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GB/T 41049-2021: Test method for flexural properties of fibre metal laminates Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 41049-2021: Test method for flexural properties of fibre metal laminates---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT41049-2021NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.150.10 CCS Y 80 Test method for flexural properties of fibre metal laminates ISSUED ON: DECEMBER 31, 2021 IMPLEMENTED ON: JULY 1, 2022 Issued by: State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Test principle ... 5 5 Test equipment ... 6 6 Samples ... 7 7 State regulation ... 8 8 Test procedures ... 8 9 Calculation and result presentation ... 10 10 Test report... 13 Test method for flexural properties of fibre metal laminates1 ScopeThis document specifies the test principle, test equipment, sample, state regulation, test procedure, calculation and result presentation, and test report of the test method for flexural properties of fibre metal laminates. This document applies to the determination of three-point flexural strength, flexural modulus, flexural stress, and load-deflection curves of fibre metal laminates undergoing bending failure.2 Normative referencesThe following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document. GB/T 1446-2005 Fiber-reinforced plastics composites - The generals for determination of properties GB/T 2918 Plastics - Standard atmospheres for conditioning and testing GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values JJG 139 Verification regulation of Tension, Compression and Universal Testing Machines3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 fibre metal laminates; FMLs It is an interlayer hybrid composite material formed by alternately laying metal sheets (aluminum alloy, titanium alloy, etc.) and fibre (glass fibre, carbon fibre, aramid fibre, etc.) composite materials under a certain temperature and pressure. 3.2 flexural stress Bending moment regularization. Note 1: The stress of the outer surface layer of the sample when it is assumed that the stress caused by bending deformation is linearly distributed. Note 2: The unit is megapascal (MPa). 3.3 flexural strength Under bending failure, the flexural stress of the specimen when the damage load or the maximum load is reached. Note: The unit is megapascal (MPa). 3.4 span The distance between the central axes of the two supports on the testing machine. Note: The unit is millimeter (mm). 3.5 deflection The maximum height difference between the normal line of the deformation position of the sample surface during bending and the initial position. Note: The unit is millimeter (mm). 3.6 flexural strain The rate of change in length of the outer surface layer of the sample at the midpoint of the span, expressed as a percentage. 3.7 flexural modulus The value derived from the slope of the initial section on a bending stress-bending strain curve or bending load-deflection curve. Note: The unit is megapascal (MPa).4 Test principleWith unconstrained support, the sample is destroyed at a constant loading rate by three- point bending. Throughout the process, measure the load applied to the sample and the deflection or bending strain of the sample to determine the flexural strength, flexural modulus, and the relationship between flexural stress and flexural strain. Note 3: The data obtained from tests under different span-to-thickness ratios cannot be compared. 8.4 Sample installation Mark the tension surface of the sample, and place the sample symmetrically on the two supports. If necessary, place a thin sheet or a thin spacer between the upper surface of the sample and the loading indenter to prevent the sample from failing under pressure. When using strain gauges, stick the strain gauges at the center of the span below the sample along the parallel length direction; when using a deflectometer, place the deflectometer at the center of the span and perpendicular to the plane of the sample. 8.5 Test speed The loading rate shall be between 1 mm/min~2 mm/min and kept constant. 8.6 Test Apply the load uniformly across the width of the sample by a loading indenter located at the midpoint of the span until the sample is destroyed or the load drops by 30%. Record the failure load to determine the flexural strength, and record the load-deflection curve or the load-flexural strain curve to determine the flexural modulus. 8.7 Data collection Record the load value of the whole test process, and take the happening of the effective bending damage such as fibre damage or outer metal damage as the principle of data collection. The samples that show interlaminar shear failure, obvious internal defects, or damage beyond the middle one-third of the span shall be discarded. When the number of valid test results in the same batch is less than 5, the number of tested samples shall be increased to ensure the number of valid results reaches 5. 8.8 Failure modes The fibre metal laminate will have the following failure modes under the test of this method. a) Acceptable flexural failure modes: 1) Fibre failure, see Figure 4 a); 2) The outer metal is damaged, see Figure 4 b). b) Unacceptable failure modes: 1) Interlaminar shear failure, see Figure 4 c); Where: —— --- The arithmetic mean of the flexural strength or flexural modulus of the sample, in megapascals (MPa); Xi --- The flexural strength or flexural modulus of the sample, in megapascals (MPa); n --- Number of samples; s --- Standard deviation, in megapascals (MPa). 9.5 Numerical rounding The numerical rounding shall be carried out in accordance with GB/T 8170, the flexural strength is rounded to four significant digits, the standard deviation is rounded to three significant digits, and the flexural modulus is rounded to three significant digits.10 Test reportUnless otherwise agreed by the parties, the test report shall include at least the following information: a) Information on the material category of the sample, including the orientation and specific structure of the sample fibre layup; b) Information on test conditions; c) The number of the document used; d) The model and serial number of the instrument used; e) Fillet radius of the loading indenter and supports; f) Sample source information; g) The unique identification of the sample; h) All information on sample preparation; i) Span; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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