When this separation strains the cable material beyond its elastic limit, instability or birdcaging occurs in the form of the permanent deformation.
当内外股分离给缆线材料所造成的压力操作了弹性极限后， 易位或者不稳定的情况就会产生，进而造成永久的变形。
The last two factors induce borehole instability both by affecting stress distribution around wellbore and material properties of rock.
但后两者都是影响井壁应力分布和岩石力学性能而造成井壁不稳定。
The research results show that the blocking of second phase to dislocation is the main reason to cause microcracking and final instability of the material.
结果表明第二相粒子对位错的阻塞作用是造成微裂纹产生和材料最终失稳的主要原因。
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