The Effect of Notch Constraint on Low-Cycle Fatigue
{'Code': '07030000', 'Directorate': {'Abbreviation': 'ENG', 'LongName': 'Directorate For Engineering'}, 'Division': {'Abbreviation': 'CMMI', 'LongName': 'Div Of Civil, Mechanical, & Manufact Inn'}}
{'SignBlockName': 'Devendra P. Garg', 'PO_EMAI': None, 'PO_PHON': None}
Modern technology requires that certain mechanical components (in air-          breathing jet engines or nuclear reactors, for example) be subjected to         a limited number of cycles at very high loading.  Failures in these             components begin at stress concentrations; however, very little is              known about the effects of the constraint of the surrounding material           on localized low-cycle fatigue.  The objective of this research is to           use a novel, realtime, interferometric strain measuring technique to            begin to fill this gap.  Strain will be measured over a very short              gauge length at the root of stress concentrations for a variety of              materials and loading conditions.  The research will:  evaluate the             effect of constraints on the cyclic Neuber relation which is currently          used in design of mechanical components; provide design guidance, on an         empirical basis, which will permit a more intelligent estimate of the           effects of the local stress/strain state on low-cycle fatigue; generate         previously unobtainable data which will be valuable to those evaluating         or developing theories for predicting localized cyclic behavior.
{'FirstName': 'William', 'LastName': 'Sharpe', 'PI_MID_INIT': 'N', 'PI_SUFX_NAME': 'Jr.', 'PI_FULL_NAME': 'William N Sharpe', 'EmailAddress': 'sharpe@jhu.edu', 'NSF_ID': '000249195', 'StartDate': '06/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Johns Hopkins University', 'CityName': 'BALTIMORE', 'ZipCode': '212182608', 'PhoneNumber': '4439971898', 'StreetAddress': '3400 N CHARLES ST', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Maryland', 'StateCode': 'MD', 'CONGRESSDISTRICT': '07', 'CONGRESS_DISTRICT_ORG': 'MD07', 'ORG_UEI_NUM': 'FTMTDMBR29C7', 'ORG_LGL_BUS_NAME': 'THE JOHNS HOPKINS UNIVERSITY', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '1441', 'Text': 'MECHANICS'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8702110.xml'}