Lyocell短纤维增强气压砂轮基体的力学性能

Mechanical performance of Lyocell short fiber reinforced pneumatic wheel substrate

为了实现高硬度和高耐磨模具自由曲面的高效光整加工,提出了一种以Lyocell短纤维增强气压砂轮基体的新方法,分析了Lyocell短纤维增强橡胶基复合材料的理论模型及气压砂轮结构模型。利用Instron试验机对复合材料试样进行了拉伸试验,并通过误差分析研究了其强度极限。对比分析了弹性模量的试验数值与理论数值,证明了剪滞模型预测气压砂轮基体弹性模量的准确性。对不同短纤维体积分数的气压砂轮光整加工时的压力变化与形变范围进行了仿真分析,验证了短纤维增强气压砂轮基体的可行性。分析了凸曲面与气压砂轮呈不同角度接触时的受力大小及加工面积,获得了理想的接触角度。通过对高硬度凸曲面的材料去除试验,证明了短纤维增强气压砂轮基体这一设想以及气压砂轮仿真试验的可行性。

In order to achieve efficient finishing processing of the mould free-form surface with high hardness and high abrasion resistance,a new method of Lyocell short fiber reinforced pneumatic wheel substrate was put forward,and the theory model of Lyocell short fiber reinforced rubber composites and the structure model of pneumatic wheel were analyzed.Tensile test of composite samples were carried out by Instron tensile testing machine and the ultimate strength was studied through error analysis.The test values and theoretical values of elastic modulus were contrasted and analyzed,and proved that the shear-lag model can predict the elastic modulus of pneumatic wheel substrate accurately.The pressure changing and the strain range of the pneumatic wheel with different short fiber contents during finishing process were simulated and analyzed,and the feasibility of short fiber reinforced pneumatic wheel substrate was verified.Ideal contact angle was obtained by analyzing the stress level and processing area when convex surface contacts with pneumatic wheel in different angles.The material removal tests of high hardness convex surface show the advisability of the theory of short fiber reinforced pneumatic wheel substrate and the simulation of pneumatic wheel test.