigue assessment, the thermographic method (TM) is able to derive in a very rapid way the SN curve and fatigue limit of the material monitoring its energetic release during fatigue tests.

In this work, for the first time, the energetic release during fatigue test has been evaluated in specimens made of AISI 316L, obtained by SLM technique. Compared to literature data, the specimens show premature failure, even at low stress levels, with brittle fracture surfaces. The internal microstructure seems to be strictly related to the energetic release of the material.

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