Improved ratcheting analysis of piping components

被引：46

作者：

Hassan, T ^{[1
]}

Zhu, Y ^{[1
]}

Matzen, VC ^{[1
]}

机构：

[1] N Carolina State Univ, Ctr Nucl Power Plant Struct Equipment & Piping, Raleigh, NC 27695 USA

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 1998年 / 75卷 / 08期

关键词：

cyclic plasticity; ratcheting experiments; ratcheting analyses; piping analyses; ASME code;

D O I：

10.1016/S0308-0161(98)00070-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It is well known that ratcheting (defined as the accumulation of deformation with cycles) can reduce fatigue life or cause failure of piping components or systems subjected to seismic or other cyclic loads. This phenomenon is sometime referred to as fatigue-ratcheting, which is yet to be understood clearly. Commercial finite element codes cannot accurately simulate the ratcheting responses recorded in tests on piping components or systems. One of the reasons for this deficiency has been traced to inadequate constitutive models in the existing analysis codes. To overcome this deficiency, an improved cyclic plasticity model, composed of the Armstrong-Frederick kinematic hardening rule and the Drucker-Palgen plastic modulus equation, is incorporated into an ANSYS material model subroutine, The modified ANSYS program is verified against three sets of experimental results. The simulations from this modified ANSYS show a significant improvement over the unmodified ANSYS and the ABAQUS codes. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：643 / 652

页数：10

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