作者:P. Vaucheret、A. Galtier
DOI:10.1051/metal:2002181
日期:2002.1
Discontinuities of microstructure in steels induce stress concentrations. Microplasticity is the plasticity which exists locally at these stress concentrations, whereas the remainder of the material is in the elastic domain. The microplasticity threshold is the nominal stress in uniaxial loading from which microplasticity exists. During fatigue tests, this threshold has been determined for the 304 L stainless steel by measurements of temperature variations, informations derived from hysteresis loops, observations of microstructure at the surface of polished specimens. The microplasticity threshold of the studied material is between 60 and 75 MPa.
钢材微观结构的不连续性会导致应力集中。微塑性是存在于这些应力集中处的局部塑性,而材料的其余部分则处于弹性区域。微塑性阈值是存在微塑性的单轴加载额定应力。在疲劳试验过程中,304 L 不锈钢的微塑性阈值是通过测量温度变化、滞后环得出的信息以及观察抛光试样表面的微观结构确定的。所研究材料的微塑性临界值在 60 至 75 兆帕之间。