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Development of a Closed-loop Resonant Fatigue Testing Methodology and Experimental Life Test of Aluminum Alloy

Abdullah, A.B.M.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1289328504

Abstract Details

2010, Master of Science, University of Akron, Civil Engineering.
A vibration-based testing methodology is presented that assesses fatigue behavior of material for metallic structure. To minimize the testing duration, the test setup is designed for a base-excited multiple-specimen arrangement driven in a high-frequency resonant mode, which allows completion of fatigue testing in an accelerated period. A high performance electro-dynamic exciter (shaker) is used to generate harmonic oscillation of cantilever beam specimens, which are clasped on the shaker armature with specially-designed clamp fixtures. The shaker operates in closed-loop control with dynamic specimen response feedback provided by a scanning laser vibrometer. A test coordinator function is developed to synchronize the shaker controller and the laser vibrometer, and to complete the closed-loop scheme: the test coordinator monitors structural health of the test specimens throughout the test period, recognizes change in specimen dynamic behavior due to fatigue crack initiation, terminates test progression, and acquires test data in an orderly manner. Topological design is completed by constructing an analytical model and performing finite element analysis for the specimen and fixture geometry such that peak stress does not occur at the clamping fixture attachment points. Experimental stress evaluation is conducted to verify the specimen stress predictions. A successful application of the experimental methodology is demonstrated by validation tests with aluminum specimens subjected to fully-reversed bending stress.
Gun Jin Yun, Dr. (Advisor)
Craig C. Menzemer, Dr. (Committee Member)
Wieslaw K. Binienda, Dr. (Committee Member)
135 p.
Engineering
High-cycle fatigue; Vibration-based testing; Scanning laser vibrometer; Shaker controller; Closed-loop testing; Bending fatigue; Experimental fatigue testing; Resonant fatigue

Recommended Citations

Citations

  • Abdullah, A.B.M. (2010). Development of a Closed-loop Resonant Fatigue Testing Methodology and Experimental Life Test of Aluminum Alloy [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1289328504

    APA Style (7th edition)

  • Abdullah, A.B.M.. Development of a Closed-loop Resonant Fatigue Testing Methodology and Experimental Life Test of Aluminum Alloy. 2010. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1289328504.

    MLA Style (8th edition)

  • Abdullah, A.B.M.. "Development of a Closed-loop Resonant Fatigue Testing Methodology and Experimental Life Test of Aluminum Alloy." Master's thesis, University of Akron, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1289328504

    Chicago Manual of Style (17th edition)

akron1289328504
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© 2010, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.