圆柱体（H／D＞1）镦粗时应力场计算的力学分块法

MECHANICAL SLAB METHOD OF THE STRESS FIELD CALCULATION FOR A CYLINDER (H/D>1) BEING UPSET

在主应力法的基础上，本文提出了力学分块法，推导出圆柱体（Ｈ／Ｄ＞１）在普通平板间镦粗时应力场的计算公式，并具体计算和分析了高径比Ｈ／Ｄ—１．６３的镦粗体内部的应力场。其计算结果同物理模拟［１］相符，并进一步证明与发展了刚塑性力学模型的拉应力理论［２］。

In this paper, the mechanical slab method is proposed based on the principal stress method, the calculation formulae of the stress field of a cylinder (H/D>1 ) being upset between common flat platens are dedued, and the stress field of an upset body with ratio of height to diameter H/D￣ 1. 63 is calculated and analysed. The calculation result is compared with the physical simulation[1], and the tension stress theory of a rigid-plastic-mechanical model is further testified and developed.