Method for predicting tearing residual strength of fabric membrane material
A strength prediction, fabric membrane technology, applied in the direction of strength characteristics, using stable tension/pressure testing material strength, measuring devices, etc., can solve problems such as low accuracy, improve accuracy, and the method form is concise, clear, and solid. The effect of theoretical basis
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specific Embodiment approach 1
[0023] Specific implementation mode one: as figure 1 As shown, a method for predicting the residual tear strength of a fabric membrane described in this embodiment comprises the following steps:
[0024] Step 1. Establishing a prediction model for the tearing residual strength of the fabric membrane;
[0025] Step 2: Perform a uniaxial center-cut tear test. Prepare a tensile test piece with a central slit, and obtain the remaining tear strength σ of the fabric membrane under different initial slit lengths N ;
[0026] Step 3. The tear residual strength σ obtained in Step 2 N Linear fitting with the initial kerf length to obtain the size of the crack tip damage zone a * ;
[0027] Step 4, the fabric membrane tensile strength item f t and the size of the crack tip damage zone a * Substituting the tearing residual strength prediction model established in step 1 to obtain the evolution curve of the tearing residual strength of the fabric membrane;
[0028] According to the...
specific Embodiment approach 2
[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is that: in the step one, the expression of the fabric membrane material tear residual strength prediction model established is:
[0031]
[0032] Where: σ N is the remaining tear strength of the fabric membrane, f t is the tensile strength item, a e is the equivalent initial kerf length, a * is the size of the crack tip damage zone.
[0033] Among them, a e =Y(ρ) 2 ×a, Y(ρ) is the size correction coefficient of the central notch specimen, and the expression of Y(ρ) is a is half of the initial kerf length 2a of the center kerf, W is half of the tensile specimen width 2W, and the size of the crack tip damage zone K IC It is the fracture toughness, which can be used as a quantitative expression of the tear resistance of fabric membranes.
specific Embodiment approach 3
[0034] Specific implementation mode three: the difference between this implementation mode and specific implementation mode two is: the specific process of said step two is:
[0035] Step 21. Select a non-defective fabric membrane material as the sample to be tested, and use the sample to be tested to make a strip-shaped uniaxial tensile test piece; the size of the test piece is selected uniformly with reference to relevant specifications;
[0036] The size of the effective area of the specimen is 200mm×50mm, such as image 3 shown. Afterwards, use a surgical blade to make a central incision, and the length of the central incision should include 6 types: 0mm, 5mm, 10mm, 15mm, 20mm, and 25mm. In the process of making slits, ensure that the same number of yarns cut per unit length is the same. Each slit size (certain length and width) contains at least 3 samples to eliminate accidental errors. The clamping end L at both ends of the specimen c Each length is 40mm, and it is...
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