The circumferential normal stress is tensile.
周向正应力是张性的。
A normal stress is positive if it is tensile.
如果是拉应力，则该应力为正。
Objective: To realize normal stress distribution of lumbar vertebral body.
目的：了解正常人腰椎椎体的应力分布特点。
Objective: To realize normal stress distribution of lumbar vertebral body.
目的：了解正常人腰椎椎体的应力分布特点。
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