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本文提出了有关多晶体材料的晶粒中应变分布的试验和计算的方法。为此目的,专门设计了微观复杂应力试验机。试件有两种:光滑及有预制裂纹的铝合金(LY12)薄壁筒。在各种不同载荷条件下得出了多晶体的晶粒中的主应变曲线。本文还提出多晶体屈服准则。裂纹前端的应变分布证明用dε/dN标定ΔK_(th)要比用da/dN更准确。 由本文可得出另一有意义的结论:既使在一维加载情况下,晶粒中也有二维应变状态。这一事实对于裂纹的生成、扩展和多晶体强度的进一步研究都是重要的。
This paper presents experimental and computational methods for strain distribution in grains of polycrystalline materials. For this purpose, specially designed micro-complex stress testing machine. There are two test pieces: smooth and pre-cracked aluminum alloy (LY12) thin-walled tube. The main strain curve in the grains of the polycrystalline body was obtained under various load conditions. This article also presents polycrystalline yield criteria. The strain distribution at the tip of the crack proves that it is more accurate to calibrate ΔK_ (th) with dε / dN than with da / dN. Another interesting conclusion can be drawn from this paper: Even in the case of one-dimensional loading, there are two-dimensional strain states in the grain. This fact is important for the further study of crack formation, propagation and polycrystal strength.