风动冲击器活塞冲击末速度的有限元研究

Research on the last impacting velocity of the piston of pneumatic DTH hammer by FEM

摘要: 风动冲击器活塞的冲击末速度决定了冲击器的工作性能。本文运用有限元分析软件ANSYS建立了活塞分析的有限元模型,对不同冲击末速度下活塞的应力应变进行了分析研究,得出活塞最大应力随冲击末速度增大而增大,但变化为非线性,设计和使用中应严格控制冲击末速度的结论。

Abstract: Last impacting velocity of the piston of pneumatic DHT hammer contacts nearly capability of pneumatic DHT hammer.FEM model of the piston is set up with FEM software ANSYS.Under different last impacting velocity,the stress and strain of the piston are analyzed.The conclusion is presented such as the stress of the piston increases with the increase of the last impacting velocity,but the change is nonlinear,and the last impacting velocity should be limited strictly.