ASTM_D_7992_-_D_7992M_-_15.pdf

Designation:D7992/D7992M15Standard Practice forElevated Temperature and Moisture Conditioning ofPultruded Fiber Reinforced Polymer(FRP)Composites Usedin Structural Designs1This standard is issued under the fixed designation D7992/D7992M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 In general,it is feasible that the mechanical properties ofFRP composites will be affected by environmental conditionssuch as exposure to moisture at elevated temperatures.In orderto make reliable comparisons between different materials underelevated temperature and moisture environmental conditions,itis necessary to standardize the elevated temperature andmoisture conditions to which specimens of these materials aresubjected prior to and during testing.This practice definesprocedures for elevated temperature and moisture conditioningof pultruded FRP composites intended for use in structuraldesign applications.The conditioning medium representingelevated temperature and moisture exposure described in thisstandard practice is distilled water maintained at 37.8 6 1.5C(100 6 3F)for 1000 hours.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.1.3 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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD3918 Terminology Relating to Reinforced Plastic Pul-truded ProductsD6641/D6641M Test Method for Compressive Properties ofPolymer Matrix Composite Materials Using a CombinedLoading Compression(CLC)Test FixtureD7290 Practice for Evaluating Material Property Character-istic Values for Polymeric Composites for Civil Engineer-ing Structural ApplicationsD7745 Practice for Testing Pultruded Composites3.Terminology3.1 Definitions:3.1.1 standard laboratory temperature,na temperature of23 6 2C(73.4 6 3.6F)3.1.2 standard laboratory atmosphere,nan atmospherehaving a temperature of 23 6 2C(73.4 6 3.6F)and a rela-tive humidity of 50 6 10%.3.1.3 elevated temperature and moisture resistance,ntheability of a thermoset pultruded composite to withstand el-evated temperature and moisture exposure at 37.8 6 1.5C(100 6 3F)for 1000 hours.This ability will be quantified interms of the%retention of the mechanical property of interestas compared to samples held at standard laboratory atmo-sphere.3.2 Terminology relating to pultruded composites is foundin Terminology D3918.4.Significance and Use4.1 The elevated temperature and moisture conditioningprocedures prescribed in this practice are designed to providea standard procedure to be used to evaluate and compare theeffect of elevated temperature and moisture conditioning undercontrolled laboratory conditions on pultruded FRP compositesto be used in structural design applications.The conditioningprocedures prescribed in this practice are designed to obtainreproducible results to compare and evaluate these materialsbut are not intended to produce equilibrium conditions oractual service conditions for these materials.5.Sampling5.1 Sampling shall be in accordance with the locations fromwhich test specimens shall be taken from the reinforcedpultruded composites as defined in Practice D7745.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-ting Plastics.Current edition approved Sept.1,2015.Published October 2015.DOI:10.1520/D7992_D7992M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Sampling shall be in accordance with the ASTM testmethods for the specific mechanical properties to be deter-mined.36.Test Specimens6.1 The numbers and types of test specimens shall be inaccordance with the ASTM test methods for the specificmechanical properties to be determined.If Practice D7290 is tobe used to determine characteristic values for a particularmechanical property,at least ten samples are needed for thecontrol and ten samples are needed for the elevated tempera-ture and moisture conditioning for