摘要
为求缩颈阶段的真应力,分析了试样缩颈过程。结果表明,最小缩颈截面运动的轨迹是一个锥面外凹的虚拟圆锥体,它与缩颈体是完全不同的两个体,应该用前者而非后者的截面积(半径)去求真应力。推导证明,缩颈半径点(缩颈最小横截面与缩颈最上端母线的交点)的轨迹线是一条向上凹、严格单调减及导数逐渐减小的曲线,提出了一种轨迹线方程的图解求法。由此指出,计算缩颈阶段真应变时,应以参与缩颈的长度而非试样的标距为初始长度。
For finding the true stress on necking period, the necking process of sample is analysed, and the result is that, the moving track on minimum necking section is a dummy cone with concave surface, different from necking body, the true stress should be by the former sectional area （or radius） , not the latter. The reasoning proves that the track of necking radius point （the cross point of necking minimum section and necking top generatrix） is a curve with upper concave, monotony strictly decreasing and derivative lowering gradually. A diagrammatic solution on truce formula is put forword, and the beginning length pointed out is concerning necking length when calculating necking period true stress, not sample＇s scale distance.
出处
《理化检验（物理分册）》
CAS
2008年第8期427-430,共4页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
应力
应变
缩颈
应变强化
Stress
Strain Necking
Strain strengthening
