Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 179 for “"stress field"”.
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Effects of Surface Irregularities on the Underground Stress Field
Made available in DSpace on 2014-12-10T17:57:49Z (GMT). No. of bitstreams: 1 6711927.pdf: 2925981 bytes, checksum: 54622b2dd5382eb8d9f6c8568df7ecca (MD5) Previous issue date: 1967
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Effects of geometry on compliant, stress field force sensor characteristics
… of multiple geometries for compliant, stress field (SF) force sensors. The goal of exploring these different sensor designs is to begin identification of the geometric properties of SF force sensors that are most optimal for certain loading conditions. This work prioritizes robotic …
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Damage accumulation in a gradient stress field in graphite/epoxy laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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Photoelastic stress analysis of crack propagation within a compressive stress field
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963.
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Strength characterization of wood to wood connections using stress field analysis
… This thesis analyzes wood to wood joints with stress fields. Stress field analyses may quickly and easily enable the design of timber joints and characterize the maximum loads they can handle. First, this thesis surveys and interconnects the theoretical concepts of wood behavior, plastic …
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The 3D in-situ stress field and its changes in geothermal reservoirs
Information on the contemporary in-situ stress state of the earth’s crust is essential for geotechnical applications and physics-based seismic hazard assessment. Yet, stress data records for a data point are incomplete and their availability is usually not dense enough to allow conclusive …
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Impact of Stress-field Changes Induced by Hydraulic Fracturing on Subsurface Fault Stability
… fracturing formations can change in-situ stresses in the surrounding areas. There are concerns that hydraulic fracturing may potentially reactivate the subsurface faults nearby the treatment wells. The reactivated faults could cause many problems, such as early aborting/failure of …
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The elastic stress field produced by a point force in a cubic crystal
… [equation] at 78. K Detailed calculations of stress fields have been made for aluminum and copper. It is noted that for Cu a contribution of additional terms besides that given by Eshe1by appears in the angular dependence of dilatation for the triple double force but for At the dilatation is …
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Towards Enhanced Earthquake Resilience: Linking Early Warning Systems, Ground Motion Prediction, and Stress Field Analysis
… behavior. The study also analyzes the local stress field in tectonically active regions to better understand earthquake dynamics and faulting patterns. Using data from focal mechanism catalogs, we investigate stress orientations and their role in earthquake triggering and fault reactivation. …
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A simplified method for the photoelastic determination of stress concentration factors in a tensile stress field
The stress concentration factors for rectangular slots with semicircular ends with their major axes inclined to the direction of a uniaxial tension field were investigated by photoelastic methods. A major portion of this thesis deals with the problem of loading a circular disk such as to create an …
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Cold Working Holes in Multi-Layer Members
… expansion. This method introduces a compressive stress field in the region around the hole that slows the propagation of cracks. Determining the life cycle benefits gained from cold expansion is difficult due to the complex nature of the residual stress field. Many groups have attempted to …
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Prediction of crack extension direction in unidirectional composites
… emphasis was placed on defining the crack tip stress field and finding a consistent criterion for predicting the direction of crack growth. Two models are presented to predict the crack tip stress field, an anisotropic elasticity solution and a singular isoparametric finite element formulation. …
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An experimental and numerical analysis of the exit flow in a slit die for polymer melts
… to evaluate the magnitude of the primary normal stress difference (N1) from the value of the exit pressure. Flow birefringence is used to directly assess the principal assumptions in the exit pressure theory and to evaluate the magnitude of Px from an expression derived from the macroscopic …
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Role of delamination and interlaminar fatigue in the failure of laminates with ply dropoffs
… dropoffs to better understand the interlaminar stress field and delamination/damage characteristics in such laminates, as well as the relationship between the two based on the strength of materials approach. To gain key insights into the mechanisms and structural parameters that cause …
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Bi-modal hemispherical sensors for three axis force and contact angle measurement
… MIT Biomimetic Robotics Laboratory to develop stress field based force sensors for use in robotic applications. The concept of stress field based force sensing consists of pressure sensors embedded within a rubber hemisphere.
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On Residual Stress in an Elastic Body
Residual stress is defined as the stress field supported by a body in the absence of external forces. Thus, the residual stress is in equilibrium with zero body force, is symmetric, and gives rise to zero surface traction.
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Machine Learning and Field Inversion approaches to Data-Driven Turbulence Modeling
… to provide improved closure for the Reynolds stress tensor field. The first approach uses machine learning to learn a general closure model from data. A novel framework is developed to train deep neural networks using experimental velocity and pressure measurements. The sensitivity of the RANS …
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ΕΠΙΔΡΑΣΗ ΤΗΣ ΠΑΡΟΥΣΙΑΣ ΡΩΓΜΩΝ ΣΤΗΝ ΚΑΤΑΝΟΜΗ ΤΗΣ ΕΝΤΑΣΕΩΣ ΣΕ ΘΛΙΒΟΜΕΝΑ ΣΩΜΑΤΑ. ΕΦΑΡΜΟΓΕΣ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΗΣ ΒΡΑΧΟΜΗΧΑΝΙΚΗΣ
THE CALCULATION OF THE STRESSES DEVELOPED ALONG THE CRACK FLANKS DUE TO COMPRESSION AND SHEARING IN THE FIRST TOPIC OF THIS THESIS . A CORRELATION MODEL HAS BEEN INTRODUCED IN ORDER TO CORRECT THE INCOMPATIBLE IN-PLANE DISPLACEMENTS, WHICH ARE PRODUCED BY THE SHEAR STRESSES. THE RESULT OF THIS …
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Rock fracture under static stress conditions
… of rock fracture, particularly under compressive stress conditions, is of fundamental importance. This thesis contains details of an investigation into the applicability of Griffith's brittle fracture theory, modified to account for the effects of crack closure in compression, to the prediction of …
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