Results 221 to 230 of about 127,705 (267)

Fracture Face Damage—It Matters

Proceedings of SPE European Formation Damage Conference, 2005
Abstract The poorer-than-expected performance of some fracturing treatments has been an issue for decades. Considerable effort has been devoted to improved modeling of fracturing treatments so that improved expectations can be provided. Fracturing fluids have been modified to enhance cleanup. Proppant conductivity studies have lead to
R. Gdanski, J. Weaver, B. Slabaugh, H. Walters, M. Parker   +4 more
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Fracture and damage at a microstructural scale

Computing in Science & Engineering, 1999
Studying fracture surfaces of materials has been very useful in discriminating between different theoretical models. In the future, models and simulations should be able to help design suitable microstructures for tough materials. It is concluded that experiments in quantitative fractography perhaps have raised more questions than answers.
Elisabeth Bouchaud, Florin Paun
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On finite damage: ductile fracture-damage evolution

Mechanics of Materials, 1985
Abstract The tensorial entities pertaining to the presence of a damage zone within a representative material sample are obtained from the micro-macro transition of kinematic quantities in finite deformation. It is shown that they reduce to a ‘small-damage’ tensor as the finite deformation measures reduce to their common infinitesimal counterpart ...
A. Dragon, A. Chihab
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A cumulative damage model for bone fracture

Journal of Orthopaedic Research, 1985
AbstractA mathematical model is presented to describe the combined time‐dependent and cycle‐dependent fracture characteristics of devitalized cortical bone. Failure is interpreted based on a linear‐life fraction rule, which accounts for cumulative creep and fatigue damage under arbitrary loading histories.
D R, Carter, W E, Caler
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Sacrum fractures and neurological damage

Journal of Neurosurgery, 1977
✓ Two cases are presented in which automobile collision caused transverse sacral fracture involving neurological elements. The patients were admitted within 2 weeks of each other to the Maryland Institute for Emergency Medicine. An attempt was made to assess the incidence of this condition and its relation to fractured pelvis.
D P, Byrnes, G L, Russo, T B, Ducker, R A, Cowley   +3 more
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Creep Damage and Fracture

1982
The creep data obtained during C0ST50, round II, have been reanalyzed according to the recovery creep model modified for precipitation strengthening mechanisms. A good description of creep data is obtained in this way for all cases studied. A dislocation climb bypassing mechanism is indicated as beeing the governing process in service applications of ...
Y. Lindblom, G. Engberg
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Representation of Damage with Fracture-Strain

Applied Mechanics and Materials, 2014
Under the influence of stresses and strains damage is progressively accumulated in the material leading to full damage viz. fracture corresponding to a critical damage parameter. The damage parameter varies in between zero and unity inclusive of both the values corresponding to non damaged and fully damaged condition.
C.S. Surendran, G. Sasikala
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Damage and Fracture

2017
Micromechanical aspects, mechanisms and models of fracture are addressed, which have become increasingly topical since the 1990s though the basic ideas and perceptions date back to the early years of fracture mechanics. The characteristics of brittle and ductile damage on the micro-scale and the respective fractographic appearance are outlined and the ...
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