这种局部变薄现象叫做腰缩或颈缩。
并以前面所学的观念探讨颈缩及劈裂破坏。
Necking and cleavage cracking are discussed in terms of prior concepts.
同时，对颈缩阶段中有关力学现象进行了简要的描述。
At the same time, some mechnical phenomena at necking stage are concisely described.
但是，从颈缩开始，其应力应变关系处于复杂应力状态。
But the stress-strain relationship is in complex stress condition after the necking starts.
分析认为：残余奥氏体在颈缩发生前的较完全转变有利于提高均匀延伸率；
The retained austenite transformation prior to the necking of the example enhanced the uniform elongation rate.
进行了一系列对低碳钢的试验以改进试件的设计并考察颈缩区模型的合理性。
A series of experiments on mild steel was conducted to improve the design of the DCB specimens and to examine the reliability of the necking zone model.
断裂时当马氏体体积分数增加到30%，颈缩提前，且微孔有向微裂纹转变的趋势。
Furthermore, the micropore in DP steel would change into microcrack when martensite volume fraction reached 30%. Meanwhile necking appeared early.
套筒滚子链套筒的颈缩对保证联接牢固度固然有好处，但对链条的质量却产生不良影响。
No doubt the bushing constriction of roller chain would be of great advantages for ensuring its reliable connection, but it would exert a bad influence on the quality of roller chain.
研究讨论缺陷对于拉伸变形的颈缩、稳定性的作用，这有利于正确理解和掌握超塑性拉伸变形过程。
So this paper will discuss the effect of defects on necking and stability of tensile deformation, which will help up to understand and master superplastic tensile deformation correctly.
弹性范围，塑料范围（当材料以不变的应力流动时），应变硬化范围和发生颈缩现象以其断裂终止的范围。
The elastic range, the plastic range (during which the material flows at a constant stress), the strain-hardening range, and the range during which necking occurs, terminating in fracture.
结果表明，在颈缩开始前的早期变形中，试样内部即已开始了微孔萌生、长大和连结等连续性丧失的过程。
The results indicate that the continuity loss such as void initiation, growth and coalescence begins in the early stage of deformation before necking.
本文用弹塑性大应变问题的等参数有限元分析程序(LEPS程序)，对平板和圆棒试件的颈缩作了较全面的分析。
An isoparametric finite element program of large elastic-plastic strain (LEPS) is used to analyse the necking of a cylindrical bar and a plate specimen under uniaxial tension.
当韧性材料被测试时，由于颈缩使横载截面面积减小，以至在受力没有增加的情况下引起应力的增加，以保证延伸继续如常进行。
When a ductile material is tested, the reduction in cross-sectional area due to waisting causes an increased stress without an increased force, to ensure that extension proceeds uniformly.
为了对多弧旁路gmaw (DB - GMAW)焊接过程中的熔滴过渡特征信息深入研究提供条件，对该种焊接方法下熔滴过渡图像颈缩部分边缘提取算法进行了研究。
In order to study metal transfer characteristics during dual bypass GMAW (DB-GMAW) process, many kinds of edge extraction algorithms were used to process the necking images of DB-GMAW metal transfer.
对巨型动脉瘤应采取暂时夹闭载瘤动脉、穿刺或切开乃至切除瘤体、缩窄瘤颈等综合措施而不是单纯夹闭瘤颈。
The procedures of temporary clipping the parent artery narrowing the aneurysmal neck and puncture or resection of aneurysmal body should be undertaken for giant aneurysms.
先用面颈联合野和颈前切线野照射，然后缩野改为耳前小野和颈部垂直野照射。
They were treated first with face neck joint portal and anterior neck portal, then treated with shrinkaged face portal and neck portal to curative or prophylactic doses.
先用面颈联合野和颈前切线野照射，然后缩野改为耳前小野和颈部垂直野照射。
They were treated first with face neck joint portal and anterior neck portal, then treated with shrinkaged face portal and neck portal to curative or prophylactic doses.
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