Synchronization and Triggering: From Fracture to Earthquake Processes
Author: Valerio de Rubeis, Zbigniew Czechowski and Roman Teisseyre | Size: 7,4 MB | Format:PDF | Publisher: Springer | Year: 2010 | pages: 381 | ISBN: 9783642122996
This monograph contains experimental and theoretical considerations on synchronization and triggering in laboratory fracture experiments and in earthquake processes. Non-linear dynamics and the physics of rotational motions reveal such ordering in geophysical processes and observed time series. Presented experiments with electromagnetic and mechanical forcing show synchronization of the slip instabilities observed as acoustic burst emissions. New observational results, based on a net of broadband seismic stations, indicate the hidden periodicities and multiple coherence effects in the low frequency microseismic oscillations observed tens of hours before the earthquakes. These results are supported by observational evidence on synchronization between shear oscillations and rotation motions in microseismic fields before earthquakes occur.
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The book presents the principles of Damage Mechanics along with the latest research findings. Both isotropic and anisotropic damage mechanisms are presented. Various damage models are presented coupled with elastic and elasto-plastic behavior. The book includes two chapters that are solely dedicated to experimental investigations conducted by the authors. In its last chapter, the book presents experimental data for damage in composite materials that appear in the literature for the first time.
Chapter 1. Introduction
Part I: Isotropic Damage Mechanics - Scalar Formulation
Chapter 2. Uniaxial Tension in Metals
Chapter 3. Uniaxial Tension in Elastic Metal Matric Composites
Chapter 4. Uniaxial Tension in Elasto-Plastic Metal Matric Composites: Vector Formulation of the Overall Approach
Part II: Anisotropic Damage Mechanics - Tensor Formulation
Chapter 5. Damage and Elasticity in Metals
Chapter 6. Damage and Plasticity in Metals
Chapter 7. Metal Matrix Composites - Overall Approach
Chapter 8. Metal Matrix Composites - Local Approach
Chapter 9. Equivalence of the Overall and Local Approaches
Chapter 10. Metal Matrix Composites - Local and Interfacial Damage
Chapter 11. Symmetrization of the Effective Stress Tensor
Chapter 12. Experimental Damage Investigation
Chapter 13. High Cyclic Fatigue Damage for Uni-Directional Metal Matrix Composites
Chapter 14. Anisotropic Cyclic Damage-Plasticity Models for Metal Matrix Composites
Part III: Advanced Topics in Damage Mechanics
Chapter 15. Damage in Metal Matrix Composites Using the Generalized Model Cells
Chapter 16. The Kinematics of Damage for Finite-Strain Elasto-Plastic Solids
Chapter 17. A Coupled Anisotropic Damage Model for the Inelastic Response of Composite Materials
Part IV: Damage Mechanics and Fabric Tensors
Chapter 18. Damage Mechanics and Fabric Tensors
Chapter 19. Continuum Approach to Damage Mechanics of Composite Materials with Fabric Tensors
Chapter 20. Micromechanical Approach to Damage Mechanics of Composite Materials with Fabric Tensors
Chapter 21. Experimental Study and Fabric Tensor Quantification of Micro-Crack Distributions in Composite Materials
Audience:
Researchers in Engineering, Mechanics, Mechanical Engineering, Civil Engineering and Materials Science. Also suitable for Graduate Students in Engineering Mechanics, Mechanical Engineering, Civil Engineering and Materials Science.
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Using the Dynamic Cone Penetrometer and Light Weight Deflectometer for Construction Quality Assurance
Author: John Siekmeier ; Cassandra Pinta; Scott Merth; Julie Jensen ;Peter Davich; Felipe Camargo; Matthew Beyer | Size: 7.3 MB | Format:PDF | Publisher: Minnesota Department of Transportation Research Services Section 395 John Ireland Boulevard, MS 330 St. Paul, Minnesota 55155-1899 | Year: 2009 | pages: 244 | ISBN: --
The final products resulting from this research implementation project are the specification target values for both granular materials and fine grained soils. For compacted granular material, the grading number and field moisture content are used to select the appropriate DCP and LWD target value. A sieve analysis is used to determine the grading number and an oven dry test or reagent test is typically performed to determine the field moisture content. For compacted fine grained soil, the plastic limit and field moisture content are used to determine DCP and LWD target values. In this case, the plastic limit is used rather than the grading number to classify the soil and is also used to estimate the optimum moisture content for compaction. In addition to these target values, this report provides further standardization of the testing procedures for both the LWD and DCP. This will ensure greater uniformity by personnel conducting these tests. Currently, the method for obtaining a DPI value is varied, involving different numbers of seating drops and measurement drops. Using three seating drops and five to ten measurement drops, depending on the material type, is recommended in this report. LWD testing includes variations as well and the Mn/DOT Grading and Base section is currently defining the seating depth and other aspects of the procedure for implementation during the 2009 construction season. The LWD device is currently non-standardized nationally, allowing manufacturers to develop different models, which produce different measurements. Because Mn/DOT has decided to establish predetermined target values it is necessary to select a specific LWD such that the buffer and plate stiffnesses are also constant along with the specified falling mass, peak force, and plate diameter.
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Posted by: utan - 11-26-2010, 11:16 AM - Forum: Famous Projects
- No Replies
Leaning Tower of Pisa: Behaviour after Stabilization Operations
Author: John B. Burland,Michele B. Jamiolkowski and Carlo Viggiani | Size: 2.5 MB | Format:PDF | Publisher: International Journal of Geoengineering | Year: 2009 | pages: 14
It is well known that the foundations of the Leaning Tower of Pisa were stabilised using the method of
underexcavation to reduce the southward inclination of the Tower by about 10 percent in combination with controlling the
seasonally fluctuating water table beneath the north side. Having been closed to the public since early in 1990, the Tower
was re-opened in December 2001. The paper summarises the response of the Tower during the period of implementation of
the stabilisation works. Monitoring of the movements of the Tower has been continuing and the observations obtained since
2001 are presented. It is shown that over the six years between 2003 and 2008 the induced rate of northward rotation of the
Tower has been steadily reducing to less than 0.2 arc seconds per year. Similarly the rate of induced settlement of the
centre of the foundation has been steadily reducing and is approaching the background rate of settlement of the Piazza.
Piezometer measurements close to the north side of the foundation shows that the drainage system has been successful in
stabilising the groundwater levels beneath the north side of the Tower’s foundation. The paper concludes with a brief
discussion on the possible future behaviour of the Tower.
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Author: Ove Ditlevsen, H. O. Madsen | Size: 3 MB | Format:PDF | Publisher: First edition published by John Wiley & Sons Ltd, Chichester | Year: 2007 | pages: 370
Product Description
This book addresses probabilistic methods for the evaluation of structural reliability, including the theoretical basis of these methods. Partial safety factor codes under current practice are briefly introduced and discussed. A probabilistic code format for obtaining a formal reliability evaluation system that catches the most essential features of the nature of the uncertainties and their interplay is then gradually developed. The concepts presented are illustrated by numerous examples throughout the text. The modular approach of the book allows the reader to navigate through the different stages of the methods.
Language Notes
Text: English (translation)
Original Language: Danish
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