基于材料特性的支片力劲性能表现研究

Analysis on Mechanical Stiffness Performance of Spider Based on Material Properties

将纱织支数为40的Conex4070、Conex4055、NPC4055、Cotton基材含浸酚醛树脂后热压成型,采用Klippel SPM模块测试定心支片的力-位移曲线及刚性曲线,结合理论公式及支片基材的材料特性对试验结果进行分析。研究表明,波美度相同时,支片材质对刚性的影响较大,CX4070支片线性好且具有较大的有效刚度K_(eff),表现出较好的粘弹性特性。随着波美度的增加,CX4070和Cotton支片的K_(eff)降低,且刚性曲线也整体下降;降低Cotton支片的波美度对强度增强的作用有限,对非线性力的增幅低于Conex支片。支片位移相同时,不同基材的支片对应的刚性曲线及波美度差异较大,Cotton材质支片的非线性特征最为明显,其位移在6 mm时的刚性较位移零点增加了82.3%,CX4055支片和CX4070支片的K_(eff)与曲线最低点的刚性值差异较小,CX4055与NPC4055的支片具有较低的共振频率。

Conex4070,Conex4055,NPC4055 and cotton materials with yarn count of 40 were hot pressed and impregnated with phenolic resin.Klippel SPM was used to test the force-displacement and rigidity curves of the spider.The experimental results were analyzed in combination with the theory and materials properties of the spider.The results showed that when the baume degree was the same,the materials of the spider had a great influence on the rigidity.The CX4070 spider had good linearity and high effective stiffness K_(eff),showed good viscoelastic characteristics.The K_(eff)of CX4070 and cotton spider decreased with the increase of baume degree,and the rigidity curve decreased as a whole.The effect of reducing the baume degree of cotton spider on the strength enhancement was limited,and the increase of nonlinear force was lower than that of conex spider.When the displacement of the spider was the same,the rigidity curves and the baume degree of the spider of different materials had great differences.The nonlinear characteristics of the spider made of cotton material are the most obvious.When the displacement was 6 mm,the rigidity of the spider of CX4055 and CX4070 was increased by 82.3%compared with the zero of the displacement.The K_(eff)of CX4055 and CX4070 spider had little difference from the rigidity value of the lowest point of the curve,and the spider of CX4055 and NPC4055 had a lower resonance frequency.