Tensile testing machine stroke is commonly referred to as effective stroke, which refers to the test space that the instrument is allowed to move during the tensile test. The greater the effective stroke, the greater the deformation of the specimen and vice versa. The stroke of the tensile testing machine is an important reference for the test item, because depending on the product characteristics, a small measuring range is basically a waste of money, energy and money, so before buying a tensile testing machine, the itinerary needs a lot of reference.
When carrying out a tensile test, the size of the sample used is used small, but the elongation of the material is generally relatively high, so it is necessary to be equipped with a large stroke traction machine to test the tensile properties of flexible packaging materials, otherwise the operation of the die Device can dieExceed lift limit and cause damage to equipment.
It should be noted that when calculating the strain, we only record the strain between the two marked lines on the sample. The marker lines are printed on the finished pattern or drawn manually (adding the marker lines should not affect the pattern), and what is the distance between the marker lines? There are some differences in the distance specified by different standards, and different sample sizes are often specified for different materials in the same standard, so the distance between the marking lines is also different, but this is conducive to the detection of extensibility very large or very small strains and get accurate test results.
For plastic films, the distance between the marking lines is usually between 25 and 50 mm. Because the deformation and elongationIf the specimen in the tensile test is not only within the marked line, each specimen is subjected to different degrees of tensile deformation between the two clamps. In the standard, the initial distance between the clamps, which corresponds to the marked line distance, is within 80-115mm. If the specimens between the two clamps keep the same strain rate and can accept 500%, the effective stroke of the tensile machine must be 480~690mm, if it is a specimen with strain rate of 1000%, the effective stroke of the tensile machine is at least 800mm
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