Development of true-stress creep model through analysis of constant-load creep data with application to finite element methods
Development of true-stress creep model through analysis of constant-load creep data with application to finite element methods
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DOI：
10.1179/1743284714y.0000000539
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发表时间：
2014-11
影响因子：
1.8
通讯作者：
M. Connolly;M. Whittaker;S. Williams
中科院分区：
文献类型：
--
作者：
M. Connolly;M. Whittaker;S. Williams
通过一系列恒载荷蠕变试验研究了镍基高温合金RR 1000的蠕变行为。常假设恒载试验产生的蠕变数据由于产生的非恒定应力而不适于建立广义蠕变模型。现有模型的分析表明，显着的错误可能会发生在许多方法，试图重建应变随时间的演变。一个模型，这是不依赖于时间作为一个参数，因此能够利用恒定载荷蠕变数据，而不强制执行的假设一个恒定的应力。通过数值分析证明了该模型可以准确地复制大范围应力下的蠕变行为。然后，该模型被改编为Abaqus用户子程序，以证明在有限元分析的能力。
The creep behaviour of the nickel superalloy RR1000 is studied through a number of constant-load creep tests. It is often assumed that creep data generated by constant-load testing are unsuitable for building a generalised creep model due to the non-constant stresses incurred. Analysis of existing models shows that significant errors may occur in many approaches, which attempt to recreate the strain evolution with time. A model is presented which is not reliant on time as a parameter and is therefore able to utilise constant-load creep data without enforcing the assumption of a constant stress. This model is demonstrated through numerical analyses to replicate the creep behaviour across a large range of stresses accurately. The proposed model is then adapted as an Abaqus user-subroutine to demonstrate capability within finite element analysis.