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Showing 1 to 20 of 262 for “"Residual Stress"”.
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A Novel Approach to Residual Stress Measurement
<p> Residual stress is a topic of ever increasing concern in many industries and aspects of engineering. Existing methodologies for quantifying residual stresses have been proven effective, all with their respective drawbacks. This thesis provides an authentication of a novel strain measurement and …
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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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Residual stress evaluation of aluminium drill rods
… of an air abrasive centre hole (AACH) residual stress measuring facility as well as its use in an experimental study of residual stresses developed in extruded high strength aluminium drill rods. These drill rods were manufactured by Hulett Aluminium for the mining industry for surface …
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Residual stress in nanocrystalline nickel tungsten electrodeposits
Characterizing the residual stress of thick nanocrystalline electrodeposits poses several unique challenges due to their fine grain structure, thickness distribution, and matte surface. We employ a three-dimensional profilometry-based approach that addresses each of these complicating factors and …
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Mobile neutron sources for residual stress measurement
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Residual stress measurement in railroad car wheels
… is based on the fluctuations of the azimuthal residual stress in the tread of the wheel. This criterion is based on a maximum likelihood statistical analysis of data obtained from six different wheels as deterrmined by x-ray diffraction. Of these locations, the analysis showed the tread, and …
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Modeling of Residual Stress in Thick Section Weldments
Welding processes produce residual stresses and distortion as a result of the large nonlinear thermal loading created by the arc. Cracking and lamellar tearing have been experienced just after welding and later during the intended service life. Particularly, tensile residual stresses in regions …
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Residual stress in Pt coatings under thermal influence
… above room temperature were investigated for residual stress using the non-destructive X-ray diffraction technique. The apparatus used for the investigation was a Ψ-goniometer with a scintillation detector. The measured data were analysed with "sin²Ψ"-method. The total stress yielded was found …
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Metallurgical characterization and residual stress measurements of target structural materials
… investigation is focused on the evaluation of residual stresses in target structural materials due to plastic deformation and welding by using both destructive ring-core (RC) method and nondestructive techniques including positron annihilation spectroscopy (PAS), neutron diffraction (ND) and …
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Controlling plasticity in the contour method of residual stress measurement
… method has emerged as a promising technique for residual stress measurement in relatively large, thick and complex engineering components. The method involves making a cut in the sample of interest, measuring the subsequent relaxed deformation profile of the cut surface and using this profile to …
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Investigation of Residual Stress In Friction Stir Welded Aluminum Alloys
… and numerical modeling with an emphasis on residual stresses induced by processing. Thermal conditions and weld parameters are varied and resulting weld properties are correlated to deduce trends. In one study on thin plate 6.35 mm AA7050, thermal boundary conditions are manipulated within a …
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Energy theorems and bounds in linearized elasticity with residual stress
Residual stress is the stress present in a fixed reference placement in which the body is at rest in the absence of external forces. In this work, residual stress is viewed as constitutive information so as to develop nondestructive mechanical tests that provide information about the residual …
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Process optimization of plastic injection molding for minimal residual stress
… bore radius by over fifty percent. The thesis stresses the use of a team approach and the application of analytical methods to better understand the process. The report also includes a brief discussion of the use of Computer Aided Engineering (CAE) techniques to improve the product development …
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Residual stress measurements and analysis by destructive and non-destructive techniques
… investigation is focused on the evaluation of residual stresses resulting from cold deformation and welding in candidate target structural materials such as martensitic Alloys EP-823 and HT-9, and austenitic Type 304L stainless steel (SS). Measurements of residual stresses were performed by …
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Processing Effects for Integrated PZT: Residual Stress, Thickness, and Dielectric Properties
… anomaly at high temperatures. Instead, a stress-induced distributed phase transformation related to the polycrystalline nature of the film was proposed to account for the observed behavior. Residual stress reduced the spontaneous polarization values in these specimens to 32muC/cm 2 from …
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Influence of Geometry and Residual Stress on Fatigue of Welded Joints
Made available in DSpace on 2014-12-08T23:56:30Z (GMT). No. of bitstreams: 1 6604284.pdf: 3587109 bytes, checksum: dad2f07f4ce48b7409434c69f079d278 (MD5) Previous issue date: 1965
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Process-induced viscoelastic residual stress analysis of graphite/epoxy composite structures
… fiber-reinforced composites on process-induced residual stresses was investigated. The material selected for study was AS4/3501-6, a commercial prepreg system manufactured by Hercules, Inc. To investigate the cure-dependent viscoelastic behavior, a series of stress relaxation tests was performed …
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Microstructure and residual stress in hydrogenated amorphous silicon (a-Si:H) layers
… of the scattered intensity. Indication of the residual stress in the layers was obtained using the conventional sin²ψ method, normally used and especially developed for polycrystalline materials, but here applied to an amorphous structure. It is found that residual stress and microstructure of …
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Crack Initiation Analysis in Residual Stress Zones with Finite Element Methods
… area of the analysis of fracture mechanics in residual stress zones. This type of research has become more prevalent in the field in recent years due to the increase in prominence of residual stress producing processes. Such processes include additive manufacturing of metals and installation …
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