under hardening

The cyclic hardening behavior under different loading paths and different load conditions was studied.

讨论了材料在不同加载路径及不同工况下的循环硬化特性.

Based on the creep curves of soft rock under uniaxial compression, a damage variable and a hardening function are introduced into creep model to express the nonlinear creep behavior of soft rock. A new nonlinear model for axial and lateral creep is established for soft rock.

根据对单轴压缩条件下软岩蠕变特性的分析，引入损伤变量和硬化函数，建立软岩轴向和横向非线性蠕变模型。

And it is found that the model can duplicate the transference of deformation mode from the strain softening under the low confining pressures to the strain hardening under the high confining pressures; and the brittleness index gradually reduces when the confining pressure is increased.

模拟结果表明：这一模型可以模拟低围压下的应变软化到高围压下的应变硬化现象，并且脆性指数随着围压的增大而逐渐减小。

DYNAMIC SHAKEDOWN ANALYSIS OF WORK-HARDENING STRUCTURES UNDER CYCLING LOADS Northwestern Polytechnical University

周期载荷下强化材料结构的动态安定性分析

In the present paper, the shakedown problems of power hardening and elastic power hardening thick-walled cylindrical tube under a cycling internal pressure are studied.

本文讨论了幂强化材料以及弹性&幂强化材料厚壁圆筒在循环内压作用下的安定性；

Characteristics of hydration and hardening process and strength properties of class G oilwell cement pastes with and without sand were studied under different temperatures by XRD, SEM, static gel Strength analysis and penetrability test.

研究了G级油井水泥在不同温度条件下的水化硬化特点及强度性能.使用静态浸泡的实验方法，考察了薄膜对合金耐蚀性的影响。