Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads /
(4.5 x 0.4 in.) to 114.3 x 114.3 mm (4.5 x 4.5 in.). AU
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (4.5 x 0.4 in.) to 114.3 x 114.3 mm (4.5 x 4.5 in.). AU (80,000 psi) were obtained from the beryllium plate acceleration level required to fail the specimen at actual failure stress. amplitude is increased from zero to a target maximum within a and verify a numerical method for prediction of failure for are predicted to within an average of seven percent of the aretested to failure. Energy is imparted to each plate in at NASA Johnson Space Center. As a precursor to experiments attached to the plate and a point on the excitation fixture, beryllium SR200 sheet material are incorporated into a clamped by a specially designed fixture at the center of the commercial finite element code by means of a specially continuously increased until the specimen fails; the cross-rolled beryllium sheet structures that are subjected to decrease its natural frequency, and thereby reduce the experiments and numerical simulations are carried out on experiments. These stresses compare well with stresses failure envelope is made at each incremental load. Failure failure models for regular annealed glass and cross-rolled failure models, the primary failure stresses for each plate Frequencies of excitation ranged from 71 Hz to 96 Hz. Tsai-Wu glass and beryllium plates. A-total of five glass and glass plates, 2.54-mm (0.1-in.) thick beryllium specimens glass specimens were approximately 2.24 nun (0.088 in.) in is predicted to occur when the state of stress at one or more is used to obtain time-history data from transducers attached length to form a double cantilever. Effective length and mm (4.5 x 1.0 in.) to 114.3 x 114.3 mm (4.5 x 4.5 in.). model. A comparison between stress at a point and the nine beryllium specimens with various length-to-width ratios obtained by other investigators using static loads. By of three in-plane components of stress is compared with the period of 15 seconds. A high-speed data acquisition system points in the material exceeds those stresses that satisfy resonance. Three sets of specimens (each set consisting of respectively. Laboratory tests were conducted at the Specimen length and width dimensions vary from I 1 4.3 x 25.4 specimens is brittle. Numerical models show good agreement specimens were also tested to gain additional information. steel mass was added to the end of each plate in order to stress level at each integration point in the finite element support. Tensile failure stresses of approximately 551,6 Mpa table. Amplitude of excitation at the resonant frequency is the failure criterion. Because each specimen was excited at the first fundamental mode, maximum stresses occurred at the the form of sinusoidal base excitationby means of a shaker the laboratory and numerically simulated. These plates were The principal objective of this investigation is to develop thickness. In contrast to the structural symmetry of the three equal size plates) were excited to failure. Two other to each specimen. Strain gages and an accelerometer are vibration loads. To this end, complementary laboratory Vibrations and Control Laboratory of Texas A&M University and visual inspection, it is determined that the failure of all were clamped only at one end to form a single cantilever. A width dimensions of each specimen vary from 114.3 x 10.0 min with beryllium, a series of glass specimens were tested in with experimentally measured quantities. Using the developed written subroutine. A failure criterion that is a function |
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| Item Description: | "Major subject: Civil Engineering". Vita. |
| Physical Description: | xv, 154 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |