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Acoustic Emission Evaluation and Mechanical Property Characterization of Stainless Steel Specimens Manufactured by Powder Based 3-D Printer

Rong, Yongsen (2015) Acoustic Emission Evaluation and Mechanical Property Characterization of Stainless Steel Specimens Manufactured by Powder Based 3-D Printer. Master's Thesis, University of Pittsburgh. (Unpublished)

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This research aims at establishing relationship between acoustic emission characteristics and mechanical properties of 3d-printed stainless steel specimens including 420 (SS 420) series and 316L (SS 316L) series. Acoustic emission (AE), one kind of nondestructive testing (NDT), is widely applied in structure health monitoring and crack detection during dynamic processes. Using AE method, it is possible to detect fracture events of a specimen during the whole process of mechanical testing.
Results of AE analysis accompanying tensile tests present similar AE properties but no distinct differences between the two series. In AE figures, there are notable characteristics which indicate yield point and break point for samples with high ductility, while the notable characteristics can only indicate break point for specimens with low ductility. Also, the cumulative AE hits tend to decrease with increasing porosity of samples. Mechanical properties of SS 420 and SS 316 specimens are far away from those of standard materials, which may be caused by low packing density during printing or insufficient sintering.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Rong, Yongsenyor4@pitt.eduYOR4
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorWang, Qing-mingQIW14@PITT.EDUQIW14
Committee ChairWang, Qing-mingQIW14@PITT.EDUQIW14
Committee MemberGarcia, C. Isaaccigarcia@pitt.eduCIGARCIA
Committee MemberNettleship, Iannettles@pitt.eduNETTLES
Date: 9 June 2015
Date Type: Publication
Defense Date: 1 April 2015
Approval Date: 9 June 2015
Submission Date: 3 April 2015
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 66
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Acoustic Emission Ealuation; Additive manufacture; Mechanical Property Characterization
Date Deposited: 09 Jun 2015 13:13
Last Modified: 15 Nov 2016 14:27


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