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piezoelectric voltage constant
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     The properties(piezoelectric voltage constant g33=42.8 V·m/N,piezoelectric strain constant d33=30 pC/N)of the composite prepared by microwave irradiation technique are more suitable for hydrophone.
     但微波工艺合成的复合材料的界面结合更好,有利于压电陶瓷的极化,其压电电压系数g33达42.8(V.m/N),更适合作为接收型传感器。
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     The finite element method was also adopted to forecast the effective electroelastic properties and to confirm the accuracy of the model. The hydrostatic piezoelectric strain constant(d__h),hydrostatic piezoelectric voltage constant(g__h),and hydrostatic figure of merit(d__h·g__h) of type 2-3 composites were calculated,and the lower hydrostatic performance was obtained.
     然后用有限元方法(使用了有限元分析软件ANSYS)分析了压电复合材料的材料常数,并用有限元方法验证了均匀场理论求解2-3型压电复合材料有效特性参数的准确性。
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  piezoelectric voltage constant
In order to accommodate such high dynamic pressure the transducer and cap materials were modified and it was found that the higher piezoelectric voltage constant ceramic provided the higher output power.
      
The film with a looser microstructure could have a substantially higher piezoelectric voltage constant g33 due to the much lower dielectric constant.
      


Piezoelectric composites were prepared through microwave irradiation.The effect of three techniques(cold-temperature-pressing,hot-temperature-calendering and microwave irradiation) on microstructure,dielectric and piezoelectric properties of the composites were investigated.Microwave irradiation technique and hot-temperature-calendering technique are superior to cold-temperature-pressing technique.The piezoelectric strain constant d33 was about 30 pC/N.Microwave irradiation technique improves the interfacial...

Piezoelectric composites were prepared through microwave irradiation.The effect of three techniques(cold-temperature-pressing,hot-temperature-calendering and microwave irradiation) on microstructure,dielectric and piezoelectric properties of the composites were investigated.Microwave irradiation technique and hot-temperature-calendering technique are superior to cold-temperature-pressing technique.The piezoelectric strain constant d33 was about 30 pC/N.Microwave irradiation technique improves the interfacial interaction between the piezoelectric ceramic powders and the matrix owing to physical effects,which is of benefit to pole the piezoelectric ceramic.The properties(piezoelectric voltage constant g33=42.8 V·m/N,piezoelectric strain constant d33=30 pC/N)of the composite prepared by microwave irradiation technique are more suitable for hydrophone.

利用微波原理合成出性能优良的压电复合材料,并研究了不同合成方法对复合压电材料的结构、介电和压电性能的影响。研究表明,微波合成与热压工艺获得的复合材料性能明显优于冷压工艺,两者的压电应力常数d33均在30pC/N左右。但微波工艺合成的复合材料的界面结合更好,有利于压电陶瓷的极化,其压电电压系数g33达42.8(V.m/N),更适合作为接收型传感器。

Piezoelectric composites imply that piezoelectric ceramics are connected with inactive polymer.The present work deals with the micro-mechanics model of type 2-3 composites.Series and parallel models were proposed to predict the elastic,piezoelectric and dielectric constants.Based on the linear piezoelectric theory and uniform field theory,the closed form formulae for the model were derived.The finite element method was also adopted to forecast the effective electroelastic properties and to confirm the accuracy...

Piezoelectric composites imply that piezoelectric ceramics are connected with inactive polymer.The present work deals with the micro-mechanics model of type 2-3 composites.Series and parallel models were proposed to predict the elastic,piezoelectric and dielectric constants.Based on the linear piezoelectric theory and uniform field theory,the closed form formulae for the model were derived.The finite element method was also adopted to forecast the effective electroelastic properties and to confirm the accuracy of the model.The hydrostatic piezoelectric strain constant(d__h),hydrostatic piezoelectric voltage constant(g__h),and hydrostatic figure of merit(d__h·g__h) of type 2-3 composites were calculated,and the lower hydrostatic performance was obtained.To attain higher hydrostatic performance,the electrode was improved.A comparison was carried out for the hydrostatic performance of type 2-3 composites and type 3-2 composites.The results predicte that the optimum hydrostatic response is gained by using improved type 2-3 composites or type 3-2 composites.

压电复合材料是由至少一种压电材料与非压电材料按照一定的连通方式组合在一起而构成的具有压电效应的材料。采用均匀场理论,提出了2-3型压电复合材料的代表性体积单元,通过建立串联、并联等模型预估了压电复合材料的弹性刚度常数:C11、C12、C13、C22、C23、C33,压电常数:e31e、32e、33,介电常数:3ε3。然后用有限元方法(使用了有限元分析软件ANSYS)分析了压电复合材料的材料常数,并用有限元方法验证了均匀场理论求解2-3型压电复合材料有效特性参数的准确性。根据求得的有效特性参数进一步研究了2-3型压电复合材料的静水压性能,由于求得的静水压性能值很低,又改良了2-3型压电复合材料的模型,获得了较好的静水压性能。并将改良前后2-3型压电复合材料与3-2型压电复合材料的静水压性能进行了比较。

 
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