Limited Versus Unlimited Strain Accumulation Due to Ratcheting Mechanisms

Limited Versus Unlimited Strain Accumulation Due to Ratcheting Mechanisms
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棘轮机构导致的有限应变积累与无限应变积累

DOI:
10.1115/1.4042853
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发表时间:
--
期刊:
Journal of Pressure Vessel Technology
影响因子:
--
通讯作者:
Vollrath
Vollrath
中科院分区:
--
文献类型:
--
作者:
Hübel;Vollrath

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在区分材料棘轮和结构棘轮的基础上,归纳了与结构棘轮相关的各种现象。弹塑性结构在载荷位置固定时的棘轮效应不同于移动载荷时的棘轮效应。这两类都有例子说明。演化规律的内部变量描述运动硬化的累积应变由于棘轮机制的效果,以及棘轮机制是否停止与循环次数,使累积的应变是有限的,进行了讨论。给出了Chaboche模型发生安定的条件。其中安定是保证在每个负载水平的情况下,或它可能会或可能不会发生在一个特定的负载水平,或它肯定不会发生在任何负载水平,区分。相应地,安定分析,这是寻找最大的载荷系数,确保安定,或直接(或简化)的方法,以获得安定后的数量,避免增量循环分析的有用性进行了讨论。
After distinguishing material ratcheting and structural ratcheting, different phenomena related to structural ratcheting are gathered. Ratcheting of elastic–plastic structures observed with stationary position of loads is distinguished from ratcheting with moving loads. Both categories are illustrated by examples. The effect of evolution laws for the internal variables describing kinematic hardening on the accumulation of strain due to a ratcheting mechanism, and whether the ratcheting mechanism ceases with the number of cycles so that the accumulated strains are limited, is discussed. Some conditions are shown, under which the Chaboche model can lead to shakedown. Scenarios where shakedown is guaranteed at every load level, or where it may or may not occur at a specific load level, or where it definitely cannot occur at any load level, are distinguished. Correspondingly, the usefulness of shakedown analyses, which are searching for maximum load factors assuring shakedown, or direct (or simplified) methods to obtain postshakedown quantities by avoiding incremental cyclic analyses is discussed.
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