Biaxially self - reinforced PE sheet was prepared by the die with complex stress field in critical state.
采用具有复合应力场的双向拉伸挤出口模,在临界状态下成功制备了聚乙烯双向自增强片材.
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But the stress - strain relationship is in complex stress condition after the necking starts.
但是,从颈缩开始,其应力应变关系处于复杂应力状态.
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