大尺寸非标碟簧承载性能仿真分析

A Simulation Analysis of the Load-Bearing Performance of Large-Sized Non-Standard Disc Springs

以某锤击式振打系统中的大尺寸非标碟簧为研究对象,对其在不同载荷作用下的响应特性进行了研究。分别采用理论及仿真模拟方法,对标准碟簧及大尺寸非标碟簧的载荷-变形及载荷-应力状态进行了分析;并采用仿真分析方法,研究了对合状态下重载非标碟簧的响应特征。研究结果表明,对于大变形工况,有限元法能更准确地描述大尺寸非标碟簧的承载性能;大尺寸非标碟簧承受载荷小于额定载荷时,其载荷-变形量呈现线性特征;承受载荷超过额定载荷后,载荷-变形量呈现非线性特征。分析认为,碟簧载荷与变形量的理论计算方法适用于结构的小变形状态,当载荷超过额定载荷时,碟簧的变形较大,小变形的线弹性理论已经不适用于大载荷工况。随着载荷变大,对合状态碟簧接触面的接触状态会发生突变,从面-面接触变成线-面接触,接触状态的改变会造成碟簧局部应力产生变化,影响碟簧的安全使用。

Taking the large-scale non-standard disc springs in a hammer rapping system as the research object,a research has been carried out on its response characteristics under different loads.An analysis has been made of the load deformation and load stress states of standard disc springs and large-sized non-standard disc springs respectively by using theoretical and simulation methods,followed by a study on the response characteristics of heavy-duty non-standard disc springs in the coupled state with simulation analysis methods adopted.The research results show that for large deformation conditions,the finite element method can better accurately describe the load-bearing performance of large-sized non-standard disc springs.When the load of large non-standard disc spring is less than the rated load,its load-deformation is characterized with linear features;when the load exceeds the rated load,the load-deformation is characterized with a nonlinear features.The analysis suggests that the theoretical calculation method for the load and deformation of the disc spring is applicable to the small deformation state of the structure.With the load exceeding the rated load,the deformation of the disc spring tends to be large,and the linear elastic theory for small deformation is no longer applicable to large load conditions.As the load increases,the contact state of the disc spring contact surface in mating state will undergo a sudden change,from surface-to-surface contact to line-to-surface contact.The change in contact state will cause changes in the local stress of the disc spring,thus affecting the safe use of the disc springs.