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首页> 外文期刊>International Journal of Plasticity >On the micro- and macroscopic elastoplastic deformation behaviour of cast iron when subjected to cyclic loading
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On the micro- and macroscopic elastoplastic deformation behaviour of cast iron when subjected to cyclic loading

机译：循环载荷时铸铁的微观和宏观弹塑性变形行为

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摘要

The complicated constitutive behaviour of cast iron, involving a non-linear elastic regime, tension-compression stress asymmetry, varying elastic modulus and an inflection in the tension-to-compression hardening curve, is investigated using a micromechanical modelling approach. In this way, it is demonstrated that the abnormalities observed in the constitutive behaviour are qualitatively and quantitatively explained by the interaction behaviour between the matrix and graphite constituents. In initial tension, the absence of linearity is rationalised by the successive loss in load-carrying capacity of the graphite phase due to debonding, which in subsequent cycling, results in the opening and re-contact of the matrix-graphite interface. This effect is demonstrated to result in tension-compression asymmetry in stress and elastic modulus, as well as the inflection in tension-to-compression loading. The given model of explanation is validated by comparison to the experimentally acquired microscopic strain field in EN-GJV-400 at locations where stress concentrations are generated due to the matrix-graphite debonding, using high-resolution digital image correlation of scanning electron images.
机译：使用微机械建模方法研究了涉及非线性弹性调节，涉及非线性弹性状态，张力 - 压缩应力不对称，不同弹性模量和张力 - 压缩硬化曲线中的拐点的复杂本构学行为。以这种方式，证明在组成型行为中观察到的异常是通过基质和石墨成分之间的相互作用行为定性和定量地解释。在初始张力中，由于剥离在随后的循环中，由于剥离而导致的石墨阶段的负载承载能力的连续损失，因此在循环中的开口和重新接触，导致基质 - 石墨界面的开口和重接界面的连续损失来合理地。证明了这种效果以导致应力和弹性模量的张力 - 压缩不对称，以及张力至压缩负荷的拐点。通过与矩阵 - 石墨剥离引起的ZH-GJV-400的实验获取的微观应变场进行验证，通过扫描电子图像的高分辨率数字图像相关来验证给定的解释模型。

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