Theoretical and Experimental Study of Diffraction of ElasticWaves in Thick Plates
{'Code': '07030000', 'Directorate': {'Abbreviation': 'ENG', 'LongName': 'Directorate For Engineering'}, 'Division': {'Abbreviation': 'CMMI', 'LongName': 'Div Of Civil, Mechanical, & Manufact Inn'}}
{'SignBlockName': 'Jina Reed', 'PO_EMAI': None, 'PO_PHON': None}
This research performs a combined theoretical and experimental study of         diffraction of Lamb waves by two- and three-dimensional cracks in a             plate.  The results will provide the basis to develop techniques for            assessing the internal damage and cracks in solids.  The theoretical            study will use a hybrid finite element and modal expansion method.              Cracks in a homogeneous as well as in a welded plate will be                    considered.  A newly developed capacitive transducer will be used to            measure vertical surface displacements in a plate.  The measured                displacements will be compared with the theoretical predictions.  The           goal of this investigation is to analyze the dependence of the                  scattered signals on the dimension, angle of inclination, and depth of          burial of the crack.  The detailed analysis will be used to identify            characteristic features for crack sizing and location.
[{'FirstName': 'Hartmut', 'LastName': 'Spetzler', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Hartmut A Spetzler', 'EmailAddress': 'spetzler@spot.colorado.edu', 'NSF_ID': '000310141', 'StartDate': '09/01/1986', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Subhendu', 'LastName': 'Datta', 'PI_MID_INIT': 'K', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Subhendu K Datta', 'EmailAddress': 'dattas@spot.colorado.edu', 'NSF_ID': '000123862', 'StartDate': '09/01/1986', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
{'Name': 'University of Colorado at Boulder', 'CityName': 'Boulder', 'ZipCode': '803090001', 'PhoneNumber': '3034926221', 'StreetAddress': '3100 MARINE ST', 'StreetAddress2': 'STE 481 572 UCB', 'CountryName': 'United States', 'StateName': 'Colorado', 'StateCode': 'CO', 'CONGRESSDISTRICT': '02', 'CONGRESS_DISTRICT_ORG': 'CO02', 'ORG_UEI_NUM': 'SPVKK1RC2MZ3', 'ORG_LGL_BUS_NAME': 'THE REGENTS OF THE UNIVERSITY OF COLORADO', 'ORG_PRNT_UEI_NUM': None}
{'Name': None, 'CityName': None, 'StateCode': None, 'ZipCode': None, 'StreetAddress': None, 'CountryCode': None, 'CountryName': None, 'StateName': None, 'CountryFlag': None, 'CONGRESSDISTRICT': None, 'CONGRESS_DISTRICT_PERF': '""'}
[{'Code': '1441', 'Text': 'MECHANICS'}, {'Code': '9120', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}]
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1986&All=true', 'xml': '8609813.xml'}