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The mechanism of textile tearing
Tear strength is one of the important test items for textile testing. The drop-weight fabric tearing tester is a testing instrument. In addition, the R&D engineer said that the tearing method is different, and the tearing mechanism is also different. The following is a brief description of the tearing mechanism of various tearing methods, hoping to help each customer. A: The tearing strength of the pendulum method is as shown in the figure below. The two sides marked P are the parts of the sample held by the sample clamp; when the weight falls instantly, the sample will break from the first yarn in the tearing triangle area; until the entire sample is torn. Then, between the first broken longitudinal yarn and the two sets of transverse yarns being cut, a triangular area is formed, which is called the tearing triangle area. B: The principle of tearing strength of the pants-shaped method is the same as the tearing strength of the pendulum method. The difference between the two is that the tearing speed is different; the pendulum is a kind of rapid tearing, while the single tongue is a relatively Tear slowly and evenly. C: The trapezoidal method is torn as shown in the figure below: the sample diagram of the trapezoidal method and the sample clamping diagram It can be seen from the two figures above that the trapezoidal method is completely different from the pendulum and single tongue; if the pendulum method is one of the tearing methods A single yarn is fighting, the single tongue method is that at least two or several yarns are fighting, and the trapezoidal method is that a group of yarns are fighting, and the front and follow-up will be rushed until the sample is completely broken. As shown in the figure below (the tearing mechanism diagram of the trapezoidal method) From the tearing mechanism picture, we can see that the trapezoidal method tearing starts from the first yarn marked with the red line until the nth yarn is not straightened, this group of yarns are all It is resistant to the tensile force from the vertical direction; so the trapezoidal tear is not so much tearing, nor is it more appropriate to say that the tensile strength of part of the yarn is more appropriate. D: Wing-shaped tearing The tearing strength of the wing-shaped method is basically the same as that of the trapezoidal method, but the angle is different; the different angles represent different numbers of yarns involved in resisting the tension, so the trapezoidal method and the wing-shaped method are not the same different types of tests, and the test results cannot be compared with each other. Comparison of various types of tearing results (only plain weave fabrics are used as an example, because other fabrics are affected by the particularity of the tissue structure, and the tearing situation is more complicated. type of data to have a general understanding) Summary: Pendulum method<≈single tongue<double tongue method<wing method<trapezoidal method
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1. ISO 5402-1: Specifies the flexometer method for testing leather flex resistance under repeated bending.
2. ISO 17694: Defines test methods for footwear upper and lining flex resistance, simulating real-world bending stress to assess long-term durability.
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