Elastic-Plastic deformation studies in 4140 steel using the critically refracted longitudinal (Lcr)wave technique /
2.25MHz and 5MHz. Although slightly different acoustoelastic
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| Format: | Thesis eBook |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 2.25MHz and 5MHz. Although slightly different acoustoelastic approached. It is applicable even in a passed yield region. below the elastic limit is on, it is also capable of by only 2︢ ns, (0.026% of total travel time). When the load can not only predict the applied stress level when a load constants were obtained for both 2.25 MHz and 5 MHz frequencies in the elastic region (up to 80% of the yield in predicting the acoustoelastic constant. The I MHz In the elastic-plastic region, a simple quadratic indicating prior yielding, in terms of residual strain, when interesting results. When an applied load was below the material in the elastic-plastic region. Both applied tensile of 4140 steel, typically used for turbine components, was passed the yield point, the "return to no-load" LCR travel- probe sets of three different nominal frequencies, IMHZ, procedure was found not to be adequate for the plate type relationship between the LCR travel time and the residual residual strain. After load release, a 12.8% residual strain resulted in a 15 ns (0.198% of total travel time) change in specimen using a 5 MHz probe set provided some very strain may replace the linear correlation between the LCR strength), statistically both have no significant difference stress and residual strain effects are discussed. A sample stress-strain behavior until the yield stress level is structure. Data obtained in post yield tests on the same technique has been used to investigate a typical turbine disk tested. The acoustoelastic phenomenon was evaluated using the "no-load" travel time. The test results indicate that the component has been worked in an elastic-plastic region. The critically refracted longitudinal (LCR) wave ultrasonic The LCR travel time, or the relative change on LCR velocity, the LCR ultrasonic technique can linearly track the material time showed a distinct change, due to the occurrence of velocity and applied stress in the elastic limit. yield point, the "return to no-load" LCR travel time varies |
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| Item Description: | "Major subject: Mechanical Engineering". Vita. |
| Physical Description: | xii, 94 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references: 71-73. |