Johannes Weertman  Walter P. Murphy Professor emeritus of Materials Science & Engineering and Adjunct Professor of Geological Sciences  D.Sc., Carnegie Institute of Technology, 1951  847-491-3197

Research Interests
Fatigue of metals, creep of crystalline solids, dislocation theory, geothermal energy, geophysics, mechanics of glaciers, ice ages, fracture and fatigue of metals.

Research Projects

I have been working on theories of fracture and of fatigue. My latest effort in this field has been the creation of the non-redundant dislocation density field method of solving problems involving cracks in elastic plastic solids. With this method, previously intractable crack problems have been solved.

Bibliography 1995 to present

1995

A dislocation grain boundary model with plastic deformation by dislocations,  (with J. A. Hurtado, B. R. Elliott, H. M. Shodja, D. V. Gorelikov, C. E. Campbell, H. E. Lippard and T. C. Isabell) Materials Science and Engineering,  A190,  pp. 1-7 (1995).

Non-redundant dislocation density field of a circular bar deformed in torsion and the stress gradient hardening effect, (with J. A. Hurtado)  physica status solidi (a), 149, 173-186 (1995)

The double slip plane model for the study of short cracks, (with C. A. Caracostas and H. M. Shodja), Mechanics of Materials, 20,  pp. 195-208 (1995).

HRR mode I crack tip field revisited with dislocations, (with J. A. Hurtado) in Micromechanics of Advanced Materials, James C. M. Li Symposium, edited by S. N. G. Chu, P. K. Liaw,  R. J. Arsenault, K. Sadananda, K. S. Chan, W. W. Gerberich, C. C. Chau and T. M. Kung, Minerals, Metals & Materials Society of the AIME, Warrendale, PA, pp. 79-85 (1995).

1997

High temperature stability and thermal expansion behavior of molybdenum-chromium M2C carbides, (with C. A. Knepfler, K. T. Faber, G. B. Olson, C. R. Hubbard, O. B. Cavin, and N. Packen), Journal of Alloys and Compounds, 248, pp. 139-142 (1997).

The Paris exponent and dislocation crack tip shielding, in High Cycle Fatigue of Structural Materials, The Paul Paris Symposium, edited by T. S. Srivatsan and Wolé Sobojeyo. Minerals, Metals & Materials Society (TMS) of the AIME, Warrendale, PA, pp. 41-48 (1997).

 'Pressurized' mode III crack in an elastic perfectly plastic solid, International Journal of Fracture, 87, pp. 87-100 (1997).

1998

Dislocations at ductile/plastic crack tips: in-situ TEM observarions,  (with K. Jagannadham and H. G. F. Wilsdorf),  Materials Research Innovation, 1, pp. 254-264 (1998).

Non-redundant and redundant dislocations in stress gradient fields, in Proceedings of the 19th Risø International Symposium on Materials Science.  Modelling of Structure and Mechanics of Materials from Microscale to Product, edited by J. V. Carstensen, T. Leffers, T. Lorentzen, O. B. Pedersen, B. F. Sørensen, and G. Winther, Risø National Laboratory, Denmark, pp. 169-183, (1998).

1999

Microstructural mechanisms in creep, in Mechanics and Materials: Fundamentals and Linkages, edited by M. Meyers, R. W. Armstrong and H. Kirchner, John Wiley, New York, pp.  451_488, (1999).

Dislocations in elliptical and in arbitrarily shaped holes in elliptical and orthoganal curvilinear coordinates, in Advanced Materials for the 21st Century, The Julia R. Weertman Symposium, The Minerals, Metals & Materials Society (TMS) of the AIME, Warrendale, PA, pp. 49-57, (1999).

Non-redundant dislocation density fields in polycrystalline solids, (with J. R. Weertman). in Proceedings of the 20th Risø International Symposium on Materials Science,  edited by J. B. Bilde_Sørensen, J. V. Carstensen, N. Hansen, D. Juul Jensen, T. Leffers, W. Pantleon, O. B. Pedersen, and G. Winther,  Risø National Laboratory, Denmark, pp. 201-212, (1999).

2000

Unnatural power law creep exponents, nonlinear monotonic and cyclic stress strain curves and similitude breaking, in Deformation, Processing, and Properties of Structural Materials, The Oleg D. Sherby Symposium, edited by E. M. Taleff, C. K. Syn, and D. R. Lesuer, The Minerals, Metals & Materials Society (TMS) of the AIME, Warrendale, PA, pp. 145-156, (2000).

Application of curvilinear coordinates to dislocation density fields around cracks in linear elastic-plastic solids, The Ben Mori Symposium, Materials Science and Engineering.  A Structural Materials, Properties, Microstructure and Processing, 285,  pp. 380-390 (2000).  Erratum  A293, p. 297 (2000).

Dislocation Based Fracture Mechanics, World Scientific Publishing, Singapore, 524 pages, 1996.  Japanese edition translated by Ishii, et al (Baifukan, Tokyo, 2000).

2001

Curvilinear coordinates for mode III crack plastic zone in work hardening solid, The Campbell Laird Symposium Volume, Materials Science and Engineering.  A Structural Materials, Properties, Microstructure and Processing, 314, pp. 100-107 (2001).

2002

Why the stress trajectories in the Dean-Huthchinson plastic sector of the growing mode III crack are an unfocused fan, Journal of the Mechanics and Physics of Solids,  50, pp. 153-163 (2002).

Anomalous work hardening, non_redundant screw dislocations in a circular bar deformed in torsion, and non_redundant edge dislocations in a bent foil,  Acta Materialia, .50, pp. 673-689 (2002).

Subsonic type earthquake dislocation moving at approximately  × shear wave velocity on interface between half spaces of slightly different elastic constants,  Geophysical Research Letters, 29, (10), pp. 109-1 to 109-4 (2002).

Effective dislocation free zone and effective stress intensity factor revisited for mode III crack, in Mechanisms & Mechanics of Fracture, The John Knott Symposium, edited by W. O. Soboyejo, J. J. Lewandowski and R. O. Ritchie, The Minerals, Metals & Materials Society (TMS), Warrendale, PA, pp. 31-36, (2002).

The Comninou-Dundurs Effect and position stability of subglacial lakes, Annals of Glaciology.  35, pp. 495-502 (2002).

2003

Asymptotic crack tip stress, rotation pseudo-stress field and dislocation fields for mixed mode I and II cracks in elastic perfectly plastic solids, Mechanics of Materials.  35, pp. 433-452 (2003).

Relationship between stress_strain potentials and maximum shear and zero shear trajectories for mode III crack, in Electron Microscopy: its Role in Materials Science (The Mike Meshii Symposium), edited by J.R. Weertman, M. Fine, K. Faber, D. Quesnel, W. King and P. Liaw, The Minerals, Metals & Materials Society (TMS), Warrendale, PA, pp. 107-112 (2003).

Cohesive solutions of intersonic moving dislocations (with S. Hao and W. K. Liu).  Philosophical Magazine.  (2003) (accepted for publication).

Stress and strain potentials for mode I and mode II cracks,  Mechanics of Materials,  (accepted for publication).

2004

Mode III crack in power law hardening solid, International Journal of Solids and Structures (in press).

Quasidislocation Stoneley Wave and Eshelby Dislocation Scholte Wave, Physical Review Letters (in press).

Slip event propagation direction in transition region of low surface slope, Annals of Glaciology (accepted for publication).

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