1 The accuracy and bias of the tensile test strength and ductility measurement depends on the strict adherence to the specified experimental method and is affected by equipment and data elements, sample preparation and experiments, and measurement errors.
2 The reconsideration of the opposite data is determined by the averaging of the data, the repeatability of the sample preparation, the experimental conditions and the determination of the tensile test parameters.
3 The equipment elements that can affect the experimental consequences include: the rigidity of the tensile testing machine, the damping ability, the inherent frequency and the moving parts; the accuracy of the force pointer and the application of the force in different ranges of the testing machine; the appropriate afterburning speed, Appropriate force makes the centering of the sample, the parallelism of the clamp, the clamping force, the size of the control force, the applicability and calibration of the extensometer, the loss of heat (via fixtures, extensometers or auxiliary installation) and so on.
4 The data elements that can affect the experimental consequences include: representativeness and averaging of experimental data, sample type, sample preparation (external brightness, dimensional accuracy, gauge end transition arc, gauge length taper, bending test) Sample, thread quality, etc.).
5 Some materials are very sensitive to the brightness of the sample surface (see Note 8). It must be ground to the desired brightness, perhaps polished to the correct result.
6 For cast, rolled, forged or other non-processed exterior forms, the experimental results can be affected by the appearance characteristics (see Note 14).
7 Specimens taken from parts or parts of the component, such as connotations or risers, or castings that are independently consumed (for example, ridged test pieces) can have experimental consequences without component or component representation.
8 The size of the sample can affect the experimental results. For cylindrical or rectangular specimens, changing the specimen size generally has little effect on the yield strength and tensile strength, but if modified, it can affect the upper yield strength, elongation and section expansion. The elongation value measured by comparing the different samples with the following formula: L0/(A0)1 / 2 (1) where: L0 = original gauge length of the specimen A0 = original cross-sectional area of ​​the specimen
9 Specimens with a smaller L0/(A0)1 / 2 ratio will generally result in greater elongation and cross-sectional expansion, as is the case with the width or thickness of a rectangular tensile specimen.
10 Adhere to the fixed minimum of the L0/(A0)1 / 2r ratio, but the effect is not significant. The addition and increase of elongation and area expansion can be found due to the addition of the scale of the sample of Figure 8. This depends on the data and experimental conditions.
An allowable 1% taper in the gauge length can result in a decrease in elongation. A 1% taper reduces the elongation by 15%.
12 Changes in strain rate can affect the values ​​of yield strength, tensile strength and elongation, especially for strain sensitivities. Generally, the yield strength and the tensile strength are added as the strain rate is added. Although the influence on the tensile strength is not obvious, the elongation value is generally decreased as the strain rate is added.
13 Brittleness data requires careful preparation of the sample, high-quality surface brightness, large transitional arc at the end of the gauge length, and clamping of large-size threads. Deeper marks or scratches are not allowed as the gauge mark.
14 Experiments with flattened tube products can alter the characteristics of the data. Usually, the unevenness in the flattened area can affect the experimental results.
15 Measurement errors affecting the results of the experiment include: experimental force, extensometer, micrometer, gauge and other calibration of the measurement installation, the chart records the adjustment and zero adjustment of the installation.
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Label: 15 Reasons Affecting Mechanical Tensile Testing Machine
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