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VARIATIONAL PRINCIPLFS OF NONLINEAR PIEZOTHERMOELASTIC MEDIA 被引量:4
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作者 Chen Changqing Shen Yapeng Tian Xiaogeng (Department of Engineering Mechanics,Xi’an Jiaotong University,Xi’an 710049,China) 《Acta Mechanica Solida Sinica》 SCIE EI 1998年第1期13-27,共15页
Through the phenomenological approach,the nonlinear constitutive equations coupling the electro/magnetic therrnoelastic media are derived.Several nonlinear variational principles for piezothermoelastic continua are pr... Through the phenomenological approach,the nonlinear constitutive equations coupling the electro/magnetic therrnoelastic media are derived.Several nonlinear variational principles for piezothermoelastic continua are presented and employed to formulate the incremental variational princi- ples which are of important significance in practical applications such as the nonlinear finite element analysis,the buckling,postbuckling and dynamic stability analyses of piezoelectric smart structures. 展开更多
关键词 smart systems piezoelectric material continuum mechanics incremental variational principles
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Strain gradient plasticity: energetic or dissipative? 被引量:3
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作者 N.A.Fleck J.R.Willis 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2015年第4期465-472,共8页
Abstract For an infinite slab of strain gradient sensitive material subjected to plane-strain tensile loading, compu- tation established and analysis confirmed that passivation of the lateral boundaries at some stage ... Abstract For an infinite slab of strain gradient sensitive material subjected to plane-strain tensile loading, compu- tation established and analysis confirmed that passivation of the lateral boundaries at some stage of loading inhibits plastic deformation upon further loading. This result is not surprising in itself except that, remarkably, if the gradient terms contribute to the dissipation, the plastic deformation is switched off completely and only resumes at a clearly defined higher load, corresponding to a total strain ec, say. The analysis presented in this paper confirms the delay of plastic deformation following passivation and determines the exact manner in which the plastic flow resumes. The plastic strain rate is continuous at the exact point ec of resumption of plastic flow and, for the first small increment Ae = e - ec in the imposed total strain, the corresponding increment in plastic strain, AeP, is proportional to (Ae)2. The constant A in the relation AeP(0) = A(Ae)2, where AeP(0) denotes the plastic strain increment at the centre of the slab, has been determined explicitly; it depends on the hardening modulus of the material. The presence of energetic gradient terms has no effect on the value of ec unless the dissipative terms are absent, in which case passivation reduces the rate of plastic deformation but introduces no delay. This qualitative effect of dissipative gradient terms opens the possibility of experimen- tal discrimination of their presence or absence. The analysisemploys an incremental variational formulation that is likely to find use in other problems. 展开更多
关键词 Strain gradient plasticity Boundary passivation incremental variational principle
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