Designation: E 2076 – 00Standard Te

Designation: E 2076 – 00Standard Test Method forExamination of Fiberglass Reinforced Plastic Fan BladesUsing Acoustic Emission1This standard is issued under the fixed designation E 2076; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method provides guidelines for acoustic emission(AE) examinations of fiberglass reinforced plastic (FRP)fan blades of the type used in industrial cooling towers and heatexchangers.1.2 This test method uses simulated service loading todetermine structural integrity.1.3 This test method will detect sources of acoustic emissionin areas of sensor coverage that are stressed during thecourse of the examination.1.4 This test method applies to examinations of new andin-service fan blades.1.5 This test method is limited to fan blades of FRPconstruction, with length (hub centerline to tip) of less than 10ft, and with fiberglass content greater than 15 % by weight.1.6 AE measurements are used to detect emission sources.Other nondestructive examination (NDE) methods may beused to evaluate the significance of AE sources. Procedures forother NDE methods are beyond the scope of this test method.1.7 Values stated in inch-pound units are to be regarded asthe standard. SI units given in parentheses are provided forinformation only.1.8 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appropriatesafety and health practices and determine the applicabilityof regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:E 543 Practice for Agencies Performing NondestructiveTesting2E 650 Guide for Mounting Piezoelectric Acoustic EmissionSensors2E 750 Practice for Characterizing Acoustic Emission Instrumentation2E 976 Guide for Determining the Reproducibility of AcousticEmission Sensor Response2E 1067 Practice for Acoustic Emission Examination ofFiberglass Reinforced Plastic Resin (FRP) Tanks/Vessels2E 1106 Method for Primary Calibration of Acoustic EmissionSensors2E 1316 Terminology for Nondestructive Examinations22.2 ASNT Documents:SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel Qualification and Certification3ANSI/ASNT CP-189 Standard for Qualification and Certificationof Nondestructive Testing Personnel32.3 Military Standards:MIL-STD-410 Nondestructive Testing Personnel Qualificationand Certification42.4 Aerospace Industries Association Document:NAS 410 Certification and Qualification of NondestructiveTesting Personnel53. Terminology3.1 Definitions—For definitions of terms used in this testmethod, see Terminology E 1316.4. Summary of Test Method4.1 This test method consists of subjecting individual FRPfan blades to increasing load while monitoring with sensorsthat are sensitive to acoustic emission (transient stress waves)caused by growing flaws.4.2 This test method provides guidelines to determine thezonal location of structural flaws in FRP fan blades.4.3 The test load, applied at the blade tip is calculated toprovide 100 % of the maximum allowable operating (bending)load at the blade-hub interface.4.4 This test method is intended to simulate the bendingload. Torsional and centrifugal loads are not simulated by thistest method.4.5 Structurally insignificant flaws may produce acousticemission