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 543 for “"Ductile"”.
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Effects of prior ductile tearing on cleavage fracture in the ductile-to-brittle transition region
… effect of specimen size, a/W ratio and prior ductile tearing on cleavage fracture toughness values ($J\sb{c}$) measured in the ductile-to-brittle transition region of ferritic materials. In the lower-transition region, cleavage fracture often occurs under conditions of large-scale yielding but …
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The Ductile to Brittle Transition in Polycarbonate
… and rate-dependent in order to simulate the ductile to brittle failure transition in polycarbonate. The cohesive zone model is motivated by experimental evidence that two different critical energies per unit area of crack growth exist in glassy polymers. A higher energy state is associated …
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Elastic-Damaging Plasticity Model for Ductile Fracture
… of a simple material model that can characterize ductile fracture in ferritic steels and that can be used in practical engineering problems. Ductile fracture occurs by a sequential process of nucleation, growth and coalescence of microvoids or microcracks. However, the model uses a continuum …
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Reliability Analysis of Redundant Ductile Structural Systems
… point estimate of the collapse probability of ductile structural systems, particularly, plastic frameworks and trusses.
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Failure Analysis of Microflawed Ductile Matrix Materials
Made available in DSpace on 2014-12-12T00:25:56Z (GMT). No. of bitstreams: 1 7500305.pdf: 3802650 bytes, checksum: 876c0349fb28ea10d2c8184d230f6001 (MD5) Previous issue date: 1974
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Ductile fracture by the growth of pores
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1961.
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A study of plane strain ductile fracture.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1971.
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Scale effects in microindentation of ductile crystals
Indentation testing has long been a standard test used to classify all types of materials. In the past several decades the scale of indentation testing has moved into the micron and even sub-micron range. For many types of materials, at these small length scales, the hardness of the material …
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Failure mechanisms in impact erosion of ductile materials
Solid particle erosion in ductile materials is a common problem in many industrial applications. It is defined as material loss resulting from the mechanical contact between the particle and the metal surface. Many experimental studies were reported in the past to determine the loss of the material …
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Solid-state diffusion bonds using ductile, reactive multilayers
Includes bibliographical references (pages 168-174).
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Studies on the Brittle -Ductile Transition in Silicon
After a specimen geometry that ensures straight crack growth was found for the experiment described above, research on crack turning was continued. As a hot glass plate is dipped into cool water, a pre-crack may grow along many different paths depending upon the testing parameters. In silicon the …
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Steady crack growth through ductile metals: Computational studies
… the crack-front response during sustained ductile tearing in structural metals at quasi-static rates using high resolution finite element computations. At load levels approaching the steady-growth regime, well-established computational methods that model material damage break down …
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Ductile fracture and structural integrity of pipelines & risers
The Oil and Gas (O&G) industry has recently turned its interest towards deep and ultra-deep offshore installations in order to address the global increase of energy demand. Pipelines and risers are key components for the production and transportation of oil and gas both in the offshore and onshore …
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Deep penetration into frictional ductile and brittle materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1992.
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Prediction of ductile crack formation in uncracked bodies
… present thesis is the process of formation of ductile cracks, which may be responsible for a catastrophic structural failure. Experimental, numerical and analytical studies are carried out on the prediction of ductile crack formation in uncracked bodies on an example of 2024-T351 aluminum …
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A study of anisotropic and viscoelastic ductile fracture
The problem of ductile fracture in anisotropic and viscoelastic solids is an important engineering problem. In this paper the Dugdale model is assumed, that is, the yielded zone is replaced by a constant yield stress. Solutions are presented for anisotropic static, orthotropic dynamic and …
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