Mechanical Behavior Laboratory University of Nevada, Reno

Jixi Zhang, Ph.D.

Jixi Zhang, Ph.D.

Jixi Zhang, Ph.D.

Postdoctoral Scholar

Mechanical Engineering Department,
MS 312, University of Nevada, Reno
Reno, NV, 89557

Phone: 775-784-7028
Fax: 775-784-1701
Email: jixiz@unr.edu
Curriculum Vitae

Education

PhD 2004, University of Nevada, Reno
MS 1994, Southwest Jiaotong University, Chengdu, China
BS 1991, Tsinghua University, Beijing, China

Research Activities

My research activities focus on the integrated study of mechanical behavior and materials science, including strength and fracture of metal matrix composites (MMCs), experimental investigations on cyclic plastic deformation, fatigue, and associated substructures of structural materials, multi-scale constitutive modeling, characterization and rendering of 3D realistic complex microstructures, and optimization of microstructure and mechanical properties based on computational mechanics. The overall goal of my research is to understand the deformation and failure mechanisms of structural materials and develop multi-scale mechanism-based models to predict material behavior under various loading conditions.

(1) manufacturing of short-fiber reinforced aluminum alloy matrix composites by squeeze casting technique; (2) strength and fractographs of aluminum matrix composites at room temperature and elevated temperatures, (3) in situ observation of fracture process of MMCs by SEM and TEM; (5) prediction of the mechanical properties of MMCs considering fracture mechanisms.

Fig. 1

Distribution of short fibers in d-Al2O3/Al-5.5Mg composite. [J9]

Fig. 2

In-situ tensile process of d-Al2O3/Al-5.5Mg composite. [J9]

Fig. 3

Tensile fracture surface of d-Al2O3/Al-5.5Mg composite, indicating many heads of broken fibers and dimples. [J9]

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(1) cyclic plastic deformation of typical metallic materials under various cyclic loading conditions; (2) evolution of slip patterns; (3) evolution of dislocation substructures; (4) the relationship between macroscopic mechanical properties and microscopic substructure parameters; (5) the mechanisms of the formation of typical dislocation substructures in metallic materials.

Fig. 4

Slip pattern of OFHC copper under 90 degree out-of-phase [J13]

Fig. 5

Evolution from dislocation tangles into cell walls of OFHC copper under fully reversed tension-compression at an axial strain amplitude of 0.15% [J17]

Fig. 6

Relationship between equivalent stress magnitude and reciprocal of dislocation cell size of OFHC copper [J17]

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(1) Luders band formation and propagation under multiaxial stress state; (2) inhomogeneous cyclic plastic deformation phenomenon and the associated evolution of dislocations of mild steels under fully reversed stress-controlled cyclic loading with the stress amplitude much lower than the yield stress.

Fig. 7

Small bonded strain gages on tubular specimen [J11]

Fig. 8

Axial stress-strain curve and formation of Luders band under biaxial tension-torsion [J11]

Fig. 9

Shear stress-strain curve under biaxial tension-torsion [J11]

Fig. 10

Variation of local axial strain with time under biaxial tension-torsion [J11]

Fig. 11

Variation of local shear strain with time under biaxial tension-torsion [J11]

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(1) constitutive model of cyclic plastic deformation; (2) constitutive model of crystal plasticity; (3) multiaxial fatigue criterion based on the critical plane approach.

Fig. 12

Comparison of stabilized hysteresis loops of OFHC copper under tension-compression [J22]

Fig. 13

Comparison of stress response of OFHC copper under 90 degree out-of-phase nonproportional loading [J22]

Fig. 14

Fit for stress-strain curve of tested Ti-6Al-4V for the room temperature uniaxial strain history with multiple strain rates and strain hold periods [J16]

Fig. 15

Comparison of experimental data and predicted fatigue lives of OFHC copper [J14]

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(1) 3D Voronoi tessellation; (2) efficient simulated annealing algorithms to specify the grain-size distribution, phase distribution and texture; (3) meshing of 3D complex microstructures; (4) microstructure-based finite element analysis.

Fig. 16

Simulation of a dual phase microstructure: a grains and lamellate (a+b) grains (To be published)

Fig. 17

Comparison of simulated and target grain orientation distributions [J16]

Fig. 18

Meshing of 3D non-periodic polycrystalline microstructure with C3D4 elements (To be published)

Fig. 19

Meshing of 3D periodic polycrystalline microstructure with C3D4 elements (To be published)

Fig. 20

Simulation of microstructure sampled on failure plane and the corresponding 3D FE models (cut views on the midsection planes) [J19]

Fig. 21

Contours of fatigue indicator parameter (FIP) [J19]

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Publications

  • Journal Papers

[J22] Zhang, J. and Jiang, Y., Constitutive modeling of cyclic plasticity deformation of a pure polycrystalline copper, International Journal of Plasticity 24, (2008), pp. 1890-1915.

[J21] Jiang, Y. and Zhang, J., Benchmark experiments and characteristic cyclic plasticity deformation, International Journal of Plasticity 24, (2008), pp. 1481-1515.

[J20] Zhao, T., Zhang, J., and Jiang, Y., A study of fatigue crack growth of 7075-T651 aluminum alloy, International Journal of Fatigue 30, (2008), pp. 1169-1180.

[J19] Zhang, J., Prasanna, R., Shenoy, M. M., and McDowell, D. L., Modeling fatigue crack nucleation at primary inclusions in carburized and shot-peened martensitic steel, Engineering Fracture Mechanics, 2008, doi: 10.1016/j.engfracmech.2008.10.011.

[J18] Prasanna, R., Zhang, J., and McDowell, D. L., Subsurface fatigue crack nucleation at primary inclusions in carburized and shot peened high strength steels: 3D finite element modeling strategy, Accepted by International Journal of Fatigue, 2008.

[J17] Zhang, J. and Jiang, Y., An experimental study of the formation of typical dislocation patterns in polycrystalline copper under cyclic shear, Acta Materialia 55, (2007), pp. 1831-1842.

[J16] Zhang, M., Zhang, J., and McDowell, D. L., Microstructure-based crystal-plasticity modeling of cyclic deformation of Ti-6Al-4V, International Journal of Plasticity 23, (2007), pp. 1328-1348.

[J15] Shenoy, M., Zhang, J., and McDowell, D. L., Estimating fatigue sensitivity to polycrystalline Ni-base superalloy microstructures using a computational approach, Fatigue & Fracture of Engineering Materials & Structures 30, (2007), pp. 889-904.

[J14] Zhang, J. and Jiang, Y., Fatigue of polycrystalline copper with different grain sizes and texture, International Journal of plasticity 22, (2006), pp. 536-556.

[J13] Zhang, J. and Jiang, Y., An experimental investigation on cyclic plastic deformation and substructures of polycrystalline copper, International Journal of Plasticity 21, (2005), pp. 2191-2211.

[J12] Zhang, J. and Jiang, Y., An experimental study of inhomogeneous cyclic plastic deformation of 1045 steel under multiaxial cyclic loading, International Journal of Plasticity 21, (2005), pp. 2174-2190.

[J11] Zhang, J. and Jiang, Y., Luders bands propagation of 1045 steel under multiaxial stress state, International Journal of Plasticity 21, (2005), pp. 651-670.

[J10] Zhang, J. and Jiang, Y., A study of inhomogeneous plastic deformation of 1045 Steel, ASME Journal of Engineering Materials and Technology 126, (2004), pp. 164-171.

[J9] Kang, G., Yang, C., and Zhang, J., Tensile properties of randomly oriented short d-Al2O3 fiber reinforced aluminum alloy composites. I. microstructure characteristics, fracture mechanisms and strength prediction, Composites Part A: Applied Science and Manufacturing, 33A, (5), (2002), pp. 647-656.

[J8] Kang, G., Yang, C., and Zhang, J., Strengths and fracture mechanisms of Al2O3 short fiber reinforced Al-Mg alloy matrix composite at elevated temperatures, Journal of Materials Science and Technology, 18, (3), (2002), pp. 257-260.

[J7] Kang, G., Gao, Q., and Zhang, J., Tensile elastic modulus, strength and fracture of d-Al2O3/Al alloy composites, Journal of Materials Science and Technology, 16, (5), (2000), pp. 475-480.

[J6] Kang, G., Gao, Q., and Zhang, J., Analysis and modeling of tensile behavior of d-Al2O3/Al alloy composites, Engineering Mechanics (Chinese), 17, (5), (2000), pp. 44-51.

[J5] Yang, C., Liu, S., Zhang, J., and Lei, T., Tensile fracture process and interfacial strength on d-Alumina short fiber reinforced aluminum alloys, Chinese Journal of Materials Research, 13, (3), (1999), pp. 334-336.

[J4] Zhang, J., Yang, C., Liu, S., Zhang, X., and Kang, G., Tensile strength and fracture mode of d-Alumina short fiber reinforced aluminum alloys, Chinese Journal of Material Research, 12, (3), (1998), pp. 282-286.

[J3] Yang, C., Liu, S., and Zhang, J., Research on fracture process and strength mechanism of Al matrix composites reinforced by two kinds of Al2O3 short fibers, Acta Materiae Compositae Sinica, 14, (1), (1997), pp. 27-32.

[J2] Zhang, X., Liu, S., Gao, Q., Zhang, J., and Qin, S., TEM investigation on cracking in Al2O3 short fiber /Al-5.5Zn composite, Acta Materiae Compositae Sinica, 14, (2), (1997), pp. 45-49.

[J1] Zhang, J., Yang, C., and Liu, S., Tensile strength and fracture mechanism of short d-alumina fiber/aluminum alloy metal matrix composites, Acta Materiae Compositae Sinica, 14, (1), (1997), pp. 33-37.

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  • Conference Proceedings

[C7] Jiang, Y., and Zhang, J., Constitutive modeling of cyclic hardening, nonproportional hardening, and stain ratcheting in cyclic plasticity, Plasticity, 2008.

[C6] Jiang, Y., and Zhang, J., Constitutive modeling of cyclic hardening and nonproportional hardening of polycrystalline copper, Fifth International Conference on Nonlinear Mechanics, 2007.

[C5] Zhang, M., Zhang, J., McDowell, D. L., and Neu, R. W., Investigation of complex polycrystalline grain structures on fretting of duplex Ti-64 using 3D Voronoi tessellation, The 9th International Fatigue Congress 2006, Atlanta, USA.

[C4] Jiang, Y., and Zhang, J., 2005, Influence of grain size and texture on cyclic plastic deformation of polycrystalline copper, Plasticity, 2005.

[C3] Jiang, Y. and Zhang, J., 2004, Inhomogeneous cyclic plastic deformation of 1045 Steel, Proceedings of International Conference of Heterogeneous Materials Mechanics, Chongqing, China, June 21-26, 2004, pp. 185-188.

[C2] Zhang, J. and Jiang, Y., 2004, An investigation of nonproportional hardening of polycrystalline copper, Proceedings of International Conference of Heterogeneous Materials Mechanics, Chongqing, China, June 21-26, 2004, pp. 193-196.

[C1] Zhang, J., and Jiang, Y., 2002, Mechanisms of inhomogeneous cyclic plastic deformation of 1045 steel, 14TH US National Congress of Theoretical and Applied Mechanics, Blacksburg, VA, June 23-28, 2002.

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