ISO 527-1:2019 download free

05-24-2021 comment

ISO 527-1:2019 download free.Plastics-Determination of tensilepropertles Part 1 General principles.
1 Scope
1.1 ISO 527-1 specifies the general principles for determining the tensile properties of plastics and plastic composites under defined conditions. Several different types of test specimen are defined to suit different types of material which are detailed in subsequent parts of iso 527.
1.2 The methods are used to investigate the tensdebehavlour of the test specimens and for determining the tensile strength, tensile modulus and other aspects olthe tensile stress/strain relationship under the conditions defined.
1.3 The methods are selectively suitable for use with the following materials.
— rigid and semi-rigid moulding, extrusion and cast thermoplastic materials, including filled and reinforced compounds In addition to unfilled types; rigid and semi-rigid thermoplastics sheets and films;
— rigid and semi-rigid thermosetting moulding materials. induding filled and reinforced compounds; rigid and semi-rigid thermosetting sheets, including laminates;
— fibre-reinforced thermosets and thermoplastic composites incorporating unidirectional or non- unidirectional reinforcements, such as mat, woven fabrics, woven rovings, chopped strands. combinatinn and hybrid reinforcement, rovings and milled fibres; sheet made from pre-impregnated materials (prepregs);
— thermotropic liquid crystal polymers.
The methods are not normally suitable for use with rigid celluiar materials, for which ISO 1926 is used.
or for sandwich structures containing cellular materials.
2 Normative references
The following documents are referred to In the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 2602, Statistical interpretation of test results — Estimation of the mean — Confidence interral
ISO 7500-1, MetallIc materials — Calibration and verification of static uniaxial testing machines — PUrt 1:
Tension/compressIon testing machines — Calibration and verlfkation of the force-measuring system
ISO 9513:2012, Metallic materials — Calibration of extensometer systems used in uniaxial testing ISO 16012. Plastics — Determination o/ linear dimensions of test specimens
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
strain at break
strain at the last recorded data point before the stress (16) Is reduced to less than or equal to 10 % of
the strength (162) lithe break occurs prior to yielding
Note 1 to entry: It Is expressed as a dimensionless ratio, or as a percentage (%). Note 2 to entry: See Figure 1. curves (1) and (4).
strain at strength
strain at which the strength (162) ix reached
Note Ito entry: it is expressed as a dimensionless ratio, or as a percentage (%).
nominal strain
representation oF strain (12) calculated from grip dlspbcement and the gripping distance [111) by one olihe methods in 1022
Note ito entry: It is expressed as a dimensionless ratio, or as a percentage (%).
Note 2 to entry: It may be calculated either based on the grip displacement from the beginning olihe Lest or based on the IncreSse of grip displacement beyond the strain at yield, lithe latter Is determined with an extensometer (preferred for multipurpose test specimens).
nominal strain at break
nominal strain at the last recorded data point before the stress (16) is reduced to less than or equal to 10% of the sIre rtgth (16.2) lithe break occurs after yielding
Note ito entry: It is expressed as a dimensionless ratio, or as a percentage (%). Note 2 to entry: See Figure L curves (2) and (3).
nominal strain at strength
nominal strain at which the strength (162) Is reached
Note Ito entry: It is expressed as a dimensionless ratio, or as a percentage (%).
Note 2 to entry: See FigiirL curves (2). (3) and (4).
tensile modulus
modulus of elasticity under tension
slope of the stress/strain curve a(s) in the interval between the two strains r s 0,05 % and r • 0,25 % Note I to entry: It is expressed In megapascals (MPa).
Note 2 to entry: It may be calculated either as the chord modulus or as the slope ad’ a linear least-squares regression line In this Interval (see Figure 1. curve 4).
Note 3 to entry: This definition does not apply to Itlrns.
For the determination of the tensile modulus it Is essential that the strain rate is constant and does not change, for example. due to motion in the grips. This is important especially if wedge action grips are used.
NOTE For the prestress, which can be necessary to obtain correct alignmrnt (see 9.3) and specimen seating and to avoid a toe region at the start of the stress/strain diagram, see 9A.
5.1.4 Force Indicator
The force measurement system shall comply with class I as delined in iso 7500-1.
5.1.5 Strain indicator Extensometers
Contact extensometers shall comply with ISO 9513. class 1. The accuracy of this class shall be attained in the strain range over which measurements are being made. Non-contact extensometers may also be used, provided they meet the same accuracy requirements.
The extensometer shall be capable of determining the change In the gauge length of the test specimen at any time during the test. It Is desirable, but not essential, that the instrument should record this change automatically, The instrument shall be essentially free of Inertia lag at the specified speed of testing,
For the determination of teasile modulus, the instrument shall be capable of measuring the change in the gauge length of the specimen with an accuracy of 1 % of the relevant value or better for all gauge lengths ol 50 mm or higher, corresponding to a requirement of absolute accuracy of ±1 pm for a gauge length of 50 mm and to ±1,5 pm. in case a gauge length of 75 mm is used.
For smaller gauge lengths between 20 mm and 50 mm an absolute accuracy of ±1 pm is sufficient (see Figure 2 and Annex C.)
NOTE Depending on the gauge length used, the accuracy requirement of 1 % translates to different absolute accuracies for the determination of the elongation within the gauge length. The constant absolute accuracy for the measurement of change in gauge length leads to relative accuracies of 2 % for gauge length 5 mm and of 2,5% for gauge length 20mm (see Figure 2).
Poisson’s ratio is indicated as Pb (width direction) or Ph (thickness direction) according to the relevant axis.
liextensometers are used, ft is recommended to determine Poisson’s ratio In a strain range 0,3 % sic (see Annex B). The validity of the evaluation region can be determined from a plot of n vs. (dimension change in transverse direction vs. dimension change In longitudinal direction within the relevant gage section). Poisson’s ratio is determined from the slope of the linear part of this plot.
If strain gauges are used to determine Poisson’s ratio, measurement can also be done in the strain region where the tensile modulus is determined (0,05 %  es 0,25 %).
NOTE Plastics are viscoelastic materials. As tuch, Poisson’s ratio Is dependent on the stress range where Ills determined. Therefore, the width (thickness) as a function of length might not be a straight line.
10,5 StatIstical parameters
Calculate the arithmetic means of the test results and, if required, the standard deviations and the 95% confidence Intervals of the mean values In accordance with the procedure given In ISO 2602.
10.6 SIgnificant figures
Calculate the stresses and the tensile modulus to three significant figures, Calculate the strains and Poisson’s ratio to two significant figures.
11 Precision
See the part of ISO 527 relevant to the material being tested.
12 Test report
The test report shall include the information specified in Items a) to q). Add the word tensile to individual and average properties, see Items ni), n) and o:
a) a reference to the relevant part of ISO 527:
b) all the data necessary for identification of the material tested, including type, source, manufacturer’s code number and history, where these are known:
c) description of the nature and form oithe material in terms of whether it isa product, semi-finished product, test panel or specimen; It should Include the principal dimensions, shape, method of manufacture, succession ollayers and any pretreatment;
d) type of test specimen;
e) method of preparing the test specimens. and any details of the manufacturing method used;
1) lithe material Is in product form or semi-finished product form, the orientation of the specimen in relation to the product or semi-finished product from which It Is cut:
g) number of the test specimen tested.

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