THE INFLUENCE OF MAXWELL STRESS ON THE FRACTURE MECHANICS OF 2D PIEZOELECTRIC MATERIALS BASED ON THE PS MODEL

摘要：

The present work studies the influence of Maxwell stress on a straight but non-linear polarization saturation (PS) crack in a 2D piezoelectric material under combined mechanical and electric loadings at infinity.The non-linear piezoelectric fracture mechanics model,which is the PS model,is adopted in this paper.It is assumed that the crack is electrically semi-permeable.Based on the Stroh’s formalism and the dislocation modelling of a crack,we derive the relationships of the field intensity factors and the local J-integral to the strip zone,the applied mechanical and electric loadings.Numerical results are also presented to discuss the effects of Maxwell stress on the intensity factors of stresses,the electric displacement and the size of the electrically yielded zone.It is found that the Maxwell stress can relieve the crack growth under a given mechanical and electric loading,especially for the case of low mechanical loading and high electric loading applied at infinity.It is also shown that the normalized stress intensity factor increases with both the mechanical and electric loading.

关键词： Piezoelectric fracture Maxwell stress Polarization saturation (PS) model Semi-permeable crack Stress intensity factor

作者: Yu-hao LI Lu-qiao QI Cun-fa GAO

作者单位: State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P.R. China

会议类型: 国际会议

会议名称: The 2016 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2016全国压电和声波理论及器件技术研讨会)

会议地点: 西安

会议语种:英文

页码: 81-86

在线出版日期: 2016-10-21（万方平台首次上网日期，不代表论文的发表时间）