静载荷作用下金属橡胶失效判据及耐久性试验

发布时间：2019-05-09 05:12

【摘要】：金属橡胶(MR)材料由于其出色的阻尼性能广泛应用在各种减振、隔振、抗冲击结构系统中,掌握其失效判据和准确预测其耐久性是关系到整个系统能否安全可靠工作的重要问题。针对MR构件在静载荷持续作用下的失效判据和耐久性展开了试验研究。结果表明:从结构尺寸变化量和力学性能蜕变量2个方面定义MR的失效判定参数合理可行,通过确定阈值可判定MR是否失效并给定耐久寿命。随保载时间的增加,MR的失效评定参数(结构尺寸变化量和力学性能蜕变量)呈现明显的阶段性变化,能分别反映MR材料内部微观结构及受力状态随持续静载荷的变化。在本试验中,无论保载载荷大小,MR结构在总试验时间未表现出结构尺寸失效。而MR保载载荷的增大会显著削弱其力学性能耐久寿命,导致割线模量蜕变量过大,MR构件表现出力学性能的明显失效。
[Abstract]:Because of its excellent damping properties, metal rubber (MR) materials are widely used in various structural systems of vibration absorption, vibration isolation and impact resistance. Mastering its failure criterion and accurately predicting its durability is an important problem related to the safety and reliability of the whole system. The failure criterion and durability of MR members under continuous static load are studied in this paper. The results show that it is reasonable and feasible to define the failure determination parameters of MR from two aspects of structural size variation and mechanical property metamorphosis. Whether MR fails or not can be determined by determining the threshold value and the durability life can be given. With the increase of the holding time, the failure assessment parameters (structural size change and mechanical performance degradation) of MR show obvious periodic changes, which can reflect the changes of microstructure and mechanical state of MR materials with the continuous static load, respectively. In this experiment, regardless of the load-holding load, the MR structure did not show the structural size failure during the total test time. However, the increase of MR load significantly weakens the durability of mechanical properties, which leads to the excessive transformation of Secant modulus and the obvious failure of mechanical properties of MR components.
【作者单位】：北京航空航天大学能源与动力工程学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金(51475023,51475021) 中央高校基本科研业务费专项资金(YWF-15-NNYDLGCXY-007,YWF-15-NNYDLGCXY-033)~~
【分类号】：TQ336.43;TB535

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