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首页> 外文期刊>Materials and structures >Low cycle fatigue behavior of constraint connections Part Ⅱ: influence of material parameters
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Low cycle fatigue behavior of constraint connections Part Ⅱ: influence of material parameters

机译：约束连接的低周疲劳行为第二部分：材料参数的影响

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The influence of microstructure and material properties on reverse low-cycle fatigue performance has been investigated using small-scale test specimens with different constraint severities. The steel specimens were heat-treated to produce microstructures similar to the fusion line in welded steel moment resisting frames (SMRFs) with various yield strengths and toughness values. The reverse cyclic tests revealed that toughness has almost no influence on the cyclic performance if the steel is constraint. A performance enhancing material parameter, on the other hand, for mostly crack initiation controlled cyclic resistance, is high yield strength. High yield strength reduces the corresponding local strains at the notch tip, unless high nominal stresses cause an early ductile crack initiation, which results in poor cyclic resistance regardless of material properties and amount of constraint. While high toughness is still important to enhance the fracture strength in order to accommodate the maximum imposed stresses/strains in earthquake loading, high yield strength plays the key role in the general cyclic performance below this critical value. This in general applies to different structural steels as well as microstructural changes due to welding procedures in SMRFs. Material properties that are required tornresist fracture are different from material properties that enhance cyclic performance of constraint connections.
机译：微观结构和材料性能对反向低周疲劳性能的影响已使用具有不同约束强度的小规模试样进行了研究。对钢样品进行热处理，以产生类似于熔合线的微结构，其焊接钢制抗弯框架（SMRF）具有不同的屈服强度和韧性值。反向循环试验表明，如果钢受约束，韧性几乎对循环性能没有影响。另一方面，对于主要由裂纹引发控制的循环电阻的性能增强材料参数是高屈服强度。较高的屈服强度会减小缺口尖端处的相应局部应变，除非较高的公称应力导致早期的延性裂纹萌生，这将导致较差的循环阻力，而与材料特性和约束量无关。虽然高韧性对于增强断裂强度以适应地震载荷中的最大施加应力/应变仍然很重要，但低于该临界值时，高屈服强度在总体循环性能中起着关键作用。通常，这适用于不同的结构钢，以及由于SMRF中的焊接程序引起的微观结构变化。撕裂断裂所需的材料特性不同于增强约束连接的循环性能的材料特性。

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