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首页> 外文期刊>Journal of Materials Engineering and Performance >Estimation of Low Cycle Fatigue Response of 316 LN Stainless Steel in the Presence of Notch
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Estimation of Low Cycle Fatigue Response of 316 LN Stainless Steel in the Presence of Notch

机译：缺口存在下316 LN不锈钢的低循环疲劳响应的估计

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摘要

Notches introduced in the plain specimen result in the multiaxial state of stress that exists in the actual components due to the presence of flaws and defects. In the present work, low cycle fatigue life estimation of plain and notched specimens of 316 LN stainless steel is carried out at room temperature and 823 K. The plain and notched specimens with different notch radii were subjected to varying strain amplitudes ranging from +/- 0.25 to +/- 1.0% at a strain rate of 3 x 10(-3) s(-1). The fatigue life decreased in the presence of notch for all strain amplitudes at both the temperatures. The decrease in fatigue life was found to be more at room temperature than at 823 K. The fatigue life of the notched specimen decreased by approximately 94.2% compared to plain specimen at room temperature. However, at 823 K the decrease in fatigue life for notched specimen was approximately 84.6%. Low cycle fatigue life of the plain and notched specimens was estimated by Neuber's rule and finite element analysis approach. Neuber's rule overestimated the fatigue life by maximum factor of 2.6 for specimens at room temperature and by maximum factor of 5 for specimens at 823 K. However, it gives closer approximation at higher strain amplitudes at 823 K. Life estimation by finite element analysis at room temperature was within a factor of 1.5 as compared to experimental life, whereas it underestimated the fatigue life within a factor of 6 at high temperature.
机译：在普通标本中引入的凹口导致由于存在缺陷和缺陷而存在的实际部件中存在的多轴应力状态。在本作的工作中，在室温下进行316Ln不锈钢的普通和缺口标本的低循环疲劳寿命估计，并在室温下进行823k。与不同的Notch半径的普通和缺口标本进行不同的应变幅度范围从+/-以3×10（-3）S（-1）的应变速率为0.25至+/- 1.0％。对于在温度下的所有应变幅度的缺点存在下，疲劳寿命减少。发现疲劳寿命的降低在室温下比823 K更高。与室温下的普通样品相比，缺口样品的疲劳寿命减少了约94.2％。然而，在823K下，缺口样品的疲劳寿命的降低约为84.6％。通过Neuber的规则和有限元分析方法估算了平原和缺口标本的低周疲劳寿命。 Neuber的规则将疲劳寿命高估为2.6的最大因子，对于房间温度的标本和823k的样品最大5系数。然而，它在823k的较高应变幅度下给出更接近的近似。在房间的有限元分析寿命估算与实验寿命相比，温度在1.5的因子中，而它在高温下低估了6倍的疲劳寿命。

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