梯形法撕破强力试验结果的不稳定性分析

Instability analysis of the results of trapezoidal method tear strength test

为了探究梯形试样的等腰梯形底边长对撕破强力测试结果造成的不稳定性,依据GB/T 3917.3—2009《纺织品织物撕破性能第3部分:梯形试样撕破强力的测定》,试样的等腰梯形底边长分别为104、100、96 mm,对4种不同机织面料进行了测试。结果表明,梯形试样底边长为104 mm时的撕破强力小于底边长为100 mm时的撕破强力,也小于底边长为96 mm时的撕破强力。当底边长偏大时,夹持角度越大,撕破强力结果偏小;底边长偏小,夹持角度越小,撕破强力结果偏大。

To explore the instability of tear force results caused by the isosceles trapezoid bottom edge of trapezoidal specimens,according to GB/T 3917.3—2009 Textile-Tear properties of fabrics-Part 3:Determination of tear force of trapezoidshape test specimens,the isosceles trapezoid bottom edge lengths of specimens are 104,100,and 96 mm respectively,and four different woven fabrics are tested.The results show that the tear force when the bottom edge length of the trapezoidal specimens is 104 mm is lower than that when the bottom edge length of the trapezoidal specimens is 100 mm,and also lower than that when the bottom edge length is 96 mm.When the bottom edge is too long,the clamping angle is larger,and the result of the tear force is smaller.The shorter the bottom edge,the smaller the clamping angle,and the stronger the tear force.