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 1570 for “"Crack"”.
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Fatigue Crack Closure and Crack Growth Outside the Small Scale Yielding Regime
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988.
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Crack coalescence in granite
This thesis experimentally investigates crack coalescence in prismatic Barre Granite specimens with two pre-cut, open flaws under uniaxial compression. Using a high-speed video system, crack initiation, propagation, and coalescence are observed. Flaw geometries are chosen to allow one to compare …
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Micromechanics of Hydrogen-Induced Crack Initiation in Pipeline Steels and Subcritical Crack Growth
… on ductile fracture, we model sustained-load cracking in the iron-base superalloy 1N903 at hydrogen pressures at which fracture is governed by plasticity. Through a micromechanics analysis, we quantify the void growth dependence on stress triaxiality and hydrogen-induced material softening as …
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Crack propagation in isotropic materials
This thesis presents a numerical study of crack propagation in brittle materials. The finite element method using constant strain triangular elements was used. The experimental investigation is based on Gurney and Hunt's quasi-static method of fracture testing.<br/><br/>The applicability of the …
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The Crack in the Mountain
No Abstract.
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Fractographic investigation of crack-closure.
Thesis: M.S., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1978
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Fatigue crack initiation in weldments
Thesis (Ocean. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Crack Detection in Aluminum Structures
… The first is to experimentally validate a crack model and to see how small of a crack can be detected by vibration methods. The second is to use the concept of stress intensity factor to perform an SHM type of measurement to determine the remaining life of a structure once the impedance …
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Crack as a moral panic: The racial implications inherent to crack and powder cocaine sentencing
… and extent of the print media's coverage of crack cocaine to determine whether a moral panic ensued during the late 1980's. A content analysis was conducted on the Los Angeles Times from 1985 to 1990, examining both the nature and extent of the Los Angeles Times' coverage of crack cocaine as …
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Experimental determination of stress intensities and crack shapes associated with the nozzle corner crack problem
… has been applied to a phase of the nozzle corner crack problem yielding results in the form of crack shapes and stress intensity factor distributions. Results of the current study are compared with alternate methods and different phases of the same problem. A discussion of the variational material …
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High resolution fatigue crack growth analysis of crack closure and slip irreversibility using digital image correlation
Crack closure and slip irreversibility in the fatigue crack growth of 316L stainless steel were investigated using digital image correlation (DIC). A polycrystalline and a oriented specimen were tested to study mode I fatigue crack growth, while oriented specimens were used to study mixed mode (I …
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Crack growth resistance in nuclear graphite
R-curve behaviour is often used for evaluating crack growth resistance in quasibrittle materials but few studies have focused on polycrystalline graphite. In this study, R-curve behaviour in three commercial grade nuclear graphites, of varying structure and properties, is compared using an optical …
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Crack initiation and propagation in rock.
Thesis (Civ. E.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1968.
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Subcritical crack growth in polysilicon MEMS
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Subcritical crack growth in zirconium alloys
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Evaluation of susceptibility of AISI 304 to stress-corrosion cracking in terms of crack nucleation and crack propagation
… susceptibility of AISI 304 to stress-corrosion cracking in terms of time to crack nucleation and rate of crack propagation. U-bend specimens were exposed to magnesium chloride solutions boiling at atmospheric pressure for some predetermined time. The concentrations of magnesium chloride employed …
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Fatigue crack propagation in functionally graded materials
Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step …
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Heavy-Tailed Crack Distribution Families and Applications
… thesis, we consider a new class of heavy-tailed crack distribution families as an extension of the three-parameter Gaussian crack distribution (Volodin and Dzhungurova, 2000) of which the right tail lacks exibility to t heavy-tailed observations. Several key distributional properties of the …
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Point Estimation of Three Parameter Crack Distribution
The three parameter Crack distribution is a mixture of the two parameter Inverse Gaussian distribution and Length Biased Inverse Gaussian distribution and Birnbaum-Saunders distribution is a special case for p = 1 2 ; where 0 p 1, is the weight parameter. In this thesis, we have developed and …
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Crack Healing in Polymers (Fracture, Reptation, Tack)
The mechanical property development associated with the healing of polymer-polymer interfaces was studied using theoretical and experimental approaches. The healing of crazes in atactic polystyrene (PS) and microvoids in styrene-isoprene-styrene block copolymers was described phenomenologically, …
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