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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

A laboratory simulation of adhesive wear of high speed reciprocating components in water powered mining equipment

Kienle, Ulrich F B January 1989 (has links)
Bibliography: pages 117-120. / A high-speed reciprocating sliding wear test rig was used to examine the metal on metal surface interactions of materials under consideration for application in water powered stoping equipment. The suitability of this test rig was investigated by implementing a test programme covering self-mated stainless steel and stainless steel-on-bronze couples. These couples were examined under water lubricated conditions in a broad test matrix, covering sinusoidal peak velocities of 1, 5 and 10 m/s; loads of 5, 10 and 20N and surface roughness values ranging from 0.2 to 0.4 μm, CLA. Due to poor reproducibility and inconclusive wear behaviours, no inferences could. be made as to the relative performance of the couples tested and no ranking tables could be compiled, In response to these findings, the emphasis changed to the design of a better test facility which could more accurately simulate the tribological interactions of interest. A new laboratory test rig, capable of investigating the performance of material surfaces, rubbing against one another under conditions of high speed reciprocating sliding in specific environments, was designed, built and commissioned. Subsequent tests conducted on this new facility showed average reproducibility for a 122 stainless steel rubbing against a CZ114 manganese bronze to have improved by a factor of two to approximately ± 20%. Initial results confirmed that adhesive wear is the dominant wear mode for the materials under consideration. This is manifested by homogeneous transfer layers and subsequent grooving of these layers.
12

Assessment of hole drilling procedures on resulting fatigue lives

Ralph, William Carter 01 December 2003 (has links)
No description available.
13

RELIABILITY ANALYSIS OF SERIES STRUCTURAL SYSTEMS (PROBABILITY, DESIGN, FATIGUE).

KJERENGTROEN, LIDVIN. January 1985 (has links)
Reliability analysis of series structural systems with emphasis on problems typical for metal fatigue is addressed. Specific goals include the following: (1) Given the distribution of strength of the components and the distribution of external loads on the system what is the probability of failure of the system? (2) Given the target safety index for the system, what would be the target safety index for the components? Exact solutions in the analysis of series structural systems only exists for some special problems. Some of these special problems are investigated. In particular some special cases of the problem of unequal element reliabilities are considered and some interesting observations are made. Numerical integration is in general required even when an exact solution exists. A correction or adjustment factor is developed for an important class of problems. This factor makes it possible to relate element and system probabilities of failure without numerical integration. However in most cases no exact solution to the structural series system problem exists. Approximations by for instance bounds on the probability of failure or Monte Carlo simulation has been the only way of approximating solutions. These two methods are generally not good approximation schemes since they are either too crude or too expensive. In this dissertation an approximation scheme for analysis of series systems where no exact solution exists is developed. The method only requires a simple numerical integration if the component safety index and the correlation coefficient between failure modes is known. Numerous examples are used to verify the method against known exact results and excellent estimates are obtained. Applications by practical examples is also given. In the appendix the problem of convergence of fatigue life distribution is also summarized.
14

The effect of temperature and intermittent cyclic loading on the fatigue properties of Ti-6A1-4V alloy

Brar, Amarjit Singh, 1939- January 1964 (has links)
No description available.
15

An investigation of the effect of surface finish on the flexure fatigue strength of 75S-T6 aluminum alloy sheet

Bodiford, Robert Graham 08 1900 (has links)
No description available.
16

Fatigue studies of 24S-T and 24S-T alclad sheet with various surface conditions

Bond, Aleck Constantine 05 1900 (has links)
No description available.
17

Frequency and mean stress effects in high cycle fatigue of Ti-6A1-4V

Morrissey, Ryan J. 12 1900 (has links)
No description available.
18

The characterization of small fatigue crack growth in PH13-8 Mo stainless steel

Jin, Ohchang 08 1900 (has links)
No description available.
19

USE OF THE FIELD-EMISSION MICROSCOPE IN THE DETECTION AND OBSERVATION OF SURFACE CRACKS IN METALS

Creighton, Donald Louis, 1932- January 1964 (has links)
No description available.
20

MECHANICAL ANALOGS OF NONLINEAR STRESS-STRAIN HYSTERESIS IN METALS

Honig, Ernest Martin, 1941- January 1973 (has links)
No description available.

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