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首页> 外文期刊>Experimental Mechanics >Contribution of Kinematical and Thermal Full-field Measurements for Mechanical Properties Identification: Application to High Cycle Fatigue of Steels
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Contribution of Kinematical and Thermal Full-field Measurements for Mechanical Properties Identification: Application to High Cycle Fatigue of Steels

机译：运动学和热全场测量对机械性能鉴定的贡献：在钢高周疲劳中的应用

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摘要

The purpose of this work is to extend the use of unconventional tests and full field measurements (kinematical and thermal) to the identification of the effect of a wide plastic pre-strain range on the high cycle fatigue properties of a dual-phase steel. An unconventional specimen is designed. The geometry of this specimen permits a constant gradient of pre-strain to be obtained after a monotonic tensile test. Then, a self-heating test under cyclic loading is carried out on the pre-strained specimen. During this cyclic test, the thermal field is measured using an infrared camera. Finally, a suitable numerical strategy is proposed to identify a given thermal source model taking into account the influence of plastic pre-strain. The results show that, with the unconventional test and the procedure developed in this work, the influence of a plastic pre-strain range on fatigue properties can be identified by using only one specimen when, for a classical fatigue campaign, a great number of specimens is required.
机译：这项工作的目的是将非常规测试和全场测量（运动学和热学）的使用扩展到识别宽的塑料预应变范围对双相钢的高周疲劳性能的影响。设计了一个非常规的标本。该样品的几何形状允许在单调拉伸试验后获得恒定的预应变梯度。然后，在预应力试样上进行循环载荷下的自热测试。在此循环测试过程中，使用红外热像仪测量热场。最后，提出了一种适当的数值策略来考虑塑料预应变的影响来确定给定的热源模型。结果表明，通过这项非常规试验和制定的程序，可以通过仅使用一个样本来识别塑性预应变范围对疲劳性能的影响，而对于经典的疲劳试验，该样本只有大量的样本是必须的。

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