A computational mesoscale evaluation of material characteristics of porous shape memory alloys

被引：27

作者：

DeGiorgi, VG

Qidwai, MA

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] Geocenters Inc, Washington NRL Operat, Ft Washington, MD 20749 USA

来源：

SMART MATERIALS AND STRUCTURES | 2002年 / 11卷 / 03期

关键词：

D O I：

10.1088/0964-1726/11/3/314

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Computational techniques are used to estimate porous shape memory alloy material behavior in this study. Mesoscale analysis techniques based on a two-dimensional finite element method are used to evaluate a representative volume element (RVE) to determine effective material response. The porous shape memory alloy is defined as comprised of two constituents, dense NiTi shape memory alloy (SMA), and pores that are defined as free of all material and distributed randomly. An existing rate-independent type constitutive model is used to define the dense SMA material behavior. Open porosity is considered with the axis of generation perpendicular to the plane of the two-dimensional RVE. Pores are allowed to vary in size and shape with no limit on maximum pore size. Computational evaluations are completed for porous SMA for a range of pore volume fractions. Effective material behavior is calculated and results are compared with computationally determined material behavior based on the micromechanical unit cell finite element method. Calculated effective material elastic and transformation characteristics compare well between the two methods for low to moderate (less than or equal to0.3) pore volume fractions. Significant variations are seen for higher pore volume fractions (>0.3) due to spatial orientation and percolation effects that are not considered in unit cell analyses.

引用

页码：435 / 443

页数：9

共 27 条

[11] A modeling study of the effect of stress state on void linking during ductile fracture [J].

Geltmacher, AB ;

Koss, DA ;

Matic, P ;

Stout, MG .

ACTA MATERIALIA, 1996, 44 (06) :2201-2210

[12]

*HKS, 1994, ABAQUS VERS 5 4 US G

[13] Shape memory alloy TiNi actuators for twist control of smart wing designs [J].

Jardine, AP ;

Kudva, JN ;

Martin, C ;

Appa, K .

SMART STRUCTURES AND INTEGRATED SYSTEMS: SMART STRUCTURES AND MATERIALS 1996, 1996, 2717 :160-165

[14]

JIMENEZVICTORY JC, 1999, THESIS TEXAS A M U

[15] A mesoscale computer simulation of multiaxial yield in gasar porous copper [J].

Kee, A ;

Matic, P ;

Everett, RK .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 249 (1-2) :30-39

[16] Reversible shape memory behaviors of TiNi thin films processed by direct electric current heating [J].

Kuribayashi, K ;

Shimizu, S ;

Yoshitake, M ;

Ogawa, S .

MHS '96 - PROCEEDINGS OF THE SEVENTH INTERNATIONAL SYMPOSIUM ON MICRO MACHINE AND HUMAN SCIENCE: TOWARD MICRO-MECHATRONICS IN 21ST CENTURY, 1996, :131-136

[17]

Lagoudas D. C., 1996, Mechanics of Composite Materials and Structures, V3, P153, DOI 10.1002/(SICI)1234-986X(199606)3:2<153::AID-MCM36>3.3.CO

[18]

2-J

[19] Modeling of thermomechanical response of porous shape memory alloys [J].

Lagoudas, DC ;

Entchev, PB ;

Vandygriff, EL ;

Qidwai, MA ;

DeGiorgi, VG .

SMART STRUCTURES AND MATERIALS 2000 - ACTIVE MATERIALS: BEHAVIOR AND MECHANICS, 2000, 3992 :496-508

[20] Microstructure and superelasticity of porous NiTi alloy [J].

Li, BY ;

Rong, LJ ;

Li, YY .

SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES, 1999, 42 (01) :94-99

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