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Cycle symmetrization, asymmetrical behaviour and ratchetting during low cycle fatigue of high temperature alloys

机译：高温合金低循环疲劳时的循环对称性，不对称行为和咬合

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Strain-controlled (low-cycle fatigue type) experiments were performed on 12 different high temperature alloys (ferritic, austenitic, superalloys, single-crystal material, a directionally solidified alloy and two titanium alloys) in the range 550-950 degrees C. Symmetrical cycling conditions were suddenly changed to offset strain cycling at the same strain range, but in the tension or compression direction. Up to 50 cycles were allowed to determine the subsequent approach to symmetrical stress limits for each material (elastoplastic shakedown). Comparison is made with limited reported tests and related load-control tests involving strain ratchetting . Shakedown behaviour is shown to depend both on the path of approach, defined by stress-strain properties, but overall trends of stress versus cycle plots are best made by assuming an effective strain range which is less than the imposed experimental strain range.
机译：在550-950摄氏度范围内，对12种不同的高温合金（铁素体，奥氏体，高温合金，单晶材料，定向凝固的合金和两种钛合金）进行了应变控制（低周疲劳型）实验。突然改变循环条件以抵消在相同应变范围但在拉伸或压缩方向上的应变循环。允许多达50个循环来确定每种材料达到对称应力极限的后续方法（弹塑性振动）。与报告的有限测试和涉及应变拉切的相关负载控制测试进行了比较。减振行为显示出取决于应力-应变特性所定义的进近路径，但是通过假设有效应变范围小于施加的实验应变范围，可以最好地得出应力与循环图的总体趋势。

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