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 last two factors induce borehole instability both by affecting stress distribution around wellbore and material properties of rock.
多层圆管结构在不稳定导热过程中的温度场及其热应力状态，关系到结构的安全可靠性。
The temperature field and the thermal stress state of multilayer Wall pipe have a heavy effect on the reliability of structure.
一定温度范围内聚烯烃均出现显著的应力波动现象，形变不均匀、不稳定。
In a certain range of tensile temperature, the stress strain behavior of polyolefins studied showed good similarity.
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