静态和冲击变形下金属表面应力状态的x射线衍射研究

IF 0.2 Q4 INSTRUMENTS & INSTRUMENTATION
A. Kren, M. Delendik, O. Matsulevich, O. Gusev, K. Pantsialeyeu, R. Vorobey
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引用次数: 0

摘要

研究塑料印痕内部及其周围的应力场具有重要的实际意义。在抛丸爆破中使用类似压痕的过程来硬化材料表面并在表层产生压应力。本工作的目的是研究塑料印痕区域应力-应变状态随载荷的增加、变形由小变形到大变形的变化,以及不同应变速率下的应力变化。采用x射线衍射法研究了球形压头压入金属后形成的压痕区塑性变形表面残余应力场。分析了钢和铝在10 ~ 60µm塑料压印深度范围内应力分布随载荷增加的变化规律。研究了加载速率对碰撞体法向接触残余应力变化的影响。结果表明,应力分布与金属的压缩面积和拉伸面积具有复杂的特征,并由压痕深度与压痕直径的比值决定。获得的实验数据使确定最佳抛丸方式的选择成为可能,包括提高产品的耐久极限。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
X-ray Diffraction Method in the Study of a Metal Surface Stress State Under Static and Impact Deformation
Study of the stress field in a plastic imprint and around it is of great practical importance. Processes similar to indentation are used in shot blasting to harden the surface of materials and generate compressive stresses in the surface layers. The purpose of this work was to study the change in the stress-strain state in the area of the plastic imprint with increasing load, in the transition from small to large deformations, as well as to study the change in stress at different strain rates.X-ray diffraction method was used to study the field of residual stresses generated on the surface of a plastically deformed region – in the zone of an imprint formed when a spherical indenter is pressed into the metal. An analysis of the change in the stress distribution with increasing load in the range of plastic imprint depths of 10–60 µm for steels and aluminum was made. Influence of the loading rate on the change in the values of residual stresses under normal contact of colliding bodies was studied. It is shown that the stress distribution has a complex character with areas of compression and tension of the metal and is determined by the ratio of the indentation depth to its diameter.The obtained experimental data make it possible to determine the choice of optimal modes of shot blasting, including for increasing the endurance limit of products.
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来源期刊
Devices and Methods of Measurements
Devices and Methods of Measurements INSTRUMENTS & INSTRUMENTATION-
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25.00%
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8 weeks
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