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Experimental and analytical investig...

Luo, Huiyang.

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Experimental and analytical investigation of dynamic compressive behavior of intact and damaged ceramics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Experimental and analytical investigation of dynamic compressive behavior of intact and damaged ceramics./
作者:	Luo, Huiyang.
面頁冊數:	213 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1681.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168590
ISBN:	9780542045271

Experimental and analytical investigation of dynamic compressive behavior of intact and damaged ceramics.
Luo, Huiyang.

Experimental and analytical investigation of dynamic compressive behavior of intact and damaged ceramics. - 213 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1681.

Thesis (Ph.D.)--The University of Arizona, 2005.

The mechanical responses of the comminuted ceramic under impact is important in understanding penetration resistance of the target, modeling the penetration process, developing ceramic models and designing better armor systems. To determine the dynamic compressive responses of ceramic rubbles, a novel loading/reloading feature in SHPB experiments was developed to produce two consecutive loading pulses in a single dynamic experiment with two strikers and two shapers. The first pulse pulverizes the intact specimen into rubble after characterizing the intact material. After unloading of the first pulse, a second pulse loads the comminuted specimen and gives the dynamic constitutive behavior of the rubble.

ISBN: 9780542045271Subjects--Topical Terms:

783786
Engineering, Mechanical.

Experimental and analytical investigation of dynamic compressive behavior of intact and damaged ceramics.
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245 1 0 $a Experimental and analytical investigation of dynamic compressive behavior of intact and damaged ceramics.
300 $a 213 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1681.
500 $a Adviser: Weinong Chen.
502 $a Thesis (Ph.D.)--The University of Arizona, 2005.
520 $a The mechanical responses of the comminuted ceramic under impact is important in understanding penetration resistance of the target, modeling the penetration process, developing ceramic models and designing better armor systems. To determine the dynamic compressive responses of ceramic rubbles, a novel loading/reloading feature in SHPB experiments was developed to produce two consecutive loading pulses in a single dynamic experiment with two strikers and two shapers. The first pulse pulverizes the intact specimen into rubble after characterizing the intact material. After unloading of the first pulse, a second pulse loads the comminuted specimen and gives the dynamic constitutive behavior of the rubble.
520 $a With this new experimental technique, several series of experiments were conducted on an oxide ceramic---alumina AD995 and a non-oxide ceramic---hot pressed silicon carbide, SiC-N, with different strain rates, various volume dilatations and damaged levels under 26 MPa, 56 MPa and 104 MPa confinement. The results show that the strength of the damaged ceramic is not very sensitive to strain rates within this research range and the pulse separation once the damage attains a critical level. When slightly damaged far below a critical level, the specimen remains nearly elastic; when transitionally damaged, the specimen strength gradually decrease from the slight damage level to the heavy damage level. Increasing confinement increases the strength of the ceramics. The crack patterns were dominantly axial splitting for the slight damage, axial splitting and fragmentation for the intermediate damage, and fragmentation and comminution for the heavy damage. For SiC-N, the volume dilatation history shows a delayed failure. SEM observations indicated that microstructural failure mechanism is intergranular fracture for alumina and transgranular fracture for SiC-N.
520 $a Mohr-Coulomb criterion was successfully employed to describe the damaged ceramic and the parameters were determined. JH-1 model was employed to describe the failed SiC-N in the linearly segmentation description of the strength and the parameters were also determined. Through the analysis of JH-1 model for SiC-N, the critical damage level can be taken as D = 1.0. JH-2 model was used to describe analytically the damaged AD995 and the parameters were obtained. The critical damage value is 0.88 for alumina determined directly from JH-2 model. The description of JH-1 model is equivalent to Mohr-Coulomb criterion while it is unsuitable for JH-2 model due to the non-linear description. Based on the analysis of existing models and current experimental data, an empirical constitutive material model was developed for the damaged ceramic, which well described the completely damaged ceramic, but was unable to model the partially damaged ceramic.
590 $a School code: 0009.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 0 $a The University of Arizona. $3 1017508
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Chen, Weinong, $e advisor
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791 $a Ph.D.
792 $a 2005
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