Interpretation of non-conventional miniaturized creep test: derivation of equivalent gauge length
Interpretation of non-conventional miniaturized creep test: derivation of equivalent gauge length
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非常规小型化蠕变试验解读：等效标距的推导
DOI：
10.1016/j.jmrt.2023.04.066
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Sun W
中科院分区：
文献类型：
--
作者：
Sun W
本文的目的是阐明小型化蠕变试验方法等效规长的性质。采用基于力学的方法，从非常规的小型化蠕变试验中获得稳态蠕变下的常规单轴蠕变数据。数据解释基于参考应力法。在此基础上，提出了一系列微型试件类型的等效厚度的理论推导，包括亚尺寸单轴试件、小冲孔试件、压痕试件、小环试件、微型试件、微型弯梁试件和微型弯板试件。然后评估了蠕变试验引起的几何变化对转换参数的影响。最后，讨论了与试件变形模式、相关方法的基础、“应变测量”的灵敏度、有效体积、测试方法的选择等相关的理论和实践问题。
The objective of this paper is to clarify the nature of the equivalent gauge length of miniaturized creep test methods. A mechanics-based approach was employed to allow conventional uniaxial creep data to be obtained from non-conventional miniaturized creep tests, under steady-state creep. The data interpretation is based on the reference stress method. On this basis, the theoretical derivation of the equivalent gauge lengths for a range of miniature specimen types is presented, including sub-size uniaxial, small punch, impression, small rings, miniature 2 bars, and miniature bending beams and plate. Then the effect of geometry change due to the creep test on the conversion parameters is evaluated. Finally, several theoretical and practical aspects, related to specimen deformation modes, the basis of the correlation methods, the sensitivity of “strain measurements”, the effective volumes, the choice of test methods, etc, are addressed.